P0121 on Ford
Throttle/Pedal Position Sensor Circuit Range/Performance
P0121 on Ford vehicles indicates throttle/pedal position sensor circuit range/performance. Au7o has documented this code across 1 Ford model — most commonly on Transit Connect. This code means the throttle position (or accelerator pedal position) sensor's signal does not match what the computer expects compared with other inputs like airflow, RPM, and the second throttle/pedal sensor. The sensor tells the computer how far the throttle or pedal is open; when its range or performance is off, the computer can't trust how much power you're requesting. You may notice hesitation, surging, poor acceleration, rough idle, or the vehicle dropping into a reduced-power 'limp' mode. It indicates an out-of-range or implausible signal rather than a complete loss of signal. Typical repair costs on Ford range from $140 to $900, depending on the specific model and root cause.
Common Causes of P0121
- •Worn or failing throttle position sensor
- •Dirty or carboned-up throttle body affecting plate position
- •Damaged, frayed, or shorted sensor wiring
- •Corroded or loose sensor connector
- •Poor sensor ground or reference voltage
- •Faulty throttle body / electronic throttle actuator
- •Mismatch between the two throttle or pedal sensor signals
P0121 on Ford by Model
Ford Transit Connect(1 issue)
- Throttle Body/ETC Fault Causing Limp Mode (Reduced Engine Power)2014-2021
Owners report sudden reduced power, poor throttle response, and limp-home behavior due to electronic throttle body contamination/wear or throttle actuator control faults. The issue can be intermittent and may clear after a key cycle, then recur, which is a common pattern in NHTSA complaints and owner reports. It often sets throttle/ETC-related DTCs and can be triggered by carbon buildup or failing throttle position sensing.
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View P0121 across all makes →Frequently Asked Questions
What does P0121 mean on Ford?▼
P0121 stands for "Throttle/Pedal Position Sensor Circuit Range/Performance." This code means the throttle position (or accelerator pedal position) sensor's signal does not match what the computer expects compared with other inputs like airflow, RPM, and the second throttle/pedal sensor. The sensor tells the computer how far the throttle or pedal is open; when its range or performance is off, the computer can't trust how much power you're requesting. You may notice hesitation, surging, poor acceleration, rough idle, or the vehicle dropping into a reduced-power 'limp' mode. It indicates an out-of-range or implausible signal rather than a complete loss of signal. On Ford specifically, this code is documented across 1 model.
What causes P0121 on Ford vehicles?▼
Common causes on Ford: Worn or failing throttle position sensor, Dirty or carboned-up throttle body affecting plate position, Damaged, frayed, or shorted sensor wiring, Corroded or loose sensor connector, Poor sensor ground or reference voltage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0121 on a Ford?▼
Repair costs on Ford range from $140 to $900, depending on the specific model and root cause.
Which Ford models have P0121 documented?▼
Au7o has documented P0121 on 1 Ford model: Transit Connect.