VOLVO
TCM-P170100 - Reverse Engagement Error. General Failure Information. No sub type information
System
Transmission Control Module (TCM)
Volvo models this fault code applies to
Applies to the following models:
1 modelXC90 (2003–)
Show models by year and engine (2)
What does this fault code mean?
The fault code shows that reverse or forward drive does not engage although the gear selector is in position R or D. The fault applies to the XC90. The fault is general and does not say more precisely what type of fault it is. The cause may be a solenoid that is stuck or a mechanical fault in the gearbox.
Possible causes
- Contact resistance in the connections, or one of the solenoids is stuck in the OFF or ON position
- Mechanical faults in the gearbox
What you can do
- 1Read and note the fault code, clear it and drive the car to see if it returns
- 2With a diagnostic tool: activate solenoid SLC1 and listen for a click. If there is none, the fault is likely in the control system
- 3Have a workshop replace the control system or the transmission if the fault cannot be found in the solenoids or the connectors
Symptoms you may notice3
- Check engine light lit or behaving abnormally
- Red warning symbol and text message in the display
- No automatic gear change
What the fault can affect1
- The transmission is controlled by an auxiliary program
General guidance for car owners. Diagnosis on the car can point to a different cause.