Faulty shift solenoid L with an open or high-resistance internal coil; Damaged or corroded wiring harness or connector at the solenoid or TCM; Open circuit in the control wire between the TCM and solenoid L; Short to voltage on the control circuit, often from chafed wiring; Poor ground connection for the solenoid or TCM; Internal TCM driver circuit failure, though less common; Contamination or debris in the valve body causing solenoid malfunction

DTC codes / P08xx · Transmission / P08E5

P08E5Shift Solenoid L Control Circuit High

Q: What does code P08E5 mean?

Shift Solenoid L Control Circuit High. P08E5 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the control circuit for shift solenoid L, which is one of the solenoids that manages hydraulic pressure for gear shifts. The circuit is typically ground-switched by the TCM, so a high voltage reading means the TCM sees the circuit as open, shorted to power, or the solenoid's internal resistance is out of specification.

P08E5 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the control circuit for shift solenoid L, which is one of the solenoids that manages hydraulic pressure for gear shifts. The circuit is typically ground-switched by the TCM, so a high voltage reading means the TCM sees the circuit as open, shorted to power, or the solenoid's internal resistance is out of specification.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Symptoms you may notice

Illumination of the check engine light or transmission warning light, often with no other noticeable symptoms
Harsh or delayed gear shifts, especially when the transmission is cold
The transmission may enter limp mode, limiting vehicle speed and available gears
Slipping or flaring during upshifts or downshifts
Inconsistent shift points or failure to engage certain gears
Poor fuel economy or increased engine RPM at highway speeds due to improper gear selection

Common causes, most likely first

Faulty shift solenoid L with an open or high-resistance internal coil
Damaged or corroded wiring harness or connector at the solenoid or TCM
Open circuit in the control wire between the TCM and solenoid L
Short to voltage on the control circuit, often from chafed wiring
Poor ground connection for the solenoid or TCM
Internal TCM driver circuit failure, though less common
Contamination or debris in the valve body causing solenoid malfunction

How to diagnose and fix it

Perform a visual inspection of the solenoid L wiring and connectors for damage, corrosion, or loose pins
Use a scan tool to command solenoid L on and off and listen for an audible click; no click suggests an electrical fault
Measure the resistance of solenoid L with a multimeter and compare to the manufacturer's specification
Check for continuity and voltage drop on the control circuit between the TCM and solenoid L
Test the TCM output signal with an oscilloscope or a noid light to confirm the driver is functioning
If the solenoid is faulty, replace it and clear the code; if wiring is damaged, repair the harness
After repair, clear codes and perform a relearn or adaptation drive cycle as required by the manufacturer

Don't replace the solenoid before checking this

A high voltage code on a ground-switched solenoid circuit often results from an open circuit rather than a shorted solenoid, so a simple resistance check can save you from replacing a good part.
Corrosion inside a connector can increase resistance and mimic a failed solenoid, so always inspect the pins and seals before condemning the solenoid.
The TCM may set this code intermittently if the wiring harness rubs against a sharp edge, especially near the transmission case or engine mount.
Some vehicles use a single solenoid for multiple functions, so a failure of solenoid L can affect several gear ranges and may be misdiagnosed as a mechanical transmission problem.
After replacing a solenoid or repairing wiring, the TCM may need a adaptive learning reset to prevent harsh shifts and false re-setting of the code.

Can I keep driving with P08E5?

If the vehicle is in limp mode or shifting harshly, avoid highway driving and heavy loads, and have it diagnosed promptly to prevent transmission damage. If the only symptom is the warning light, you can drive cautiously to a repair shop, but do not ignore the code for long.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.