What Does P0736 Mean?
The TCM has detected that the actual gear ratio in reverse does not match the expected ratio. The calculated ratio from the speed sensors deviates from the reverse gear specification when reverse is commanded. The driver may notice slipping when backing up, engine flare when selecting reverse, delayed reverse engagement, or weak reverse power especially under load (such as backing up an incline).
Common Causes
35%
Worn reverse clutch pack or band with depleted friction material
25%
Low or contaminated transmission fluid reducing reverse clutch apply pressure
15%
Faulty reverse apply solenoid or pressure control solenoid
15%
Valve body issue — stuck reverse boost valve, worn manual valve, or leaking reverse circuit gasket
10%
Internal mechanical failure — broken reverse shell, damaged sun gear, or failed low-reverse servo
Diagnostic Steps
1
Check transmission fluid level and condition. Low fluid is the most common simple cause of reverse slippage.
2
With the vehicle safely positioned, select Reverse and monitor ISS and OSS PIDs. Calculate the actual reverse ratio and compare to the manufacturer's specification (typically 2.0–3.5:1).
3
Perform a reverse stall test (briefly, with brakes firmly applied) — note the stall RPM. A higher-than-specified stall RPM confirms reverse clutch slippage.
4
Test the reverse apply solenoid and pressure control solenoid — verify proper resistance, current draw, and operation via scan tool commands.
5
Connect a pressure gauge to the reverse circuit test port (if available) and compare to the manufacturer's specified reverse line pressure.
6
If hydraulic tests are normal but slipping persists, internal damage (worn clutch pack or broken reverse components) is confirmed, requiring transmission removal and overhaul.
Estimated Repair Cost
$200 - $3,800
Parts + labor, varies by vehicle and location
The TCM has detected that the actual gear ratio in reverse does not match the expected ratio. The calculated ratio from the speed sensors deviates from the reverse gear specification when reverse is commanded. The driver may notice slipping when backing up, engine flare when selecting reverse, delay...
The most common cause of P0736 (Reverse incorrect gear ratio) is: Worn reverse clutch pack or band with depleted friction material
Typical repair costs for P0736 range from $200 to $3,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A slipping reverse gear makes backing up unreliable, especially on inclines. The vehicle may roll backward unexpectedly if reverse cannot hold. Use extra caution when parking on hills. Forward gears may still be unaffected. Schedule repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0736 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Automatic Transmission / Gear Ratio Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
