P0221

Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

Q: Is it safe to drive with P0221?

It can trigger reduced-power mode, making the car slow and unpredictable on acceleration. Short, careful trips are usually possible, but get it diagnosed before relying on it in traffic.

Q: Can I just clear P0221?

It will clear, but if the sensor or wiring is still out of range the ECM resets it — often the same drive — and may re-enter limp mode.

Throttle / pedal position Generic OBD-II High

What it means

P0221 sets when the signal from throttle- or accelerator-pedal position sensor B is present but outside its expected range, or doesn't track the other position signals. Because the ECM can't fully trust the throttle demand, it often drops the engine into a reduced-power (limp) mode to keep things safe.

High

Can I keep driving? Often yes, but the car may drop into reduced-power mode and feel sluggish or erratic — drive gently and fix it before depending on full throttle.

Real-world scan data

Seen in

240

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0221 scans

P0121in 60.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced engine power or 'limp' mode
Hesitation, surging, or stumble on acceleration
Erratic or unstable idle

Common causes

Most likely first

Failed throttle- or pedal-position sensor BLikely
Damaged, chafed, or shorted wiring in the sensor circuitCommon
Loose or corroded sensor connectorCommon
Rarely, a failed ECM/PCMLess often

How to diagnose & fix

Work through it in order

Read freeze-frame and check for companion codes (P0220, P0222, P0223) to confirm which circuit is at fault.
Inspect the sensor connector and wiring for damage, corrosion, or a loose pin, and repair as needed.
Back-probe the sensor signal, 5V reference, and ground against spec while slowly sweeping the pedal or throttle.
If wiring and signals check out, replace the throttle-body or accelerator-pedal position sensor.
Clear the code and road-test to confirm the fault is gone.

FAQ

Quick answers

Is it safe to drive with P0221?+

It can trigger reduced-power mode, making the car slow and unpredictable on acceleration. Short, careful trips are usually possible, but get it diagnosed before relying on it in traffic.

Can I just clear P0221?+

It will clear, but if the sensor or wiring is still out of range the ECM resets it — often the same drive — and may re-enter limp mode.

Read & clear P0221 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX