U040C
Invalid Data Received From Exhaust Gas Recirculation Control Module B
A receiving module detected implausible data from EGR control module B. Valve position, flow or temperature values fail plausibility checks against other inputs and are rejected.
A receiving module detected implausible data from EGR control module B. Valve position, flow or temperature values fail plausibility checks against other inputs and are rejected.
Common causes
- high
Module internal fault or sensor input drift
One of the most commonly reported causes for this code — check this first.
Typical part cost: $130-1650
- medium
Software version mismatch after replacement
A plausible cause — test and verify before replacing parts.
Typical part cost: $130-1650
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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 U040C mean?
U040C means "Invalid Data Received From Exhaust Gas Recirculation Control Module B". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U040C?
module internal fault or sensor input drift; software version mismatch after replacement; gateway module routing can messages incorrectly — 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?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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