PowertrainP0121
CautionSeverity: Caution - get it checked when you can
Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
Key terms: SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The throttle position sensor reading does not match the position the engine computer expects, so it may limit engine power.
2Common causes
- Faulty throttle position sensor
- Carbon build-up in the throttle body
- Damaged wiring or connector
- Faulty accelerator pedal position sensor
- Throttle body needs recalibration
3Can I drive?
Usually safe to drive gently, but the car may enter reduced-power mode. If power drops suddenly, drive to a safe place and have it checked.
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 43
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| BAIC Motor | P0121 | Throttle sensor signal unreasonable Brand | Powertrain |
| Mercedes-Benz | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| BMW | P0121 | Signal implausible w/respect to substitute value Brand | Powertrain |
| BYD | P0121 | TP sensor range Brand | Powertrain |
| Chery | P0121 | TP sensor range Brand | Powertrain |
| Chrysler | P0121 | Accelerator Pedal Position Sensor (APPS) 5V supply circuit Brand | Powertrain |
| Daewoo | P0121 | Throttle Position Sensor (TPS) Stuck Brand | Powertrain |
| Daihatsu | P0121 | Throttle Sensor Out of Range Brand | Powertrain |
| DFFS | P0121 | ECU and ABS communication lost Brand | Powertrain |
| DFFX | P0121 | TP sensor range Brand | Powertrain |
| DFXK | P0121 | Throttle sensor signal implausible Brand | Powertrain |
| EOBD | P0121 | Kiihdytinpoljin/asentoanturi/kytkin 'A' piirin alue/toiminta Brand | Powertrain |
| Fiat | P0121 | Lost communication with Anti-Lock Brake System(ABS) Control module Brand | Powertrain |
| Ford | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Geely | P0121 | TP sensor range Brand | Powertrain |
| GM | P0121 | Throttle position (TP) sensor performance Brand | Powertrain |
| Great Wall | P0121 | TP sensor range Brand | Powertrain |
| Hafei | P0121 | TP sensor range Brand | Powertrain |
| Holden | P0121 | Throttle Position Sensor Performance Brand | Powertrain |
| Honda | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Hyundai | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Isuzu | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Land Rover | P0121 | Throttle position sensor signal - Range/performance Brand | Powertrain |
| Mahindra | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Maserati | P0121 | lost communication with ABS control module Brand | Powertrain |
| Mazda | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Mitsubishi | P0121 | TP sensor range Brand | Powertrain |
| Opel | P0121 | Throttle position (TP) sensor performance Brand | Powertrain |
| Perodua | P0121 | Throttle Sensor Out of Range Brand | Powertrain |
| Peugeot | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Porsche | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Proton | P0121 | TP sensor range Brand | Powertrain |
| Saab | P0121 | Rendimento sensore posizione farfalla Brand | Powertrain |
| MG (SAIC) | P0121 | Throttle Potentiometer Input - Circuit fault Brand | Powertrain |
| Smart | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Sprinter | P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance SAE | Powertrain |
| Subaru | P0121 | Throttle Position Sensor Performance Problem Brand | Powertrain |
| Suzuki | P0121 | Throttle / Pedal Position Sensor / Switch 'A' Circuit Range / Performance Brand | Powertrain |
| SWM Motor | P0121 | Throttle sensor signal is unreasonable Brand | Powertrain |
| Tata | P0121 | Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance Brand | Powertrain |
| Toyota | P0121 | Throttle 1 and throttle 2 signals inconsistent Brand | Powertrain |
| Volkswagen | P0121 | Throttle position sensor (G69): 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 P0121 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Porsche | P012100 | No description available | Powertrain |
| SsangYong | P012100 | Throttle/Pedal position sensor/switch 'A' circuit range/perform Brand | Powertrain |
| SsangYong | P012101 | Throttle position sensor actuator's learning control malfunction Brand | Powertrain |
| SsangYong | P012102 | Faulty throttle body return spring Brand | Powertrain |
6Related codes
Browse Pxxx codes or P012xx codes.