U0291

Lost Communication With Gear Shift Control Module B

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–222 (est.)

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

U0290 U0292 U0293