Code result
P078A
Shift Timing Solenoid B
High severity
What it means
General fault on shift timing solenoid B — second timing solenoid for shift events that need a different ramp profile (typically downshifts vs. upshifts, or specific gear pairs).
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 electrical or hydraulic fault
highOne of the most commonly reported causes for this code — check this first.
Related help
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