Throttle/Pedal Position Sensor C Circuit Low
The P0227 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor C Circuit Low. This is a moderate severity code.
- 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
- Vehicle stuck in limp mode
- Engine may only idle or very low power
- Throttle position reads 0% on scan tool
Probable Causes (Ranked by Likelihood)
- Short to ground in TPS C signal wire Very High
- Failed TPS C sensor (shorted) High
- Corroded connector causing signal grounding Moderate
- PCM input circuit fault Low
Step-by-Step Diagnostic Procedure
-
Read TPS C voltage on scan tool. Below 0.2V at any throttle position confirms low circuit.
-
Disconnect TPS and check signal wire for short to ground with multimeter.
-
Inspect connector for moisture, corrosion, or fuel contamination.
-
With TPS disconnected, check for PCM bias voltage on signal wire (should be about 5V through pull-up).
Frequently Asked Questions
What does circuit low mean for TPS C?
The PCM detects a voltage below the normal minimum on the TPS C signal wire. This usually means a short to ground or failed sensor.
Why is my car stuck in limp mode?
When the PCM detects a TPS circuit low, it cannot determine throttle position safely, so it limits engine power to prevent unintended acceleration.
Can moisture cause P0227?
Yes, water intrusion into the throttle body connector can short the signal wire to ground, causing a low circuit condition.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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