Reverse Incorrect Ratio
What does P0736 mean?
The P0736 code means the vehicle's onboard diagnostic system has detected: Reverse Incorrect Ratio. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Slipping in reverse gear
- Delayed or no reverse engagement
- RPM flare when selecting reverse
- Burning smell from transmission
Probable Causes (Ranked by Likelihood)
- Worn reverse clutch pack or band Very High
- Low transmission fluid High
- Valve body malfunction in reverse circuit Moderate
- Broken reverse apply piston or servo Low
Step-by-Step Diagnostic Procedure
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Check transmission fluid level and condition -- burnt fluid strongly suggests internal wear
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Monitor reverse gear ratio with speed sensors
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Check reverse apply circuit pressure
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Inspect for additional transmission codes
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Internal transmission rebuild is typically required for reverse clutch failure
Frequently Asked Questions
Can I drive with code P0736?
Drive short distances only. An incorrect gear ratio indicates the transmission is slipping or not engaging properly. Continued driving can cause catastrophic transmission failure.
Does P0736 mean I need a new transmission?
Not always, but often. If the cause is a worn clutch pack or band, a transmission rebuild or replacement is typically necessary. If a solenoid or valve body is the cause, repair may be less extensive.
How is gear ratio measured for P0736?
The TCM compares input shaft speed to output shaft speed. The calculated ratio should match the expected gear ratio. When the ratio deviates beyond a threshold, the code is set.