What it means
The transmission control module detects that pressure control solenoid R is stuck on.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Pressure Control Solenoid R controls hydraulic pressure in the transmission in response to commands from the control module. This code sets when Solenoid R remains on after it is commanded off, which may result from a spool stuck open or a control-module output that continues to energize it.
Common causes
Most likely first.
- Solenoid spool stuck in open position
- TCM output driver stuck on
- Carbon or debris buildup preventing free movement
Symptoms
- Transmission warning light may illuminate
- Harsh or delayed shifting
- Slipping or unexpected shifts
- Transmission may enter limp mode
How to diagnose it
- Record freeze-frame data and scan for related transmission codes to see when Solenoid R was detected on unexpectedly.
- Check transmission fluid level and condition using the vehicle’s specified procedure, because fluid problems can contribute to abnormal pressure behavior.
- Inspect Solenoid R wiring and its connector for damage, corrosion, loose terminals, or fluid intrusion.
- Compare the commanded state of Solenoid R with available pressure and shift data to confirm the unexpected response when it is commanded off.
- If wiring checks out, test the solenoid and its control output using the manufacturer’s diagnostic procedure to distinguish a stuck spool from an output-driver fault.
Common fixes
- Correct the transmission fluid level or condition if needed.
- Clean and secure the Solenoid R connector or repair damaged wiring.
- Repair or replace Pressure Control Solenoid R if its spool is stuck open.
- Repair the control-module output if testing confirms it continues to energize Solenoid R.
Can I keep driving?
Limit driving and avoid towing or hard acceleration because abnormal pressure can cause harsh shifts or clutch slip. Stop and arrange recovery if the transmission loses drive or shifts unpredictably.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.