U3019

Control Module Input Power Circuit B/C Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–111 (est.)

Symptoms

Unstable engine operation
Periodic failures in the operation of electronic systems
Malfunction indicator light comes on
Problems starting the engine

Causes

Poor contact in ECU connectors
Corroded or damaged wires
Control unit malfunction
Alternator or battery problems

How to Fix

Check connections and connectors of the ECU
Inspect the wiring harness for damage
Check voltage in power supply circuits B and C
Test the generator and battery
If necessary, replace the ECU

Related codes

U3000 U3003 U3020