P138A
Glow Plug Control Module Control Circuit Range/Performance
P138A is an OBD-II diagnostic trouble code meaning: Glow Plug Control Module Control Circuit Range/Performance. Common causes: malfunction of the glow plug control module, broken or damaged wires in the control circuit. Estimated repair cost: $17–89.
Symptoms
- Difficulty starting the engine in cold weather
- Check Engine Light Is On
- Increased exhaust smoke during cold start
- Reduced engine power
- Rough engine idling
Causes
- Malfunction of the glow plug control module
- Broken or damaged wires in the control circuit
- Poor contacts in circuit connectors
- Problems with the glow plug relay
- Malfunction of the ECU itself
How to Fix
- Check the integrity of the glow plug control circuit
- Inspect and clean the contacts in the module connectors
- Check the functionality of the spark plug control module
- Check the glow plug relay for malfunctions
- If necessary, replace the glow plug control module
Related codes
FAQ
What does the P138A code mean?
P138A is an OBD-II diagnostic trouble code that indicates: Glow Plug Control Module Control Circuit Range/Performance
What causes a P138A error code?
The most common causes of P138A include: Malfunction of the glow plug control module; Broken or damaged wires in the control circuit; Poor contacts in circuit connectors; Problems with the glow plug relay.
How do I fix a P138A diagnostic trouble code?
To fix P138A: Check the integrity of the glow plug control circuit. Inspect and clean the contacts in the module connectors. Check the functionality of the spark plug control module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P138A?
Yes, but get it checked soon
How much does it cost to fix P138A?
The estimated repair cost for P138A is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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