U179C
Lost Communication With One Or More Hybrid/EV Battery Interface Control Modules
U179C is an OBD-II diagnostic trouble code meaning: Lost Communication With One Or More Hybrid/EV Battery Interface Control Modules. Common causes: open or short circuit in the communication circuit, problems with power supply to the battery management module. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Reduced power or inability to start
- Errors in the hybrid/electric powertrain system
- Inability to charge the battery
Causes
- Open or short circuit in the communication circuit
- Problems with power supply to the battery management module
- Malfunction of the battery management module itself
- Wiring harness damage
- Problems with the CAN bus
How to Fix
- Check the integrity of the wiring harness to the battery control module
- Check the module supply voltage
- Scan all modules for additional fault codes
- Check CAN bus connections
- Test or replace the battery management module
Related codes
FAQ
What does the U179C code mean?
U179C is an OBD-II diagnostic trouble code that indicates: Lost Communication With One Or More Hybrid/EV Battery Interface Control Modules
What causes a U179C error code?
The most common causes of U179C include: Open or short circuit in the communication circuit; Problems with power supply to the battery management module; Malfunction of the battery management module itself; Wiring harness damage.
How do I fix a U179C diagnostic trouble code?
To fix U179C: Check the integrity of the wiring harness to the battery control module. Check the module supply voltage. Scan all modules for additional fault codes. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U179C?
Do not drive — repair immediately
How much does it cost to fix U179C?
The estimated repair cost for U179C is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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