U355C
Charge Air Cooler Outlet Temperature Sensor Circuit
Generic fault on the charge air cooler outlet temperature sensor in the FCEV cathode supply path. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Generic fault on the charge air cooler outlet temperature sensor in the FCEV cathode supply path. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Common causes
- high
Sensor failed
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-1650
- low
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
Typical part cost: $220-1650
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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 U355C mean?
U355C means "Charge Air Cooler Outlet Temperature Sensor Circuit". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U355C?
sensor failed; 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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