U3018

Control Module Input Power Circuit A/B Correlation

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–167 (est.)

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

U3000 U3001 U3017