What it means
The control circuit for pressure control solenoid R is not performing within the expected range.
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 adjusts transmission hydraulic pressure when commanded by the transmission control module. P27CE sets when the module sees solenoid R circuit behavior outside its expected operating range, which can result from a weak coil or excess resistance in the connection or wiring.
Common causes
Most likely first.
- Solenoid coil resistance out of specification
- High-resistance connection in solenoid wiring or connector
- Fault in the control circuit
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 review related transmission codes to identify the conditions and shifts associated with the solenoid R range/performance fault.
- Inspect the solenoid R connector and wiring for corrosion, loose terminals, heat damage, or other signs of resistance in the circuit.
- Check connector terminal contact and control-wire continuity, looking for voltage drop or resistance that changes when the harness is moved.
- Measure solenoid R coil resistance and compare it with the manufacturer's specification.
- Use scan-tool data to compare commanded solenoid R operation with the available circuit or transmission response data under the conditions that set the code.
- If the coil and harness pass, test the solenoid R control circuit at the module connector according to the wiring diagram.
Common fixes
- Clean and secure high-resistance contacts at the solenoid R connector.
- Repair corroded, damaged, or high-resistance wiring in the solenoid R circuit.
- Replace solenoid R if its coil resistance is outside the manufacturer's specification.
- Repair the control circuit if testing identifies an electrical fault between the solenoid and module.
Can I keep driving?
Avoid towing, steep climbs, and hard acceleration if the transmission slips or shifts unpredictably. Solenoid R pressure control may be ineffective, and continued slipping can overheat or damage the transmission.
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.