P07D8

Unable To Engage Gear 8

High severity

The TCM commands a shift to 8th gear but the gear-ratio measurement does not confirm engagement — friction element does not lock up, slipping clutch, or shift solenoid does not respond. Falls back to the previously engaged gear.

Common causes

Solenoid stuck closed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $440-3300
Slipping clutch in 8th gear element
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $440-3300
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P07D8 mean?

P07D8 means "Unable To Engage Gear 8". It is a generic OBD-II code that points to a fault in the transmission.

What are the most common causes of P07D8?

solenoid stuck closed; slipping clutch in 8th gear element — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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