Transmission control unit
NOTE: If a unit or component is likely to fail and the vehicle is still under manufacturer's warranty, refer to the warranty manual before replacing the component (section B1.2) or determine if there is any previously approved special program in operation.
NOTE: Universal Scan Tools may not read the listed codes or may only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the 7-digit code listed to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).
NOTE: Always use a digital multimeter when performing voltage or resistance tests (DMM) accurate to three decimal places and with a valid calibration certificate. When testing resistance, be sure to consider the resistance of the DMM leads.
NOTE: Before starting diagnostic programs using troubleshooting tests, check and correct major problems.
NOTE: Inspect the connectors for signs of water intrusion and their pins for damage and (or) traces of corrosion.
NOTE: If DTCs are logged and there is no problem after performing troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded contacts.
Description and operation
A detailed description of the transmission control system is contained in the corresponding section «Description and operation» repair manuals. For more information, please refer to the chapter: Description of the gearbox (307-01 Automatic transmission / transaxle transmission, description and principle of operation).
DTC | Description | Possible reason | Action |
P0218-68 | Overheating of the transmission fluid | Check the level and condition of the transmission fluid. Check transmission fluid cooler/hoses for blockage/damage/clogging. Correct if necessary. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0500-00 | Vehicle speed sensor "A" (output speed sensor) | Check sensor "A" the speed of the car and its circuit. See wiring diagrams. Correct if necessary. | |
P056-100 | Unstable voltage in the system | Check the battery and charging system. See wiring diagrams. Correct if necessary. | |
P0562-00 | Low voltage in the system | Check the battery and charging system. See wiring diagrams. Correct if necessary. | |
P0601-00 | Control unit memory internal checksum error | Internal malfunction of the transmission control unit (TCM) | Reconfigure the unit using an approved diagnostic system. |
P0603-00 | Internal error in the non-volatile memory of the control unit (KAM) | Internal malfunction of the transmission control unit (TCM) | If a TCM failure is suspected, refer to the warranty policy and procedures manual. |
P0604-00 | Direct access memory error (RAM) internal control unit | Internal malfunction of the transmission control unit (TCM) | If a TCM failure is suspected, refer to the warranty policy and procedures manual. |
P0605-00 | Read Only Memory Error (ROM) internal control unit | Internal malfunction of the transmission control unit (TCM) | If a TCM failure is suspected, refer to the warranty policy and procedures manual. |
P0614-00 | Engine control unit incompatibility (ECM) / transmission control unit (TCM) | Inappropriate software in TCM | Reconfigure the unit using an approved diagnostic system. |
P062F-00 | Electrically Erasable Programmable Read Only Memory Internal Error (EEPROM) control unit. | Internal malfunction of the transmission control unit (TCM) | If a TCM failure is suspected, refer to the warranty policy and procedures manual. |
P0705-00 | Sensor circuit "A" transmission modes (PRNDL input) | Check the adjustment of the selector cable and the corresponding sensor. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0706-00 | Sensor circuit range/parameters "A" transmission modes | Check selector cable adjustment. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). Calibrate the gear shift sensor using an approved diagnostic system. If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0709-00 | Sensor "A" transmission modes: voltage ripple in the circuit. | Check selector cable adjustment. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). Calibrate the gear shift sensor using an approved diagnostic system. If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0711-00 | Sensor circuit range/parameters "A" transmission fluid temperature. | Check the transmission fluid temperature sensor and related circuits. See wiring diagrams. Correct if necessary. | |
P0712-00 | Low voltage in the sensor circuit "A" transmission fluid temperature | Check the transmission fluid temperature sensor and related circuits. See wiring diagrams. Correct if necessary. | |
P0713-00 | High voltage in the sensor circuit "A" transmission fluid temperature | Transmission Oil Temperature Sensor Circuit Short to Power | Check the transmission fluid temperature sensor and related circuits. See wiring diagrams. Correct if necessary. |
P0715-00 | Sensor circuit "A" turbine / input shaft speed (ISS) | Transmission Input Shaft Circuit Short to Power | Check the transmission input shaft speed sensor and its circuits. See wiring diagrams. Install a new ISS sensor if necessary. For more information, see the chapter: (307-01 Automatic transmission / transaxle). Input Shaft Speed Sensor (ISS) - 3.2L NA - I6 (Removal and installation), Input shaft speed sensor (ISS) - 2.2L Duratorq - Td4 (Removal and installation). |
P0716-00 | Sensor circuit range/performance "A" turbine / input shaft speed (ISS) | Check the transmission input shaft speed sensor and its circuits. See wiring diagrams. Install a new ISS sensor if necessary. For more information, see the chapter: (307-01 Automatic transmission / transaxle). Input Shaft Speed Sensor (ISS) - 3.2L NA - I6 (Removal and installation), Input shaft speed sensor (ISS) - 2.2L Duratorq - Td4 (Removal and installation). | |
P0718-00 | Sensor circuit "A" turbine / input shaft speed (ISS): voltage ripple | Check the transmission input shaft speed sensor and its circuits. See wiring diagrams. Install a new ISS sensor if necessary. For more information, see the chapter: (307-01 Automatic transmission / transaxle). Input Shaft Speed Sensor (ISS) - 3.2L NA - I6 (Removal and installation), Input shaft speed sensor (ISS) - 2.2L Duratorq - Td4 (Removal and installation). | |
P0720-00 | Output shaft speed sensor circuit (OSS) (sensor circuit "A" vehicle speed) | OSS Sensor Circuit Short to Power | Check transmission OSS sensor and circuits. See wiring diagrams. Correct if necessary. |
P0721-00 | Range / parameters of the output shaft speed sensor (OSS) (sensor circuit "A" vehicle speed) | Make sure the wheels and tires are the correct size. Check the correct installation of the gearbox OSS sensor. Check the OSS sensor and its circuits. See wiring diagrams. Correct if necessary. | |
P0722-00 | Output shaft speed sensor circuit (OSS) (sensor circuit "A" vehicle speed): no signal | Check transmission OSS sensor and circuits. See wiring diagrams. Correct if necessary. If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0723-00 | Output shaft speed sensor circuit (OSS) (sensor circuit "A" vehicle speed): intermittent operation | Check the correct installation of the gearbox OSS sensor. Check the OSS sensor and its circuits. See wiring diagrams. Correct if necessary. If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0725-00 | Engine speed input circuit | Perform a complete read of DTCs related to the vehicle's CAN network. Correct if necessary. | |
P0729-00 | Incorrect 6th gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0730-00 | Wrong gear ratio | Transmission internal fault | If transmission failure is likely, refer to the warranty policy and procedures manual. |
P0730-95 | Wrong gear ratio: wrong assembly | Wrong final drive fitted | Check the part numbers of the gearbox assemblies. If transmission failure is likely, refer to the warranty policy and procedures manual. |
P0731-00 | Incorrect 1st gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0732-00 | Incorrect 2nd gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0733-00 | Incorrect 3rd gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0734-00 | Incorrect 4th gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0735-00 | Incorrect 5th gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0736-00 | Incorrect reverse gear ratio | Completely read all relevant engine torque DTCs. Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P073D-00 | Can't turn on neutral | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P073E-64 | Can't turn on reverse | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P073F-00 | Unable to engage 1st gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0741-00 | Torque Converter Clutch Solenoid Circuit Performance/Stuck Off | If transmission or TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0742-00 | Torque Converter Clutch Solenoid Circuit Stuck On | If transmission or TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P0744-68 | Torque converter clutch solenoid circuit voltage ripple | Completely read all DTCs related to the engine. Correct if necessary. | |
P074A-00 | Unable to engage 2nd gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P074B-00 | Unable to engage 3rd gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P074C-00 | Unable to engage 4th gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P074D-00 | Unable to engage 5th gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P074E-00 | Unable to engage 6th gear | Check the level and condition of the transmission fluid. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0777-00 | Pressure control solenoid "IN": stuck in on position | Shift Solenoid #2 Stuck On | If transmission failure is likely, refer to the warranty policy and procedures manual. |
P0814-42 | Transmission Range Display Circuit General Memory Fault | Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
P0814-49 | Transmission Range Display Circuit - Internal Electronics Malfunction | Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
P081711 | Starter disable circuit/open circuit | Check the starter disable circuits. See wiring diagrams. Correct if necessary. | |
P0817-12 | Starter disable circuit/open circuit | Start inhibit output control circuit short circuit to power | Check the starter disable circuits. See wiring diagrams. Correct if necessary. |
P081C-49 | Parking brake input circuit - internal electronics fault | Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
P0826-01 | Switch circuit "up down" | Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
P085A-00 | Block connection circuit "IN" gear shift | Local communication circuit failure (LIN) between gearbox selector block (GSM) and gearbox control unit (TCM) | Check the electrical circuits of the local area network of interaction (LIN) See wiring diagrams. Correct if necessary. |
P0860-11 | Block connection circuit "A" gear shift | Local communication circuit failure (LIN) between gearbox selector block (GSM) and gearbox control unit (TCM) | Check the electrical circuits of the local area network of interaction (LIN) See wiring diagrams. Correct if necessary. |
P0860-12 | Block connection circuit "A" gear shift | Local communication circuit failure (LIN) between gearbox selector block (GSM) and gearbox control unit (TCM) | Check the electrical circuits of the local area network of interaction (LIN) See wiring diagrams. Correct if necessary. |
P0860-13 | Block connection circuit "A" gear shift | Local communication circuit failure (LIN) between gearbox selector block (GSM) and gearbox control unit (TCM) | Check the electrical circuits of the local area network of interaction (LIN) See wiring diagrams. Correct if necessary. |
P0860-87 | Block connection circuit "A" gear shift: missing message | Local communication circuit failure (LIN) between gearbox selector block (GSM) and gearbox control unit (TCM) | Check the electrical circuits of the local area network of interaction (LIN) See wiring diagrams. Correct if necessary. |
P088513 | Transmission Control Module Power Relay Control Circuit (TCM): open circuit | Check the TCM relay and circuits. See wiring diagrams. Correct if necessary. | |
P0886-11 | Transmission Control Module Power Relay Control Circuit (TCM): circuit low voltage | Check the TCM relay and circuits. See wiring diagrams. Correct if necessary. | |
P0894-68 | Gearbox component slip | Read all relevant DTCs in their entirety. Correct if necessary. Check the level and condition of the transmission fluid. Correct if necessary. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0895-00 | Switching time too short | If transmission or unit failure is likely, refer to the warranty policy and procedures manual. | |
P0896-00 | Switching time too long | If transmission or unit failure is likely, refer to the warranty policy and procedures manual. | |
P0897-09 | Loss of transmission fluid properties | Transmission fluid not serviceable | Drain the gearbox oil and refill with clean oil. For more information, see the chapter: (307-01 Automatic transmission / transaxle). Draining and refilling transmission fluid - 3.2L NA - I6 (General procedures), Draining and refilling transmission fluid - 2.2L Duratorq - Td4 (General procedures). |
P0928-13 | Shift Lock Solenoid Circuit Open | Check the shift interlock solenoid and circuits. See wiring diagrams. Correct if necessary. | |
P0930-11 | Shift Interlock Solenoid Circuit Low Circuit Voltage | Check the shift interlock solenoid and circuits. See wiring diagrams. Correct if necessary. | |
P0931-12 | Shift Interlock Solenoid Circuit High Circuit Voltage | Check the shift interlock solenoid and circuits. See wiring diagrams. Correct if necessary. | |
P0960-00 | Solenoid control circuit "A" pressure regulation: open circuit | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0961-00 | Solenoid control circuit "A" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0963-00 | Solenoid control circuit "A" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0964-00 | Solenoid control circuit "B" pressure regulation: open circuit | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0965-00 | Solenoid control circuit "IN" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0967-00 | Solenoid control circuit "B" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0969-00 | Solenoid control circuit "WITH" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0970-00 | Solenoid control circuit "C" pressure control circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0971-00 | Solenoid control circuit "C" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0973-00 | Solenoid control circuit "A" gearshift circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0974-00 | Solenoid control circuit "A" gearshift circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0976-00 | Solenoid control circuit "IN" gearshift circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P0977-00 | Solenoid control circuit "IN" gearshift circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P1783-68 | Transmission overheating | Check the level and condition of the transmission fluid. Check transmission fluid cooler/hoses for blockage/damage/clogging. Correct if necessary. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P1799-00 | Controller LAN Bus Circuit Malfunction (CAN) transmission control unit (CAN) /anti-lock brakes (ABS) | Check the CAN bus circuits. See wiring diagrams. Correct if necessary. If there is a suspicion of failure of the ABS unit (BCM), refer to the warranty policy and procedures manual. | |
P2158-00 | Vehicle speed sensor "IN" (input shaft speed (ISS)) | Check the ISS sensor and its circuits. See wiring diagrams. Install a new ISS sensor if necessary. For more information, refer to the chapter: Input shaft speed sensor (ISS) - 3.2L NA - I6 (307-01 Automatic transmission / transaxle, Removal and installation) / Input shaft speed sensor (ISS) - 2.2L Duratorq - Td4 (307-01 Automatic transmission / transaxle, Removal and installation). | |
P2719-00 | Solenoid control circuit "D" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2720-00 | Solenoid control circuit "D" pressure control circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2721-00 | Solenoid control circuit "D" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2728-00 | Solenoid control circuit "E" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2729-00 | Solenoid control circuit "E" pressure control circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2730-00 | Solenoid control circuit "E" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2733-00 | Pressure control solenoid "F": stuck on position | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2737-00 | Solenoid control circuit "F" pressure regulation: range/circuit parameters | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2738-00 | Solenoid control circuit "F" pressure control circuit low voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2739-00 | Solenoid control circuit "F" pressure control circuit high voltage | If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2783-68 | Torque converter overheating | Check the level and condition of the transmission fluid. Check transmission fluid cooler/hoses for blockage/damage/clogging. Correct if necessary. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2787-68 | Clutch temperature too high | Check the level and condition of the transmission fluid. Check transmission fluid cooler/hoses for blockage/damage/clogging. Correct if necessary. If transmission failure is likely, refer to the warranty policy and procedures manual. | |
P2800-00 | Circuit In the sensor of modes of a transmission (PRNDL input) | Check if the gear selector lever cable is properly adjusted. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P2801-00 | Sensor "IN" transmission modes: range / circuit parameters | Check if the gear selector lever cable is properly adjusted. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
P2805-00 | A/B sensor ratio of transmission modes | Check if the gear selector lever cable is properly adjusted. For more information, refer to the chapter: Gear selector cable adjustment (307-05 External controls for automatic transmission/transaxle transaxle, General Procedures). If a TCM failure is suspected, refer to the warranty policy and procedures manual. | |
U0001-00 | High speed controller LAN communication bus (CAN) | Perform a full read of the vehicle's DTCs indicating a CAN or ECU failure. Correct if necessary. Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
U0100-00 | Loss of communication with the ECM "A" | Perform a full read of the vehicle's DTCs indicating a CAN or ECU failure. Correct if necessary. Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
U0121-00 | Controller LAN Bus Circuit Malfunction (CAN) transmission control unit (CAN) /anti-lock brakes (ABS): no connection | Perform a full read of the vehicle's DTCs indicating a CAN or ECU failure. Correct if necessary. Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
U0300-00 | Internal control unit software incompatibility | Make sure the modules match the vehicle and that the correct software version is installed. Reconfigure the CAN system using an approved diagnostic system. | |
U0401-00 | Invalid data received from the engine control unit (ECM) | Wrong signal from ECM | Perform a full read of vehicle diagnostic trouble codes indicating a controller LAN bus failure (CAN) or the ECM. Correct if necessary. Refer to the warranty policy and procedures manual if an engine control module failure is suspected. |
U0415-00 | From the anti-lock brake system control unit (ABS) invalid data received | Reprogram blocks if necessary. Refer to the warranty policy and procedures manual if a unit failure is suspected. | |
U2100-00 | Primary configuration not configured | Check for other DTCs related to controller LAN problems (CAN) or allegedly unrelated to customer complaints. Perform a complete read of vehicle DTCs. Check the CAN bus circuits. See wiring diagrams. Correct if necessary. Clear DTCs and check for correct operation. Check if the correct version of the vehicle configuration software is installed in the central unit. Reprogram the block if necessary. | |
U2101-00 | Control unit configuration incompatibility | Missing or corrupted central unit configuration parameter | Check if the correct version of the vehicle configuration software is installed in the central unit. Reprogram the block if necessary. |
U2023-00 | Engine torque signal | Read all relevant DTCs in their entirety. Correct if necessary. Check the CAN bus circuits. See wiring diagrams. Correct if necessary. | |
U2105-11 | Signal "A" switch block | Check GSM and electrical circuits. See wiring diagrams. Correct if necessary. If a GSM failure is suspected, refer to the warranty policy and procedures manual. | |
U2105-12 | Signal "A" switch block | Check GSM and electrical circuits. See wiring diagrams. Correct if necessary. If a GSM failure is suspected, refer to the warranty policy and procedures manual. | |
U3003-62 | Battery voltage | Voltage mismatch between battery and transmission control unit (TCM): more than 2V difference | Check the TCM power circuit. See wiring diagrams. Correct if necessary. |
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