Hours: 07–23 daily

TuningBot DTC Database · v4.37.15

P2121 Accelerator pedal position (APP) / Throttle position (TP) sensor/switch D - range/performance problem

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEngineOBD2

What P2121 means

P2121
Accelerator pedal position (APP) / Throttle position (TP) sensor/switch D - range/performance problem Generic · engine Data confidence 78%

The control module judged the Accelerator pedal position (APP) / Throttle position (TP) sensor/switch D behaviour implausible for the current operating conditions.

Possible causes

  • Wiring
  • APP / TP sensor/switch

Related and nearby codes

How to read P2121

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

121

Specific fault index within the subsystem.

Frequently asked questions about P2121

What does P2121 mean?

Accelerator pedal position (APP) / Throttle position (TP) sensor/switch D - range/performance problem. The control module judged the Accelerator pedal position (APP) / Throttle position (TP) sensor/switch D behaviour implausible for the current operating conditions.

Is P2121 generic or manufacturer-specific?

P2121 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P2121 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database