U0635
Lost Communication With Hybrid/EV Battery Pack Coolant Temperature Sensor B
U0635 is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Pack Coolant Temperature Sensor B. Common causes: open or short circuit in the sensor circuit, coolant temperature sensor b malfunction. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Hybrid system power reduction
- Incorrect battery temperature readings on the dashboard
- Activation of emergency operation
- Increased noise of the cooling system
Causes
- Open or short circuit in the sensor circuit
- Coolant temperature sensor B malfunction
- Poor contact in the sensor connector
- Wiring harness damage
- Hybrid ECU malfunction
How to Fix
- Check the integrity of the sensor circuit (open/short circuit)
- Check the connectors and contacts of the sensor
- Test temperature sensor (resistance/signal)
- Replace the faulty sensor if necessary
- Check and reflash the ECU if it is suspected of being faulty
Related codes
Error U0635 by Vehicle Brand
FAQ
What does the U0635 code mean?
U0635 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Pack Coolant Temperature Sensor B
What causes a U0635 error code?
The most common causes of U0635 include: Open or short circuit in the sensor circuit; Coolant temperature sensor B malfunction; Poor contact in the sensor connector; Wiring harness damage.
How do I fix a U0635 diagnostic trouble code?
To fix U0635: Check the integrity of the sensor circuit (open/short circuit). Check the connectors and contacts of the sensor. Test temperature sensor (resistance/signal). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0635?
Limited driving only, diagnose soon
How much does it cost to fix U0635?
The estimated repair cost for U0635 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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