The P0736: Reverse Incorrect Gear Ratio refers to a fault where the transmission control module (TCM) detects an improper gear ratio while the vehicle is in reverse. This issue can result from internal transmission problems, faulty sensors, or malfunctioning solenoids controlling the reverse gear.
P0736 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0736: Reverse Incorrect Gear Ratio |
| Is it serious? | Yes, incorrect gear ratios can lead to transmission damage and drivability issues when in reverse. |
| Possible causes | – Incorrect gear ratio detected in reverse – Transmission mechanical issues – Faulty sensors or solenoids |
| How to diagnose? | – Inspect and test for mechanical issues in the transmission – Check gear ratio sensors and solenoids – Replace faulty components if necessary |
P0736 Meaning
The P0736 code indicates that the transmission control module has detected an incorrect gear ratio while the vehicle is in reverse gear. This may be caused by mechanical issues inside the transmission, such as worn gears or bands, or by faulty sensors and solenoids that regulate gear ratios and shifting for reverse.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional transmission-related codes that may help further identify the issue. | OBD-II Scanner |
| Inspect Transmission Components | Inspect the transmission for mechanical issues such as worn or damaged gears, bands, or internal components that could be affecting the reverse gear ratio. | Transmission Tools, Flashlight |
| Test Gear Ratio Sensors | Test the sensors responsible for monitoring the gear ratios in reverse to ensure they are functioning properly. | Multimeter, Diagnostic Scanner |
| Check Solenoids | Inspect the solenoids that control reverse gear shifts to ensure they are working correctly. Replace any faulty solenoids as necessary. | Multimeter, Solenoid Tester |
| Inspect Transmission Fluid | Ensure that the transmission fluid is at the proper level and is not contaminated. Low or poor-quality fluid can cause gear ratio problems. | Transmission Fluid Tester, Dipstick |
| Replace Faulty Components | Replace any faulty sensors, solenoids, or internal transmission components that are contributing to the reverse gear ratio issue. | Replacement Parts, Wrenches, Screwdrivers |
| Clear the Code and Test Drive | After completing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, rescan the vehicle to ensure that the P0736 code has not returned. | OBD-II Scanner |
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko