Code result
P07D8
Unable To Engage Gear 8
High severity
What it means
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.
Is it safe to drive?
No — stop driving
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.
Most likely causes
Solenoid stuck closed
highOne of the most commonly reported causes for this code — check this first.
Slipping clutch in 8th gear element
mediumA plausible cause — test and verify before replacing parts.
Related help
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