P077F
Reverse 2 Incorrect Ratio
Generic OBD-II
Common symptoms
What you'll notice
- Check for any loose or damaged wiring connections related to the transmission system.
- Inspect and possibly replace the transmission fluid, ensuring it is at the correct level and in good condition.
- Perform a thorough inspection of the transmission for any signs of wear, damage, or internal failures that may be causing the incorrect ratio.
- Verify and, if necessary, calibrate the shift solenoids and other transmission control components.
- If all else fails, consider replacing the transmission with a new or rebuilt unit if the issue persists and cannot be resolved with other repairs.
Common causes
Most likely first
- Low transmission fluid level
- Faulty transmission solenoid
- Damaged or worn out clutch plates
- Malfunctioning torque converter
- Faulty transmission control module
How to diagnose & fix
Work through it in order
- Slipping transmission or delayed engagement
- Harsh shifting or jerking when changing gears
- Engine revving without corresponding acceleration
- Check Engine Light (CEL) or Transmission Warning Light illumination
- Decreased fuel efficiency
Read & clear P077F yourself
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