P0228 moderate

Throttle/Pedal Position Sensor C Circuit High

The P0228 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor C Circuit High. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$80 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Reduced engine power
  • Throttle position reads near 100% on scan tool at idle
  • Engine may race or idle too high

Probable Causes (Ranked by Likelihood)

  • Open signal wire in TPS C circuit Very High
  • Failed TPS C sensor (open internally) High
  • Disconnected TPS C connector Moderate
  • Short to voltage in signal wire Low

Step-by-Step Diagnostic Procedure

  1. Read TPS C voltage on scan tool. Above 4.8V at idle confirms high circuit condition.

  2. Check TPS connector is fully seated and plugged in.

  3. Measure TPS C signal wire for open circuit or short to 5V reference.

  4. Test TPS resistance/voltage output across full throttle range. Open at any point confirms sensor failure.

Frequently Asked Questions

What causes a high circuit on TPS C?

A high circuit means the signal voltage is too high, usually from an open wire (signal floats to reference voltage) or a failed sensor.

Can a disconnected sensor cause P0228?

Yes, if the TPS connector is not fully seated, the signal wire becomes open and the voltage will float high.

Is P0228 dangerous?

It can be if the PCM interprets the high reading as full throttle demand. Most systems enter limp mode as a safeguard.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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