Code result
P077F
Reverse 2 Incorrect Ratio
High severity
What it means
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.
Is it safe to drive?
No — stop driving
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.
Most likely causes
Slipping clutch in reverse 2 element
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P077F freeNo credit card required