What Does P0229 Mean?
This code indicates the throttle/pedal position sensor/switch C circuit is exhibiting intermittent behavior. The ECM has detected brief, unexpected voltage changes in the sensor C signal that do not correspond to actual pedal or throttle movement. This typically indicates an early-stage sensor failure or connection issue.
Common Causes
35%
Worn pedal position sensor C with intermittent contact on the resistive track producing sporadic signal changes
30%
Loose or corroded pedal sensor connector with intermittent contact exacerbated by foot pressure and vibration
25%
Intermittent break in sensor C wiring at a stress point or where it passes through the firewall grommet
10%
ECM connector terminal issue causing intermittent sensor C input
Diagnostic Steps
1
Step 1: Graph sensor C PID on a scan tool during driving. Watch for brief spikes or dropouts that do not correlate with pedal input.
2
Step 2: Wiggle the pedal sensor connector and wiring while monitoring sensor C on the scan tool with key on. Note any signal disturbances.
3
Step 3: Inspect the pedal connector in the footwell for moisture, corrosion, and terminal integrity. Clean and apply dielectric grease.
4
Step 4: Check the wiring where it passes through the firewall for chafing or intermittent breaks by measuring continuity while flexing the harness.
5
Step 5: If the sensor tests intermittent, replace the accelerator pedal assembly and verify stable readings over multiple drive cycles.
Estimated Repair Cost
$130 - $500
Parts + labor, varies by vehicle and location
This code indicates the throttle/pedal position sensor/switch C circuit is exhibiting intermittent behavior. The ECM has detected brief, unexpected voltage changes in the sensor C signal that do not correspond to actual pedal or throttle movement. This typically indicates an early-stage sensor failu...
The most common cause of P0229 (Throttle/Pedal Position Sensor/Switch C Circuit Intermittent) is: Worn pedal position sensor C with intermittent contact on the resistive track producing sporadic signal changes
Typical repair costs for P0229 range from $130 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent sensor C faults can cause brief, unexpected activations and deactivations of limp mode, creating unpredictable throttle response that is concerning during highway driving or acceleration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0229 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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