U3018
Control Module Input Power Circuit A/B Correlation
U3018 is an OBD-II diagnostic trouble code meaning: Control Module Input Power Circuit A/B Correlation. Common causes: poor contact in the control unit connectors, open or short circuit in wiring harness. Estimated repair cost: $6–167.
Symptoms
- Unstable engine operation
- Intermittent failures of electronic systems
- Check Engine light comes on
- Problems starting the engine
Causes
- Poor contact in the control unit connectors
- Open or short circuit in wiring harness
- Faulty relays or fuses
- Alternator or battery problems
- Malfunction of the control unit itself
How to Fix
- Check the condition of the battery and generator
- Inspect the wiring harness and connectors of the control unit
- Check relays and fuses of relevant circuits
- Measure voltages on power circuits A and B
- If necessary, replace the control unit
Related codes
Error U3018 by Vehicle Brand
FAQ
What does the U3018 code mean?
U3018 is an OBD-II diagnostic trouble code that indicates: Control Module Input Power Circuit A/B Correlation
What causes a U3018 error code?
The most common causes of U3018 include: Poor contact in the control unit connectors; Open or short circuit in wiring harness; Faulty relays or fuses; Alternator or battery problems.
How do I fix a U3018 diagnostic trouble code?
To fix U3018: Check the condition of the battery and generator. Inspect the wiring harness and connectors of the control unit. Check relays and fuses of relevant circuits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U3018?
Yes, but get it checked soon
How much does it cost to fix U3018?
The estimated repair cost for U3018 is $6–167. Actual cost depends on your vehicle, location, and labor rates.
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