What is the P0121 error code?

The control module evaluates the designated throttle or pedal position signal for plausible range, progression, and correlation with other available position and operating inputs. P0121 is stored when the signal does not meet the calibrated performance criteria during the applicable monitoring conditions.

What does P0121 mean?

The control module has determined that a throttle or accelerator-pedal position signal is outside its expected operating range or does not behave plausibly under the current conditions. Depending on the system and severity of the fault, the vehicle may experience hesitation, unstable idle, reduced power, limited throttle response, or no obvious drivability symptoms.

System Faults

Diagnostic Reasoning

An engineering-focused reference for the interpretation of automotive fault logic. We prioritize diagnostic methodology over component replacement.

Metodoloji

Tanı Zihniyetimiz Makalelerimiz

Uyumluluk

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