P0221: How to Diagnose & Fix — Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance
6 vehicles · 4 makes · $50-$900 repair
How to diagnose and fix P0221: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford Transit Connect · 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.
Common Symptoms
- Reduced engine power message/limp mode
- Poor throttle response or no acceleration
- Stalling or near-stalling at idle
- Intermittent issue resolved by key cycle
- Check engine light on
How to Fix
Confirm DTCs and perform throttle body inspection/cleaning if contamination is present; if faults persist, replace the throttle body assembly and perform the required idle/throttle relearn procedure. Inspect related wiring/connectors and verify PCM updates if applicable.
Sources for this issue (1)
Volvo V40 · 2000–2004
The S40/V40 first generation (2000-2004) uses the same problematic ETM as other Volvos of the era. Internal contact wear causes throttle position sensor errors and reduced power mode.
Common Symptoms
- Reduced power mode
- Check engine light
- Stalling
- Rough idle
How to Fix
Confirm ETM failure by scanning for throttle-related DTCs such as ECM-91A7/91B7 or generic P0121, P0221, and by checking live throttle angle signals for dropouts or mismatch between the internal position sensors. On the 2000-2004 V40, the fix is typically replacement of the Magneti Marelli electronic throttle module with an updated/rebuilt unit, followed by throttle adaptation/software initialization with Volvo VIDA or equivalent; inspect and clean the throttle body connector and wiring at the same time. If the car has severe idle instability or stalling, do not rely on cleaning alone, because worn internal contact tracks usually return quickly. Typical repair cost is about $500-$900 using a quality rebuilt ETM and adaptation, or $900-$1,400 with a new OEM unit and dealer programming.
Volvo V70 · 1999–2002
Same ETM failure as S70/S60/S80 of the era. The drive-by-wire throttle body contacts wear internally. Early P2 V70s (1999-2002) are most affected.
Common Symptoms
- Reduced power mode
- Stalling
- Check engine light
- Intermittent throttle response
How to Fix
Confirm ETM failure by scanning for throttle-related Volvo/OBD-II codes such as ECM-91A7, ECM-91B7, P0121, P0221, or limp-home faults, then compare live throttle angle and pedal position data for erratic readings. On 1999-2002 V70 models with the Magneti Marelli electronic throttle, the proper repair is replacement with the updated contactless ETM or a professionally rebuilt unit, followed by software download/ETM adaptation using VIDA/DiCE or dealer-level programming. Also inspect and clean the throttle connector and check for wiring or vacuum issues before condemning the unit. Typical total cost is about $500-$900 for a rebuilt/upgraded ETM installed, or roughly $900-$1,400 with a new unit and dealer software/labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- XeMODeX VO.1020.36001822.00.24 pre-programmed contactless Volvo ETM
replace a diagnosed failed ETM with a pre-programmed contactless unit and return the original core Fitment/availability: 1999-2001 Volvo V70 turbo or 1999-2002 V70 non-turbo with a matching Magneti Marelli ETM/reference number and VIN-co…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Chevrolet Impala · 2006–2016
Volvo C70 · 1999–2005
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P0221 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0221 mean?
P0221 stands for "Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance." This code means the second throttle or accelerator pedal position sensor (circuit B) is sending a signal that is out of the expected range or does not track properly with the other sensor. Modern drive-by-wire systems use redundant sensors, and the computer compares them for agreement. When sensor B's voltage is implausible or inconsistent, this code sets. It can cause hesitation, surging, reduced power, or a forced limp mode for safety.
What are the most common causes of P0221?
The most common causes of P0221 are: Faulty throttle position sensor (sensor B), Faulty accelerator pedal position sensor, Dirty or worn throttle body, Wiring or connector problems (corrosion, chafing), Poor ground or reference voltage to the sensor, Intermittent open or short in the signal circuit, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0221?
Repair costs for P0221 range from $50 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0221?
Au7o has documented P0221 across 6 vehicle models from 4 manufacturers: Chevrolet, Ford, Jeep, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.