U007F
Control Module Communication Bus M Off
U007F is an OBD-II diagnostic trouble code meaning: Control Module Communication Bus M Off. Common causes: open or short circuit in the can bus, malfunction of one of the control modules. Estimated repair cost: $17–167.
Symptoms
- Check engine light comes on
- Disconnection or incorrect operation of vehicle systems
- Problems starting the engine
- Lost connection with diagnostic equipment
- Spontaneous switching on/off of electronic systems
Causes
- Open or short circuit in the CAN bus
- Malfunction of one of the control modules
- Poor contact in CAN bus connectors
- Problems with module power supply
- Corroded or damaged wiring
How to Fix
- Check the integrity of the CAN bus wiring
- Diagnose control modules for faults
- Check CAN bus connections and connectors
- Test the power supply and mass of the modules
- Update module software (if required)
Related codes
Error U007F by Vehicle Brand
FAQ
What does the U007F code mean?
U007F is an OBD-II diagnostic trouble code that indicates: Control Module Communication Bus M Off
What causes a U007F error code?
The most common causes of U007F include: Open or short circuit in the CAN bus; Malfunction of one of the control modules; Poor contact in CAN bus connectors; Problems with module power supply.
How do I fix a U007F diagnostic trouble code?
To fix U007F: Check the integrity of the CAN bus wiring. Diagnose control modules for faults. Check CAN bus connections and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U007F?
Do not drive — repair immediately
How much does it cost to fix U007F?
The estimated repair cost for U007F is $17–167. Actual cost depends on your vehicle, location, and labor rates.
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