P0228

Universal

Throttle/Pedal Position Sensor/Switch C Circuit High Input

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine computer has detected an electrical signal that is higher than expected in the throttle/pedal position sensor or switch C circuit. These sensors report throttle or pedal position so the computer can manage engine response. This code indicates a detected circuit condition, not proof that the sensor itself has failed. Depending on the vehicle, engine response may be limited or irregular.

Report an error with this code

⚠️ Before You Begin (Safety First)

If acceleration becomes unpredictable, the vehicle loses power, or the engine stalls, pull over safely and avoid continuing to drive until it has been checked. If the vehicle responds normally, arrange diagnosis promptly and drive cautiously; exact risks depend on the vehicle.

Common Symptoms

  • The warning light may be on, while the vehicle otherwise appears to drive normally.
  • The engine may respond unevenly or sluggishly if the computer receives an implausible position signal.
  • The vehicle may limit engine power or enter a reduced-response mode, depending on its control strategy.
  • In some cases, acceleration may be intermittent or the engine may stall; these symptoms are not specific to this code.

Common Causes

  • A damaged, loose, corroded, or contaminated connector may disrupt the sensor circuit.
  • Wiring damage or a short to a voltage source may cause a high circuit input.
  • The throttle or pedal position sensor or switch may produce an abnormal signal.
  • A problem with the circuit's reference supply or ground may affect the signal.
  • A control-module or related circuit fault is possible, but should be considered only after appropriate circuit checks.

Diagnostic Steps

  1. Note any warning lights, changes in engine response, and when they occur; stop driving if acceleration is unpredictable or power is severely reduced.
  2. With the vehicle parked safely and the ignition off, visually inspect accessible wiring and connectors related to the throttle and pedal position circuits for looseness or visible damage. Do not force or disconnect components unless the vehicle-specific instructions allow it.
  3. Check the owner's manual for the correct procedure to read and record diagnostic codes and available freeze-frame information before clearing anything.
  4. If a scan tool is available, observe relevant throttle and pedal position data for readings that are inconsistent or intermittent. Exact expected values and signal relationships depend on the vehicle.
  5. If the code returns or the wiring is damaged, have the circuit tested using service information for the specific model, year, and engine. Avoid probing unidentified terminals or replacing a sensor based on the code alone.

When to Call a Professional

A technician can inspect the circuit and connector, review scan data for the relevant position signals, and test the signal, reference supply, ground, and wiring using vehicle-specific service information. The cause may be a connection, wiring, sensor, or control-system issue, so confirm the fault before replacing parts.

Compare component listings

Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.

Search Amazon Search eBay

Commonly Asked Questions

Does P0228 prove that the throttle or pedal sensor needs replacement?

No. It identifies a high-input condition in the circuit, which can result from a sensor, connector, wiring, reference supply, ground, or another circuit problem. Testing is needed to identify the cause.

Does “high input” mean the accelerator pedal is pressed too far?

Not necessarily. The wording describes an electrical signal condition, not a confirmed pedal position or driver action.

What does the C designation identify?

It distinguishes a particular circuit or signal in the vehicle's system. Its exact meaning and location depend on the model, year, and engine.

Can I keep driving with P0228?

If the vehicle responds normally, cautious driving to arrange diagnosis may be possible. Stop safely and do not continue if acceleration is unpredictable, power is severely limited, or the engine stalls.

Browse Available Code Guides

Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.