U2105
Lost Communications with Engine Control Module
U2105 is an OBD-II diagnostic trouble code meaning: Lost Communications with Engine Control Module. Common causes: open or short circuit in the can bus, engine ecu malfunction. Estimated repair cost: $56–333.
Symptoms
- Check Engine light comes on
- Loss of engine power
- Incorrect operation of other systems (ABS, transmission, etc.)
- The car may go into emergency mode
- Problems starting the engine
Causes
- Open or short circuit in the CAN bus
- Engine ECU malfunction
- Problems with ECU power supply
- Corroded or damaged connectors
- Wiring Harness Problems
How to Fix
- Check the integrity of the CAN bus
- Check power supply and grounding of the ECU
- Inspect the ECU connectors for damage
- Check wiring harness for damage
- If necessary, replace the ECU
Related codes
FAQ
What does the U2105 code mean?
U2105 is an OBD-II diagnostic trouble code that indicates: Lost Communications with Engine Control Module
What causes a U2105 error code?
The most common causes of U2105 include: Open or short circuit in the CAN bus; Engine ECU malfunction; Problems with ECU power supply; Corroded or damaged connectors.
How do I fix a U2105 diagnostic trouble code?
To fix U2105: Check the integrity of the CAN bus. Check power supply and grounding of the ECU. Inspect the ECU connectors for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U2105?
Do not drive — repair immediately
How much does it cost to fix U2105?
The estimated repair cost for U2105 is $56–333. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat