Error code P0731 is displayed and the check engine light is on - what does this mean?
The OBD/EOBD system has detected an error in the first gear of the automatic transmission. DTC P0731 indicates that the transmission control unit has registered an incorrect transmission ratio in first gear. With various manufacturers, this trouble code can also be referred to as "Gear 1 Incorrect Ratio".
What can cause this error code?
- Defective solenoid valves in the transmission control block
- Worn clutches or brake bands in first gear
- Low or contaminated transmission oil level
- Defective transmission oil pump
- Damaged seals in the hydraulic system
- Faulty transmission control unit (TCM)
- Clogged transmission oil filter
- Mechanical damage to gearwheels or planetary gears
- Loose or corroded cable connections
- Defective speed sensors
What symptoms occur in parallel with fault code P0731?
- Shifting problems: The transmission does not shift into first gear or refuses to start off
- Jerking when starting off: Unsteady engine running and vibrations when starting
- Overheating: The transmission becomes unusually hot
- Emergency running program: The vehicle gets stuck in a limited gear
- Grinding noises: Metallic noises from the transmission area
- Delayed gear engagement: Time delay when engaging first gear
How can the problem with error code P0731 be rectified?
- Repairing the fault requires a systematic diagnosis of the transmission components.
- Check the transmission oil level and top up with the correct specification if necessary, changing the transmission oil filter at the same time
- Identify defective solenoid valves in the transmission control block and replace with new original parts
- Replace worn clutches and first gear brake bands, which requires opening the transmission
- Read out transmission control unit (TCM) for fault memory and replace completely if defective
- Check the hydraulic system for leaks and repair damaged seals and lines
- Test speed sensors on the transmission and replace with functional sensors if they fail
- Carry out a complete transmission flush and clean all hydraulic components in the process
FAQ - Frequently asked questions about DTC P0731
Can I continue driving with error code P0731?
No, you should not continue to use the vehicle. Code P0731 indicates serious transmission problems that can lead to costly consequential damage. Drive to a specialist workshop immediately.
How much does it cost to repair error code P0731?
The costs vary greatly depending on the cause: oil changes cost 150-300 euros, solenoid valves 300-800 euros, while a transmission overhaul can cost 2000-5000 euros. A precise diagnosis is therefore essential.
How can I delete error code P0731 myself?
The code P0731 can be deleted with an OBD scanner, but will return if the root cause has not been rectified. A professional repair is essential.
Is error code P0731 manufacturer-specific?
No, P0731 is a standardized EOBD code that has the same meaning for all manufacturers. However, the repair procedures may vary depending on the type of transmission.
Can bad transmission fluid cause fault code P0731?
Yes, old or incorrect transmission oil is a common cause of this fault code. Regular oil changes according to the manufacturer's instructions can prevent the fault.
How long does it take to repair code P0731?
Depending on the cause, the repair can take between 2 hours (oil change) and several days (transmission overhaul). The diagnosis alone usually takes 1-2 hours.
How to change front wheel bearing on MERCEDES-BENZ M W163 TUTORIAL | AUTODOC
How to change fuel filter BMW 3 (E90) [TUTORIAL AUTODOC]
How to change Front wheel bearing on VW GOLF 4 TUTORIAL | AUTODOC
How to change a rear brake pads FORD FOCUS 3 TUTORIAL | AUTODOC
How to change pollen filter / cabin filter on AUDI A6 (C6) [TUTORIAL AUTODOC]
How to change engine thermostat on PEUGEOT 207 [TUTORIAL AUTODOC]
How to change fuel filter NISSAN X-TRAIL T30 TUTORIAL | AUTODOC
How to change front wheel bearing TOYOTA YARIS XP10 TUTORIAL | AUTODOC
Free download PDF
1.38 MB
Free download PDF
Free download PDF
Free download PDF
Free download PDF
Free download PDF
Ask on the forum
How to fix your car with AUTODOC CLUB
K2 ROTON wheel cleaner overview
Petrol or diesel: The engine showdown! | AUTODOC
DIY car soundproofing | AUTODOC tips
