P077F
Reverse 2 Incorrect Ratio
Some transmissions provide a second reverse ratio (typically a slower crawler reverse for trailer manoeuvring or hill descent). The TCM detects that the input/output ratio in this gear does not match its calibrated value — slipping clutch or wrong gear actually engaged.
Some transmissions provide a second reverse ratio (typically a slower crawler reverse for trailer manoeuvring or hill descent). The TCM detects that the input/output ratio in this gear does not match its calibrated value — slipping clutch or wrong gear actually engaged.
Common causes
- high
Slipping clutch in reverse 2 element
One of the most commonly reported causes for this code — check this first.
Typical part cost: $660-4400
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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
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Frequently asked questions
What does P077F mean?
P077F means "Reverse 2 Incorrect Ratio". It is a generic OBD-II code that points to a fault in the transmission.
What are the most common causes of P077F?
slipping clutch in reverse 2 element — 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 points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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