P1A78
Starter/Generator Control Module Coolant Temperature Sensor 3 Performance
P1A78 is an OBD-II diagnostic trouble code meaning: Starter/Generator Control Module Coolant Temperature Sensor 3 Performance. Common causes: coolant temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.
Symptoms
- Check Engine light comes on
- Problems starting the engine
- Reduced hybrid system efficiency (if applicable)
- Unstable engine operation
- Increased fuel consumption
Causes
- Coolant temperature sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Starter/Generator Control Module Malfunction
- Wiring Harness Problems
How to Fix
- Check the condition of the coolant temperature sensor
- Check the integrity of the sensor circuit and connection
- Check connectors and contacts for corrosion or damage
- Replace the faulty coolant temperature sensor
- If necessary, replace the starter/generator control module
Related codes
FAQ
What does the P1A78 code mean?
P1A78 is an OBD-II diagnostic trouble code that indicates: Starter/Generator Control Module Coolant Temperature Sensor 3 Performance
What causes a P1A78 error code?
The most common causes of P1A78 include: Coolant temperature sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Starter/Generator Control Module Malfunction.
How do I fix a P1A78 diagnostic trouble code?
To fix P1A78: Check the condition of the coolant temperature sensor. Check the integrity of the sensor circuit and connection. Check connectors and contacts for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1A78?
Yes, but get it checked soon
How much does it cost to fix P1A78?
The estimated repair cost for P1A78 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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