NOTE: If a control module or component is suspected and the vehicle continues to be covered by the manufacturer's warranty, refer to the warranty manual before installing a new module/component (subsection B1.2), or determine if there is any previously approved special program in operation.
NOTE: Universal Scan Tools cannot read the listed codes or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7 digit code 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 modern calibration certificate. When testing resistance, always consider the resistance of the DMM wires.
NOTE: Before starting diagnostic programs using Pinpoint tests, check and correct basic problems.
NOTE: If DTCs are logged and there is no problem after performing Pinpoint tests, an intermittent problem may be the cause. Always check for loose connections and corroded contacts.
| DTC | Description | Possible reason | Action |
| P056200 | Low voltage in the system | Battery voltage below lower limit | Perform the pinpoint test associated with this DTC using the manufacturer's approved diagnostic system. |
| P056300 | High voltage in the system | Battery voltage over upper limit | Perform the pinpoint test associated with this DTC using the manufacturer's approved diagnostic system. Check the integrity of the charging system. For more information refer to: Generator (414-02 Generator and voltage regulator, Diagnostics and checks). |
| P062000 | Generator control circuit | Loss of communication with the generator | Refer to the electrical diagrams and check the LIN circuit from the alternator to the ECM |
| P063A00 | Generator voltage sensing circuit | Generator electrical failure | Refer to electrical diagrams and check battery positive connection to alternator. Check the integrity of the drive pulley and belt. Check the battery voltage in KOEO and KOER mode, if the voltage does not get higher with the engine running, install a new alternator |
| P065A00 | Generator System Specifications | Overheating of the generator regulator | Refer to electrical diagrams and check battery positive connection to alternator. Check the alternator regulator housing. Check the integrity of the drive pulley and belt. Check for additional DTCs and refer to the appropriate DTC Index. Check the battery voltage in KOEO and KOER mode, if the voltage does not get higher with the engine running, install a new alternator |
| P065B00 | Generator control circuit range/characteristics | Refer to the electrical diagrams and check the LIN electrical circuit from the ECM to the alternator. Check/install a new alternator if necessary | |
| P065C00 | Mechanical characteristics of the generator | Generator mechanical failure | Refer to electrical diagrams and check battery positive connection to alternator. Check the integrity of the drive pulley and belt. Check the battery voltage in KOEO and KOER mode, if the voltage does not get higher with the engine running, install a new alternator |
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