U0291
Lost Communication With Gear Shift Control Module B
The vehicle bus reports loss of communication with gear shift control module B. Shift-by-wire requests for park/reverse/drive coordinated through this node are no longer answered.
The vehicle bus reports loss of communication with gear shift control module B. Shift-by-wire requests for park/reverse/drive coordinated through this node are no longer answered.
Common causes
- high
Bus wiring open or shorted
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-2200
- medium
Module without power or ground
A plausible cause — test and verify before replacing parts.
Typical part cost: $220-2200
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does U0291 mean?
U0291 means "Lost Communication With Gear Shift Control Module B". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0291?
bus wiring open or shorted; module without power or ground; module failed — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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