Code result
P2121
Throttle/Pedal Position Sensor "C" Range/Performance
Moderate severity
What it means
The "C" channel of the throttle or pedal sensor produces an electrically valid signal that does not match the other channels or the operating point.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Sensor track C worn
highOne of the most commonly reported causes for this code — check this first.
Correlation with tracks A/B lost
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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