P27CE

Code

Generic P — Powertrain

Pressure Control Solenoid R Control Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 28 RU: 24

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Page language: EN

Causes

Open or short in solenoid wiring (broken conductor, chafed harness)
Poor or corroded connector or terminal at solenoid or module
Failed pressure control solenoid (stuck, internal short, wrong resistance)
Low battery or supply voltage / poor ground
Transmission fluid contamination or degraded fluid causing solenoid sticking
Faulty TCM/PCM driver or software logic

Symptoms

Check Engine / Transmission warning light (MIL) illuminated
Erratic, harsh or delayed gear shifts
Transmission may go into limp/limited mode
Reduced drivability or slipping feel
Stored transmission-related trouble codes

What to check

Read live data and freeze frame with a scan tool; note duty cycle, commanded state and freeze-frame conditions
Visual inspection of harness and connector for damage, corrosion, pin push-out or fluid contamination
Backprobe signal and ground with engine running and while commanding solenoid to observe voltage and duty changes
Measure solenoid coil resistance with meter (compare to OEM spec)
Check continuity to controller and for short to battery voltage or ground
Verify battery voltage and engine/chassis grounds

Signal parameters

Typical coil resistance: vehicle-specific (commonly ~10–40 ohms) — check OEM spec
Control method: PWM duty cycle 0–100% (controller varies pressure by duty)
PWM frequency: commonly in the 50–300 Hz range (vehicle-specific)
Idle/off voltage: ~0 V (or near ground) when not commanded; supply/driver outputs up to battery voltage when appropriate
Ground continuity: low ohms between solenoid ground and battery negative/chassis

Diagnostic algorithm

Retrieve all transmission-related codes and freeze-frame data. Note battery voltage and conditions at fault time.
Perform a visual inspection of the solenoid connector, wiring harness and transmission case for damage or fluid contamination.
With ignition off, disconnect solenoid connector and measure coil resistance between the solenoid terminals. Compare to OEM spec. Check for short to ground or B+.
Check continuity between the solenoid connector and the TCM connector; check for shorts to battery and ground.
Reconnect and backprobe the signal and ground. With scan tool, command the solenoid ON/OFF or vary duty and observe voltage, duty and TCM commanded values vs actual.
If available, bench-test the solenoid with a fused 12 V source or manufacturer-recommended test to confirm operation and current draw (watch for overheating).
If wiring and solenoid test good but the circuit still faults, suspect TCM driver or intermittent wiring. Wiggle test harness while monitoring live data to reproduce fault.
If mechanical pressure is suspected, verify hydraulic pressure with a transmission gauge while commanding solenoid to confirm pressure response.
Repair or replace failed component (connector, wiring, solenoid, or TCM) as indicated. Clear codes and road test to confirm repair.

Likely causes

Damaged connector or corroded pins at the solenoid
Open or shorted signal/ground wire between solenoid and controller
Failed solenoid coil (out-of-spec resistance or intermittent)
Contaminated transmission fluid causing solenoid to stick

Fault status

⚠️ Status

Pressure Control Solenoid R Control Circuit Range/Performance — control signal or response out of expected range; check solenoid, wiring, connectors and controller.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours