U301A
Control Module Wake-up Circuit A/Open
U301A is an OBD-II diagnostic trouble code meaning: Control Module Wake-up Circuit A/Open. Common causes: broken or damaged wires in the wake-up circuit, oxidized or bad contacts in connectors. Estimated repair cost: $6–56.
Symptoms
- The car won't start
- Intermittent problems starting the engine
- The Check Engine light is on on the dashboard
- Lost connection with diagnostic equipment
- Failure of individual vehicle systems
Causes
- Broken or damaged wires in the wake-up circuit
- Oxidized or bad contacts in connectors
- Faulty wake-up relay or fuse
- Problems with control unit (module) A
- Short circuit in the electrical circuit
How to Fix
- Check the integrity of the fuses and relays of the wake-up circuit
- Inspect the wiring harness for damage or breaks.
- Check and clean the contacts in the wake-up circuit connectors
- Test control unit (module) A
- Check the resistance and continuity of the wake-up circuit
Related codes
Error U301A by Vehicle Brand
FAQ
What does the U301A code mean?
U301A is an OBD-II diagnostic trouble code that indicates: Control Module Wake-up Circuit A/Open
What causes a U301A error code?
The most common causes of U301A include: Broken or damaged wires in the wake-up circuit; Oxidized or bad contacts in connectors; Faulty wake-up relay or fuse; Problems with control unit (module) A.
How do I fix a U301A diagnostic trouble code?
To fix U301A: Check the integrity of the fuses and relays of the wake-up circuit. Inspect the wiring harness for damage or breaks.. Check and clean the contacts in the wake-up circuit connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U301A?
Do not drive — repair immediately
How much does it cost to fix U301A?
The estimated repair cost for U301A is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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