P0229
Throttle/Pedal Position Sensor/Switch C Circuit Intermittent
The appearance of the standard OBD2 trouble fault code P0229 is an indicator that your vehicle ECU triggered a threshold alert for "Throttle/Pedal Position Sensor/Switch C Circuit Intermittent". Understanding the root component breakdown helps avoid expensive diagnostic fees.
Driver's Summary
P0229 is triggered when the PCM detects an abnormal condition associated with throttle/pedal position sensor/switch c circuit intermittent. The most common signs are intermittent loss of throttle response, check engine light. This is not a code to ignore — the underlying fault can rapidly worsen and lead to costly repairs if driving continues.
Symptoms
Intermittent loss of throttle response, check engine light
Common Causes
- Loose wiring connection at the pedal
- Worn internal sensor tracks
- Moisture in the connector
- Vibration causing short
How to Fix
- 1 Clean and secure connector tightly
- 2 Replace pedal assembly
- 3 Use dielectric grease
- 4 Repair chafed wiring
Technical Explanation
P0229 is stored after the control module confirms the fault over multiple ignition cycles, ruling out transient electrical noise as the cause. For injector-specific codes, the ECM monitors the injector control circuit voltage drop during each pulse; a shorted or open injector presents a characteristic resistance signature that differs measurably from a healthy unit. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
This fault carries real mechanical risk. The root causes — including loose wiring connection at the pedal — can trigger a chain reaction of component failures if the vehicle continues to be driven. Have it towed or drive directly to a shop without delay.
Mechanic's Pro Tip
Before replacing any component on P0229, spend 5 minutes inspecting the wiring harness and connector first — corrosion, chafed insulation, and backed-out pins cause the majority of these faults and cost nothing to fix. Use a multimeter to measure voltage drop across the connector pins under load; anything above 0.1V indicates excessive resistance that will cause intermittent failures even after replacing the sensor.
Connector repair: 50; Pedal replacement: 150 - 350