PowertrainP2121
CautionSeverity: Caution - get it checked when you can
Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 38
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| BAIC Motor | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance Brand | Powertrain |
| Mercedes-Benz | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| BMW | P2121 | implausible values Brand | Powertrain |
| BYD | P2121 | APP sensor(main) range Brand | Powertrain |
| Chery | P2121 | APP sensor(main) range Brand | Powertrain |
| Daewoo | P2121 | Accelerator Pedal Position Sensor 1 Malfunction Brand | Powertrain |
| Daihatsu | P2121 | Accelerator sensor out of range Brand | Powertrain |
| DFFS | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance Brand | Powertrain |
| DFFX | P2121 | APP sensor(main) range Brand | Powertrain |
| DFXK | P2121 | Accelerator Position Sensor (G79): Implausible Signal Brand | Powertrain |
| EOBD | P2121 | Gas-/pedalpositionsensor/brytare 'D'-krets område/prestanda Brand | Powertrain |
| Ford | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Geely | P2121 | APP sensor(main) range Brand | Powertrain |
| GM | P2121 | Accelerator pedal position (APP) sensor 1 performance Brand | Powertrain |
| Great Wall | P2121 | APP sensor(main) range Brand | Powertrain |
| Hafei | P2121 | APP sensor(main) range Brand | Powertrain |
| Holden | P2121 | Accelerator Pedal Position (APP) Sensor 1 Performance Brand | Powertrain |
| Honda | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Hyundai | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Isuzu | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Land Rover | P2121 | Pedal position sensor 1 - Range/performance Brand | Powertrain |
| Mazda | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Mitsubishi | P2121 | APS(main) range Brand | Powertrain |
| Opel | P2121 | Accelerator pedal position (APP) sensor 1 performance Brand | Powertrain |
| Perodua | P2121 | Accelerator sensor out of range Brand | Powertrain |
| Peugeot | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Porsche | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Proton | P2121 | APS(main) range Brand | Powertrain |
| Saab | P2121 | Sensor 1 Gaspedalposition Leistungsvermögen Brand | Powertrain |
| MG (SAIC) | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance Brand | Powertrain |
| Smart | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Subaru | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance SAE | Powertrain |
| Suzuki | P2121 | Throttle / Pedal Position Sensor / Switch 'D' Circuit Range / Performance Brand | Powertrain |
| Tata | P2121 | Throttle/Pedal Position Sensor/Switch 'D' Circuit Range/Performance Brand | Powertrain |
| Toyota | P2121 | Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance Brand | Powertrain |
| Volvo | P2121 | Pedal Demand Sensor A Circuit Range/Performance Brand | Powertrain |
| Volkswagen | P2121 | Accelerator Position Sensor (G79): Implausible Signal Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 4
These 7-character codes are manufacturer-specific variants of P2121 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P212100 | Position sensor 1 for the accelerator pedal has a malfunction. Brand | Powertrain |
| SsangYong | P212100 | Throttle position sensor first close hard stop learning out of range Brand | Powertrain |
| SsangYong | P212194 | Throttle valve open learning value deviation error Brand | Powertrain |
| SsangYong | P212199 | Throttle valve close learning value deviation error Brand | Powertrain |
6Related codes
Browse Pxxx codes or P212xx codes.