Powertrain, generic · Transmission

P08E5 Shift Solenoid L Control Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

High-voltage fault in the control circuit of shift solenoid L, set when the line shows battery voltage or a floating high level while the TCM expects otherwise. No manufacturer documents this code publicly. The analogue for solenoid A illustrates the two possible readings: in GM's 6-speed tables P0974 covers an open circuit as well as a short to power, fails after 1.2 of 1.5 seconds and needs two trips for the MIL, whereas Ford's P0974 only means a short to power. A wire chafed against a powered conductor inside the transmission harness is a typical cause. CARB requires the check. P08E4 is the low counterpart, P08E6 the open circuit. The valve may stay on, giving wrong gears.

Likely causes

Control wire chafed against a powered conductor

Open coil on systems that read opens as high

TCM output stage fault

Symptoms

Check engine or transmission warning light on
Wrong gear selected
Harsh engagement or limp mode

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–1,500

Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift solenoid lwiring harness

References: gsi.ext.gm.com, fordservicecontent.com, law.cornell.edu.