U3023

Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–167 (est.)

Symptoms

Problems starting the engine
Spontaneous shutdown of electronics
Check Engine Light Is On
Malfunctions of various vehicle systems
Lost connection with diagnostic equipment

Causes

Damage to the power wiring harness
Faulty ignition relay
Corrosion or poor contact in connectors
Fuse problems
Malfunction of the control module itself

How to Fix

Check the condition of the power circuit fuses
Inspect the wiring harness for damage
Check the contacts in the control module connectors
Test the ignition relay
Diagnose the control module on the stand

Related codes

U3000 U3001 U3022