U179D
Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
U179D is an OBD-II diagnostic trouble code meaning: Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus. Common causes: open or short circuit in communication circuit, brake control module 2 malfunction. Estimated repair cost: $56–278.
Symptoms
- Check Engine Light Is On
- Disabling ABS/ESP systems
- Other related trouble codes appear
- Loss of some brake system functions
- Possible problems with cruise control
Causes
- Open or short circuit in communication circuit
- Brake control module 2 malfunction
- Connector problems or contact corrosion
- CAN communication bus fault
- Software error in the module
How to Fix
- Check the integrity of the wiring harness to the module
- Inspect and clean electrical connectors
- Check power supply and grounding of the module
- Scan for other related trouble codes
- Repair only from an authorized dealer
Related codes
FAQ
What does the U179D code mean?
U179D is an OBD-II diagnostic trouble code that indicates: Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
What causes a U179D error code?
The most common causes of U179D include: Open or short circuit in communication circuit; Brake control module 2 malfunction; Connector problems or contact corrosion; CAN communication bus fault.
How do I fix a U179D diagnostic trouble code?
To fix U179D: Check the integrity of the wiring harness to the module. Inspect and clean electrical connectors. Check power supply and grounding of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U179D?
Do not drive — repair immediately
How much does it cost to fix U179D?
The estimated repair cost for U179D is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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