U0291
Lost Communication With Gear Shift Control Module B
U0291 is an OBD-II diagnostic trouble code meaning: Lost Communication With Gear Shift Control Module B. Common causes: open or short circuit in wiring harness, shift module b malfunction. Estimated repair cost: $56–222.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Gear shifting problems
- Reduced engine power
- Possible jerking when changing gears
Causes
- Open or short circuit in wiring harness
- Shift Module B Malfunction
- Connector problems or contact corrosion
- Engine control unit malfunction
- Module power problems
How to Fix
- Check the integrity of the wiring harness to the module
- Inspect and clean connector contacts
- Check power supply and grounding of the module
- Test shift module B
- Replace module if necessary
Related codes
Error U0291 by Vehicle Brand
FAQ
What does the U0291 code mean?
U0291 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Gear Shift Control Module B
What causes a U0291 error code?
The most common causes of U0291 include: Open or short circuit in wiring harness; Shift Module B Malfunction; Connector problems or contact corrosion; Engine control unit malfunction.
How do I fix a U0291 diagnostic trouble code?
To fix U0291: Check the integrity of the wiring harness to the module. Inspect and clean connector contacts. Check power supply and grounding of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0291?
Do not drive — repair immediately
How much does it cost to fix U0291?
The estimated repair cost for U0291 is $56–222. Actual cost depends on your vehicle, location, and labor rates.
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