NOTE: If a control module or component is suspected and the vehicle remains under manufacturer's warranty, refer to the warranty manual (subsection B1.2) before installing a new module/component, or determine if there is a previously approved special program in effect.
NOTE: Generic scan tools cannot read the codes listed 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 fault (the last 2 digits provide additional information readable by the manufacturer-approved diagnostic system).
NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) with three decimal places of accuracy and a current calibration certificate. When testing resistance, always include the resistance of the DMM leads.
NOTE: Before starting diagnostic programs using Pinpoint tests, check and eliminate basic faults.
NOTE: Inspect electrical connectors for signs of water intrusion and connector posts for damage and/or corrosion.
NOTE: If DTCs are logged and the fault is not present after performing the Pinpoint tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded terminals.
| DTC | Description | Possible reason | Action |
| P038000 | Electrical circuit A glow plugs/heater | Glow Plug System Malfunction - Glow Plug Malfunction, Relay Malfunction, Glow Plug Short or Over Current | Perform the Pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. |
| P038300 | Low Voltage in Glow Plug Control Module Control Circuit | Glow Plug Relay Control Circuit Short to Ground | Refer to the electrical diagrams and check the glow plug relay circuit for a short to ground |
| P038400 | High Voltage in Glow Plug Control Module Control Circuit | Glow Plug Relay Control Circuit - Short to Battery + | Refer to the electrical diagrams and check the glow plug relay circuit for a short to battery + |
| P138A00 | Glow Plug Control Module Control Circuit Range/Performance Problem | Increased glow plug relay temperature | Perform the Pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. |
| P138B00 | Glow Plug Control Module System Voltage | Malfunction of the glow plug system - short circuit in the glow plug, excess current or jamming in the relay | Perform the Pinpoint tests associated with this DTC using the manufacturer approved diagnostic system. |
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