P2109
Throttle/Pedal Position Sensor A Minimum Stop Performance
What it means
The ECU detects that the throttle position sensor A signal at the closed-throttle stop does not match the learned minimum value. The mechanical or electrical zero reference of the throttle has drifted out of the expected range, often after cleaning, replacement or wear.
Is it safe to drive?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Carbon deposits on throttle plate
highOne of the most commonly reported causes for this code — check this first.
Throttle position sensor drift
highOne of the most commonly reported causes for this code — check this first.
Idle/throttle relearn not performed
mediumA plausible cause — test and verify before replacing parts.
Related help
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