U3023
Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation
Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation: the value does not correlate with the related sensor or expected pattern.
Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation: the value does not correlate with the related sensor or expected pattern.
Common causes
- high
Wiring or relay fault between supply and ignition path
One of the most commonly reported causes for this code — check this first.
Typical part cost: $60-550
- low
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
Typical part cost: $60-550
See all causes + fix costs
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does U3023 mean?
U3023 means "Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U3023?
wiring or relay fault between supply and ignition path; gateway module routing can messages incorrectly; can terminating resistor (120 ω) drifted out of spec — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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