U007B
Control Module Communication Bus I Off
U007B is an OBD-II diagnostic trouble code meaning: Control Module Communication Bus I Off. Common causes: broken or damaged can bus wires, short circuit in the circuit. Estimated repair cost: $6–56.
Symptoms
- Check Engine light comes on
- Unstable engine operation
- Failure of some electronic systems
- Problems with data transfer between modules
Causes
- Broken or damaged CAN bus wires
- Short circuit in the circuit
- Malfunction of one of the control modules
- Problems with module power supply
- Contact corrosion
How to Fix
- Check the integrity of the CAN bus wires
- Inspect contacts for corrosion
- Check power supply to control modules
- Diagnose each module for faults
- Replace damaged components
Related codes
Error U007B by Vehicle Brand
FAQ
What does the U007B code mean?
U007B is an OBD-II diagnostic trouble code that indicates: Control Module Communication Bus I Off
What causes a U007B error code?
The most common causes of U007B include: Broken or damaged CAN bus wires; Short circuit in the circuit; Malfunction of one of the control modules; Problems with module power supply.
How do I fix a U007B diagnostic trouble code?
To fix U007B: Check the integrity of the CAN bus wires. Inspect contacts for corrosion. Check power supply to control modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U007B?
Limited driving only, diagnose soon
How much does it cost to fix U007B?
The estimated repair cost for U007B is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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