P27D1

Code

Generic P — Powertrain

Pressure Control Solenoid S Performance/Stuck Off

Brand: Generic

Type: P — Powertrain

Views: UK: 33 EN: 47 RU: 35

AI status

Completed

ready

Completed 100%

Page language: EN

Read and record freeze-frame and freeze data with a scan tool; note transmission temperature and vehicle conditions when code set
Verify other stored transmission codes that may indicate related faults
Visually inspect solenoid connector and wiring for corrosion, damage, or loose pins
Backprobe solenoid connector and command solenoid with scan tool to observe response
Check transmission fluid level and condition (contamination, burnt odor, metal particles)
Measure solenoid coil resistance and compare to expected range

Typical solenoid coil resistance: ~15–50 ohms (manufacturer-specific); large deviation indicates open/short
Expected control: PWM from TCM; frequency commonly 50–300 Hz (varies by design)
Duty cycle: 0–100% depending on commanded pressure; stuck-off will show 0% duty when commanded >0%
Operating current: typically 0.2–1.5 A when energized (depends on coil resistance and supply)
Supply voltage at connector (ignition on): ~12 V (or battery voltage) to power driver; verify ground continuity

Retrieve freeze-frame, note transmission temp and driving conditions. Clear code and attempt to re-create while monitoring live data.
Confirm presence of P27D1 only or additional related DTCs (hybrid faults, other solenoids).
Inspect harness and connector visually; repair any damage, push-fit corrosion, or loose terminals.
Backprobe solenoid connector while operating scanner: command TCM to actuate Solenoid S and observe PWM/duty cycle and whether it changes from 0%.
With ignition off, disconnect connector and measure solenoid coil resistance. Compare to spec. Infinite/open or near-zero short indicates coil failure.
With ignition on, verify supply voltage to solenoid connector and check ground return. No supply or no ground indicates wiring or fuse/relay/TCM issue.
If wiring and power are good but solenoid does not respond to commanded PWM, consider bench-testing the solenoid (apply appropriate controlled voltage/current) or swapping with a known-good identical solenoid if available.
If solenoid bench test is good, inspect valve body/pressure control valve for contamination or sticking. Clean/replace valve body as required.
If wiring, solenoid, and valve body check out, test or replace the TCM or repair its driver circuit per manufacturer procedures.
After repairs, clear codes and perform road test under conditions that originally set the code. Re-scan for reappearance and verify proper transmission operation.