U0029
Vehicle Communication Bus A Performance
U0029 is an OBD-II diagnostic trouble code meaning: Vehicle Communication Bus A Performance. Common causes: broken or damaged can bus wires, short circuit in can circuit. Estimated repair cost: $6–111.
Symptoms
- Check Engine Light Is On
- Malfunctions of various vehicle systems
- Lost connection with some modules
- Incorrect dashboard readings
- Problems with diagnostics via OBD-II
Causes
- Broken or damaged CAN bus wires
- Short circuit in CAN circuit
- Fault in one of the modules connected to the bus
- Poor contact in CAN bus connectors
- Problems with module power supply
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect connectors and contacts for corrosion
- Check voltage in CAN circuit
- Disable the modules one by one to find the faulty one.
- Update ECU software
Related codes
Error U0029 by Vehicle Brand
FAQ
What does the U0029 code mean?
U0029 is an OBD-II diagnostic trouble code that indicates: Vehicle Communication Bus A Performance
What causes a U0029 error code?
The most common causes of U0029 include: Broken or damaged CAN bus wires; Short circuit in CAN circuit; Fault in one of the modules connected to the bus; Poor contact in CAN bus connectors.
How do I fix a U0029 diagnostic trouble code?
To fix U0029: Check the integrity of the CAN bus wiring. Inspect connectors and contacts for corrosion. Check voltage in CAN circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0029?
Limited driving only, diagnose soon
How much does it cost to fix U0029?
The estimated repair cost for U0029 is $6–111. Actual cost depends on your vehicle, location, and labor rates.
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