DTC code
P0731
Gear 1 Incorrect Ratio
Technical guide
Symptoms
- Harsh shift into 1st
- check engine light
Probable causes
- Gear 1 incorrect ratio
- worn 1st gear clutch pack
- low ATF
- solenoid fault
- wrong ATF type
Diagnostic steps
- Check ATF level and condition.
- Flush with correct ATF.
- Check 1st gear solenoid.
- Internal transmission inspection if above fails.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0731
Nothing confirmed yet for this code. No guess is offered on purpose.
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