U1291
MICU Lost Communication With Relay Control Module
U1291 is an OBD-II diagnostic trouble code meaning: MICU Lost Communication With Relay Control Module. Common causes: broken or damaged wires between micu and relay module, relay control module failure. Estimated repair cost: $17–89.
Symptoms
- Failure to operate elements controlled via a relay (headlights, power windows, etc.)
- Malfunction indicator light comes on
- Unstable operation of electrical equipment
- Errors in other system modules
Causes
- Broken or damaged wires between MICU and relay module
- Relay control module failure
- Relay Module Power Problems
- Corrosion or oxidation of contacts in connectors
- Malfunction of the MICU itself
How to Fix
- Check the integrity of the wiring harness between the modules
- Inspect connectors for corrosion and damage
- Check power supply to relay module
- Diagnose the MICU and relay module
- If necessary, replace the faulty module or wiring
Related codes
FAQ
What does the U1291 code mean?
U1291 is an OBD-II diagnostic trouble code that indicates: MICU Lost Communication With Relay Control Module
What causes a U1291 error code?
The most common causes of U1291 include: Broken or damaged wires between MICU and relay module; Relay control module failure; Relay Module Power Problems; Corrosion or oxidation of contacts in connectors.
How do I fix a U1291 diagnostic trouble code?
To fix U1291: Check the integrity of the wiring harness between the modules. Inspect connectors for corrosion and damage. Check power supply to relay module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1291?
Yes, but get it checked soon
How much does it cost to fix U1291?
The estimated repair cost for U1291 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat