U179A
Lost Communication With Hybrid/EV Powertrain Control Module 2
U179A is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Powertrain Control Module 2. Common causes: broken or damaged can bus wires, poor contact in the control module connectors. Estimated repair cost: $167–556.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Reducing power or turning off the hybrid system
- Problems with charging a high-voltage battery
- Inability to switch between driving modes
Causes
- Broken or damaged CAN bus wires
- Poor contact in the control module connectors
- Malfunction of the hybrid transmission control module
- Module power problems
- Corrosion or damage to electronic components
How to Fix
- Check the integrity of the CAN bus wiring and connectors
- Check the power and ground of the control module
- Scan all modules for additional errors
- Check or replace the hybrid powertrain control module
- Repair only from an authorized dealer
Related codes
FAQ
What does the U179A code mean?
U179A is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Powertrain Control Module 2
What causes a U179A error code?
The most common causes of U179A include: Broken or damaged CAN bus wires; Poor contact in the control module connectors; Malfunction of the hybrid transmission control module; Module power problems.
How do I fix a U179A diagnostic trouble code?
To fix U179A: Check the integrity of the CAN bus wiring and connectors. Check the power and ground of the control module. Scan all modules for additional errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U179A?
Do not drive — repair immediately
How much does it cost to fix U179A?
The estimated repair cost for U179A is $167–556. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat