P0736Reverse Incorrect Ratio
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The transmission module divides input (turbine) speed by output speed and compares the result with the ratio of the commanded gear; a deviation means slip – a clutch or brake not holding, too little pressure – or a wrong gear. Thresholds: Ford more than 30 rpm off for 1.8 s three times (diesel 2023: over 20 % for 12 s), GM's 2006 tables and the Allison 1000 converter slip of 200–230 rpm for 2.25 s after one trip, Saab's Aisin boxes over 20 % twelve times without MIL. P0736 concerns reverse. The check needs reversing under load, so short manoeuvres are often not enough; a 2006 GM table sets it after 2 s of slip above 100 rpm without the diagnostic gear step used for forward gears. Slipping or delayed engagement of reverse, especially uphill, is typical; a worn reverse clutch or low/reverse brake is the usual cause.
- What you may notice
- Delayed or slipping engagement of reverse
- No reverse uphill or under load
- Transmission warning, limp mode, check engine light depending on manufacturer
- Likely causes
- LikelyFluid level or condition
- LikelyReverse clutch or low/reverse brake worn
- PossibleValve body, shift valve or gasket
- RareOil pump or pump cover
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.