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: Inspect the electrical connectors for signs of water intrusion and their pins for damage and/or corrosion.
NOTE: If DTCs are logged and there is no problem after performing Pinpoint tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded contacts.
DTC | Description | Possible reason | Action |
P038000 | Glow Plug/Heater Circuit A | Glow Plug System Malfunction - Glow Plug Malfunction, Relay Malfunction, Glow Plug Shorted or Over Current | Perform the Pinpoint tests associated with this DTC using the manufacturer's approved diagnostic system. |
P038300 | Glow Plug Control Module Control Circuit Low Voltage | Glow plug relay control circuit - short to ground | Refer to electrical circuit diagrams and check glow plug relay circuit for short to ground |
P038400 | High voltage in the control circuit of the glow plug control module | Glow Plug Relay Control Circuit Short to Battery | Refer to electrical circuit diagrams and check glow plug relay circuit for short to battery |
P138A00 | Glow Plug Control Module Electrical Range/Performance Problems | High temperature glow plug relay | Perform the Pinpoint tests associated with this DTC using the manufacturer's approved diagnostic system. |
P138B00 | Glow Plug Control Module System Voltage | Glow Plug System Malfunction - Glow Plug Shorted, Over Current, or Relay Stuck | Perform the Pinpoint tests associated with this DTC using the manufacturer's approved diagnostic system. |
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