P08E0

Code

Generic P — Powertrain

Shift Solenoid L Stuck On

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 51 RU: 37

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Page language: EN

Causes

Short circuit to battery (power) on Solenoid L control circuit
Failed/shorted shift solenoid (internal coil short)
Stuck valve or mechanical seizure in valve body or solenoid pintle
Damaged wiring harness or chafed insulation causing intermittent/continuous feed
Corroded or poor connector pin making unexpected continuity
Faulty transmission control module (TCM/PCM) output driver

Symptoms

Transmission may be stuck in a gear, limp-home mode, or fail to shift properly
Harsh, delayed, or continuous engagement of a gear
Transmission warning light (MIL) or TCM warning on dash
Reduced performance or reduced fuel economy
Stored P08E0 code and possibly related transmission codes

What to check

Read freeze frame and full DTC list; check for related transmission codes
Visual inspection of wiring and connectors for Solenoid L (damage, corrosion, pin push-out)
Backprobe solenoid connector and measure DC voltage with key ON/engine off and during commanded states
Measure solenoid coil resistance at the connector (compare to spec or other solenoids)
Check for short to battery (voltage present when solenoid is commanded OFF) and short to ground
Use a scan tool to command Solenoid L ON/OFF and observe response and live data

Signal parameters

Typical steady supply voltage: ~12 V (battery) on feed circuit
Control signal: switched ground or PWM from TCM (0–12 V) depending on manufacturer
Solenoid coil resistance typical range: ~6–35 ohms (vehicle-specific) — compare to service spec or other solenoids
Expected behavior when commanded OFF: no battery voltage or high impedance at control pin
Expected behavior when commanded ON: voltage present or PWM duty cycle applied, corresponding current draw increase

Diagnostic algorithm

Retrieve all transmission-related codes and freeze-frame data. Record conditions when code set (temp, RPM, gear).
Clear codes and attempt to reproduce. If code returns, continue diagnostics.
Perform visual inspection of harness and connectors at the transmission solenoid pack/valve body. Repair any physical damage.
With key ON (engine OFF), backprobe the solenoid connector. Identify which pin is feed and which is control. Verify constant battery feed and then verify control line changes when commanded.
Use a scan tool to command Solenoid L OFF and ON while monitoring voltage at the connector. If voltage remains present when commanded OFF, suspect short to power or failed TCM driver.
Measure coil resistance at the solenoid connector (unplugged recommended). Compare to spec or same-type solenoid. Very low resistance suggests internal short; very high/open suggests open circuit.
If wiring checks OK but solenoid stays electrically energized or mechanically engaged, remove valve body/solenoid pack for bench test or replacement. Inspect valve bore and solenoid pintle for contamination or sticking.
If harness and solenoid bench tests are good, test TCM output circuit for shorts or failed driver (measure voltage/ground with solenoid disconnected while commanding). Replace TCM only after ruling out wiring/solenoid/ground faults.
After repair or replacement, clear codes and road test through all shifts; verify no return of P08E0 and restoration of normal shift behavior.
If intermittent, perform wiggle tests on harness and connectors while monitoring live data to reproduce.