P0121 on FORD F-150 — Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance

Q: "What does P0121 mean on a FORD F-150?"

"P0121 indicates: Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance. This is a fuel and air metering code. 2 FORD F-150 owners have reported this to NHTSA."

Q: "What are the most common causes of P0121 on FORD F-150?"

"Based on 2 NHTSA reports, the most commonly cited components are: Vehicle Speed Control, Electrical System. These percentages are based on the component field in owner complaints."

Q: "Is P0121 serious on my FORD F-150?"

"Of 2 NHTSA reports for this code on FORD F-150, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my FORD F-150 shows P0121?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0121 Means on Your FORD F-150

P0121 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 FORD F-150 owners have reported this issue to NHTSA across model years 2005. Most reports come from the 2005 model year. The most commonly reported component is Vehicle Speed Control (50.0% of reports).

Real FORD F-150 Owner Reports

Source: NHTSA Complaints Database

"2005 ford f150 vehicle loses power and all control while driving on the road. this happened at least six times. very lucky traffic was light most times but one almost a caused rear end collision."

— 2005 FORD F-150 owner · VEHICLE SPEED CONTROL · Filed 08/12/2009

"While driving 35 mph my ford f150 truck engine shut down. the truck lost all power brakes and steering. seconds before it stalled a engine malfunction light came on. i was only able to re-start after coming to a complete stop, placing the truck in park and turning the key off then back on."

— 2005 FORD F-150 owner · ELECTRICAL SYSTEM · Filed 01/08/2009

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'05

Common Causes on FORD F-150

Based on NHTSA complaint component analysis for this vehicle.

VEHICLE SPEED CONTROL 50%

ELECTRICAL SYSTEM 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0121 mean on a FORD F-150? ▾

P0121 indicates: Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance. This is a fuel and air metering code. 2 FORD F-150 owners have reported this to NHTSA.

What are the most common causes of P0121 on FORD F-150? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Vehicle Speed Control, Electrical System. These percentages are based on the component field in owner complaints.

Is P0121 serious on my FORD F-150? ▾

Of 2 NHTSA reports for this code on FORD F-150, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my FORD F-150 shows P0121? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

P0121 on Other Vehicles

→ All codes reported on FORD F-150