P0732: Incorrect gear ratio in second gear
The automatic gearbox sees that input and output speeds don’t match in second gear. Low or worn fluid and internal wear are the usual causes.
| Code | P0732 |
|---|---|
| System | Engine and transmission |
| Group | P07xx, Transmission |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0732 means
The transmission control unit compares how fast the shaft going into the gearbox turns with the shaft coming out. In second gear that ratio is fixed, so if it doesn’t add up, something is slipping inside. It points to the automatic gearbox, not the engine.
Most common causes
- Low gearbox fluid, often from a leak at the sump or seals
- Old, burnt or incorrect type of gearbox fluid
- Input or output speed sensor, or its connector, giving false readings
- Dirty or faulty solenoids or valve body (the block that routes the fluid)
- Worn clutches or bands inside the gearbox
Symptoms
- Engine warning light on
- Revs rise but the car doesn’t pick up speed in second gear
- Harsh, late or missed gear changes
- Gearbox stays in one gear (limp mode)
- Jerks or slipping in town driving
Can you drive with P0732?
With care You can drive gently to a garage, but a slipping gearbox wears quickly and the repair gets more expensive. Avoid hard acceleration, steep hills and towing.
Open the bonnetthe in-depth explanation
How to check it
If the gearbox has a dipstick, check the fluid level and condition with the engine warm: dark or burnt-smelling fluid is a bad sign. With a scanner, live input and output shaft speeds help the garage see which gear is slipping.
How to read and clear P0732 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0732 with its description and whether it’s confirmed, pending or permanent.
This code is usually stored by the gearbox control unit. If the car reports it over standard OBD, you read it for nothing with FREE; to read it straight from the gearbox control unit, with its description and clearing, you need PRO.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P072E The gearbox is stuck in gear 3
- P072F The gearbox is stuck in gear 4
- P0730 Incorrect gear ratio in the automatic gearbox
- P0731 Incorrect gear ratio in first gear
- P0733 Incorrect gear ratio in third gear
- P0734 Incorrect gear ratio in fourth gear
- P0735 Incorrect gear ratio in fifth gear
- P0736 The gearbox is not getting the correct ratio in reverse
- P0700 Transmission control system: fault detected
- P0701 Transmission control system: range/performance
- P0702 Transmission control system: electrical fault
- P0703 Torque converter/brake switch B: circuit fault
What does code P0732 mean?
The transmission control unit compares how fast the shaft going into the gearbox turns with the shaft coming out. In second gear that ratio is fixed, so if it doesn’t add up, something is slipping inside. It points to the automatic gearbox, not the engine.
Can you drive with P0732?
You can drive gently to a garage, but a slipping gearbox wears quickly and the repair gets more expensive. Avoid hard acceleration, steep hills and towing.
How do you clear P0732?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0732 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
