P0224 moderate

Throttle/Pedal Position Sensor C Circuit

The P0224 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor C Circuit. This is a moderate severity code.

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

  • Check Engine Light on
  • Reduced engine power or limp mode
  • Erratic throttle response
  • Engine may idle higher or lower than normal

Probable Causes (Ranked by Likelihood)

  • Faulty throttle position sensor C Very High
  • Damaged wiring or connector to TPS C High
  • Throttle body contamination affecting sensor Moderate
  • PCM/ECM input circuit failure Low

Step-by-Step Diagnostic Procedure

  1. Read TPS C voltage on scan tool. Should show smooth voltage increase from idle (0.5V) to wide open throttle (4.5V).

  2. Inspect the throttle body or accelerator pedal assembly connector for damage or corrosion.

  3. Test TPS C output while slowly moving the throttle. Any dropouts or jumps indicate a faulty sensor.

  4. Compare TPS A, B, and C readings. They should track proportionally as the throttle opens.

Frequently Asked Questions

What is throttle position sensor C?

TPS C is a third throttle position sensor used in some drive-by-wire throttle systems for redundancy. It provides an additional cross-check of throttle blade position.

Why does my vehicle have three throttle sensors?

Modern vehicles use redundant sensors for safety. If one sensor disagrees with the others, the PCM can detect a fault and limit throttle to prevent unintended acceleration.

Can I drive with P0224?

You can drive short distances, but the vehicle may enter limp mode (reduced power) as a safety precaution. Have it repaired promptly.

Sources

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

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