Throttle/Pedal Position Sensor C Circuit Low Input
The P0227 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the throttle position sensor (TPS) or pedal position sensor circuit C. This sensor is part of the electronic throttle control system and provides input to the ECM for throttle angle and accelerator pedal position. A low input means the voltage is below the expected range, which can cause improper throttle response, reduced power, and potential limp mode activation.
01. Most Common Causes
- Faulty throttle position sensor (TPS) or pedal position sensor
- Open or shorted wiring in sensor circuit C
- Poor electrical connection at sensor or ECM
- Corroded or damaged connector pins
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Erratic idle or stalling
- Throttle pedal unresponsive or delayed
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0227 and check for other codes.
Step 2: Visually inspect the TPS/pedal sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: With key on engine off, measure voltage at sensor signal wire (typically 0.5-4.5V) and compare to spec.
Step 4: Test sensor resistance across its range; replace if out of spec.
Step 5: Check for continuity and shorts in wiring between sensor and ECM; repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic. Have it diagnosed promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for sensor replacement, plus diagnostic fees. Wiring repairs may add $100-$200.