Code result
P0727
Engine Speed Input Circuit No Signal
High severity
What it means
The transmission control module receives no engine speed signal. Required to coordinate shifts and torque converter lockup with engine state.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Speed signal lost on data bus
highOne of the most commonly reported causes for this code — check this first.
Bus communication fault
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0727 freeNo credit card required