P2E78
Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Intermittent/Erratic
P2E78 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Intermittent/Erratic. Common causes: poor contact in the sensor connector, wiring harness damage. Estimated repair cost: $17–56.
Symptoms
- Unstable battery coolant temperature readings
- Reduced performance of the hybrid system
- Check Engine Light Illuminated
- Possible reduction in vehicle power
- Activation of emergency operation
Causes
- Poor contact in the sensor connector
- Wiring harness damage
- Temperature sensor malfunction
- Corrosion of electrical contacts
- Problems with the battery control unit
How to Fix
- Check connections and sensor connector
- Inspect the wiring harness for damage
- Test the temperature sensor
- Clean contacts from corrosion
- Replace sensor if necessary
Related codes
Error P2E78 by Vehicle Brand
FAQ
What does the P2E78 code mean?
P2E78 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Intermittent/Erratic
What causes a P2E78 error code?
The most common causes of P2E78 include: Poor contact in the sensor connector; Wiring harness damage; Temperature sensor malfunction; Corrosion of electrical contacts.
How do I fix a P2E78 diagnostic trouble code?
To fix P2E78: Check connections and sensor connector. Inspect the wiring harness for damage. Test the temperature sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2E78?
Yes, but get it checked soon
How much does it cost to fix P2E78?
The estimated repair cost for P2E78 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat