Auxiliary Cooling Coolant Temperature Sensor A Circuit High
The ECM detects a high fault on the auxiliary cooling coolant temperature sensor a circuit. Reading cannot be used reliably for control.
Affected components
- Aux cooling coolant temp sensor a
- Wiring harness
Common causes
- High likelihood: Signal wire shorted to B+
- Medium likelihood: Open sensor
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
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.