What Does P0225 Mean?
This code indicates the throttle/pedal position sensor/switch C circuit is malfunctioning. Some electronic throttle control systems use three position sensors for additional redundancy. Sensor C has been detected outside its expected operating range. In some manufacturers, this code refers to the accelerator pedal position sensor rather than the throttle body sensor.
Common Causes
35%
Faulty accelerator pedal position sensor C with worn or contaminated resistive element
30%
Damaged or corroded wiring at the pedal position sensor connector due to foot well moisture exposure
20%
Failed throttle position sensor C (on systems with triple TPS) in the throttle body
15%
ECM internal fault on the sensor C analog input channel
Diagnostic Steps
1
Step 1: Monitor pedal position sensor C PID (or TPS C, depending on system) on a scan tool while slowly depressing and releasing the accelerator. The signal should sweep smoothly without dropouts or dead spots.
2
Step 2: Check the accelerator pedal position sensor connector in the driver footwell for moisture, corrosion, or damage. These connectors are exposed to water intrusion from wet shoes and floor mat cleaning.
3
Step 3: Measure the sensor C signal voltage at the connector while cycling the pedal. Verify smooth voltage change from approximately 0.5V to 4.5V across the full range.
4
Step 4: Verify 5V reference and ground voltages at the pedal sensor connector. If reference is missing, check for an open in the supply wire or overloaded reference circuit.
5
Step 5: Replace the accelerator pedal assembly (sensor is typically integrated) and verify proper operation through full pedal travel.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
This code indicates the throttle/pedal position sensor/switch C circuit is malfunctioning. Some electronic throttle control systems use three position sensors for additional redundancy. Sensor C has been detected outside its expected operating range. In some manufacturers, this code refers to the ac...
The most common cause of P0225 (Throttle/Petal Position Sensor/Switch B Circuit Intermittent) is: Faulty accelerator pedal position sensor C with worn or contaminated resistive element
Typical repair costs for P0225 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A faulty pedal position sensor C typically triggers reduced power mode. While this limits performance, it prevents unintended acceleration. Sudden limp mode activation on the highway can surprise the driver.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0225 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
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