Stack Inlet Coolant Temperature Sensor Circuit
Generic fault on the coolant temperature sensor at the fuel cell stack inlet (deionized coolant cools the membrane electrode assemblies).
Affected components
- Stack inlet coolant temp sensor
- Sensor wiring
Common causes
- High likelihood: Sensor failed
- Low likelihood: Gateway module routing CAN messages incorrectly
- Low likelihood: CAN terminating resistor (120 Ω) drifted out of spec
Possible symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Diagnostic notes
- The malfunction indicator lamp may illuminate
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.