P0220
UniversalThrottle/Pedal Position Sensor/Switch B Circuit Malfunction
The engine computer has detected a problem in the electrical circuit for throttle or accelerator-pedal position sensor/switch B. These sensors report throttle or pedal position so the computer can manage engine power. A circuit fault can lead to poor throttle response or reduced-power operation, but the code alone does not prove that the sensor itself has failed.
⚠️ Before You Begin (Safety First)
If throttle response becomes unpredictable, the engine stalls, or the vehicle cannot maintain safe power, pull over safely and stop driving; arrange diagnosis or towing. Avoid driving if you cannot reliably control the vehicle.
Common Symptoms
- The warning light may come on while the vehicle otherwise seems to drive normally.
- Throttle response may be delayed, limited, or inconsistent if the computer cannot rely on the position signal.
- The engine may run roughly, hesitate, or stall if the fault disrupts engine control.
- The vehicle may enter reduced-power operation to limit engine output.
- There may be no noticeable symptoms if the fault is intermittent or has little effect on operation.
Common Causes
- A fault within the throttle or accelerator-pedal position sensor/switch B circuit.
- A loose, damaged, corroded, or poorly connected electrical connector.
- Damaged wiring or an intermittent electrical connection in the circuit.
- A problem with circuit power or ground, where applicable to the vehicle's design.
- A control-system fault; diagnosis is needed before identifying a failed component.
Diagnostic Steps
- Note when the warning appeared and whether throttle response changed; stop driving if control is unreliable.
- With the vehicle safely parked and the ignition off, visually inspect accessible sensor and harness connectors for looseness or visible damage. Do not pull on wiring.
- Check for related warning lights or diagnostic codes with a suitable scan tool and record the results before clearing anything.
- If the code returns or symptoms are present, have the circuit tested using service information specific to the vehicle. Avoid replacing a sensor based only on this code.
When to Call a Professional
A technician can review related codes and scan data, then inspect the sensor signal and circuit using the vehicle-specific wiring information and test procedures. Testing should distinguish a sensor fault from a connector, wiring, power, or ground problem before parts are replaced.
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Commonly Asked Questions
Does P0220 mean the throttle or pedal sensor must be replaced?
No. It identifies a malfunction in the sensor/switch B circuit, which can also result from wiring, connector, power, or ground problems. Testing is needed to locate the fault.
Can I keep driving with P0220?
That depends on how the vehicle behaves. If throttle response is unpredictable, power is severely limited, or the engine stalls, stop in a safe place and arrange assistance.
Why might there be no noticeable symptoms?
An intermittent or limited circuit problem may set the code without an obvious change in operation. The code still warrants diagnosis, especially if it returns.
What should be checked before replacing parts?
Check for related codes and review scan data, then inspect the relevant connector and wiring and test the circuit using vehicle-specific procedures.
Browse Available Code Guides
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