P1A77
Starter/Generator Control Module Coolant Temperature Sensor 2 Circuit High Voltage
P1A77 is an OBD-II diagnostic trouble code meaning: Starter/Generator Control Module Coolant Temperature Sensor 2 Circuit High Voltage. Common causes: malfunction of coolant temperature sensor no. 2, open or damaged sensor circuit. Estimated repair cost: $17–78.
Symptoms
- Check Engine Light Is On
- Reduced efficiency of the regenerative braking system
- Problems starting the engine
- Decreased hybrid battery charge
- System transition to emergency operation mode
Causes
- Malfunction of coolant temperature sensor No. 2
- Open or damaged sensor circuit
- Short circuit in the sensor circuit
- Corrosion of electrical contacts
- Starter/Generator Control Module Malfunction
How to Fix
- Check the temperature sensor readings with a scanner
- Inspect the sensor wiring harness and connectors for damage.
- Check the integrity of the sensor circuit
- Measure the resistance of the temperature sensor
- If necessary, replace the coolant temperature sensor
Related codes
FAQ
What does the P1A77 code mean?
P1A77 is an OBD-II diagnostic trouble code that indicates: Starter/Generator Control Module Coolant Temperature Sensor 2 Circuit High Voltage
What causes a P1A77 error code?
The most common causes of P1A77 include: Malfunction of coolant temperature sensor No. 2; Open or damaged sensor circuit; Short circuit in the sensor circuit; Corrosion of electrical contacts.
How do I fix a P1A77 diagnostic trouble code?
To fix P1A77: Check the temperature sensor readings with a scanner. Inspect the sensor wiring harness and connectors for damage.. Check the integrity of the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1A77?
Yes, but get it checked soon
How much does it cost to fix P1A77?
The estimated repair cost for P1A77 is $17–78. Actual cost depends on your vehicle, location, and labor rates.
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