Frayed, chafed, or intermittently shorted wiring in the solenoid harness, often near heat sources or flex points; Corroded or loose electrical connector pins at the solenoid or transmission case pass-through; Failing pressure control solenoid M, where the internal coil becomes intermittent when hot; Contaminated transmission fluid (ATF) causing solenoid valve sticking or erratic operation; Internal transmission valve body wear or debris blocking the solenoid's hydraulic circuit; A faulty transmission control module (TCM) or poor ground connection, though this is less common

DTC codes / P08xx · Transmission / P08C7

P08C7Pressure Control Solenoid M Intermittent

Q: What does code P08C7 mean?

Pressure Control Solenoid M Intermittent. P08C7 indicates that the transmission control module (TCM) has detected an intermittent fault in the electrical circuit for pressure control solenoid M, which is used to regulate hydraulic pressure inside the transmission. The TCM monitors the solenoid's current draw and response time, and it sets this code when the signal is erratic or momentarily lost, rather than completely open or shorted.

P08C7 indicates that the transmission control module (TCM) has detected an intermittent fault in the electrical circuit for pressure control solenoid M, which is used to regulate hydraulic pressure inside the transmission. The TCM monitors the solenoid's current draw and response time, and it sets this code when the signal is erratic or momentarily lost, rather than completely open or shorted.

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 symptoms
Harsh or delayed gear shifts, especially when the transmission is cold or under load
Intermittent slipping or flaring during acceleration
The transmission may enter limp mode (stuck in a single gear) if the fault becomes more frequent
Occasional shudder or vibration during torque converter clutch engagement

Common causes, most likely first

Frayed, chafed, or intermittently shorted wiring in the solenoid harness, often near heat sources or flex points
Corroded or loose electrical connector pins at the solenoid or transmission case pass-through
Failing pressure control solenoid M, where the internal coil becomes intermittent when hot
Contaminated transmission fluid (ATF) causing solenoid valve sticking or erratic operation
Internal transmission valve body wear or debris blocking the solenoid's hydraulic circuit
A faulty transmission control module (TCM) or poor ground connection, though this is less common

How to diagnose and fix it

Verify the code with a scan tool and check for any related transmission codes or pending faults
Inspect the transmission fluid level and condition; look for dark, burnt, or contaminated fluid
Visually inspect the solenoid harness and connectors for chafing, corrosion, or loose pins
Perform a wiggle test on the wiring while monitoring solenoid M data on the scan tool to catch intermittent faults
Measure the resistance of solenoid M at the transmission connector and compare to the manufacturer's specification
If the circuit checks out, remove the transmission pan and inspect the solenoid and valve body for debris or sticking
Replace the faulty solenoid or repair the wiring as needed, then clear the code and verify the repair with a road test

Intermittent Solenoid Codes Can Mislead

An intermittent code like P08C7 often does not mean the solenoid is completely failed; the fault may only appear when the transmission is hot or during specific driving conditions, so a cold static test can miss it.
Wiring harness chafing near the transmission mount or exhaust is a frequent cause that technicians overlook when they replace the solenoid without fixing the underlying wire damage.
Contaminated transmission fluid can cause the solenoid to stick momentarily, setting an intermittent code without any hard failure; a fluid service may resolve the issue if caught early.
A weak battery or charging system can cause voltage spikes that confuse the TCM and trigger intermittent solenoid codes, so always check battery health before condemning the solenoid.
This code can be set by a poor ground connection at the transmission case or chassis, which is often missed during diagnosis because the focus stays on the solenoid circuit itself.

Can I keep driving with P08C7?

You can usually continue driving with P08C7 if the transmission behaves normally, but avoid heavy acceleration or towing until the fault is diagnosed. If the transmission starts slipping, shifting harshly, or entering limp mode, stop driving and seek professional service to prevent internal damage.

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.