Code P0229 indicates that the engine computer has detected an intermittent or erratic electrical signal from the 'C' circuit of the throttle pedal position sensor. This means the voltage or resistance from the pedal sensor is dropping out or spiking momentarily, which disrupts the computer's ability to accurately read driver acceleration demands.
The internal electronics of the sensor itself can degrade, causing momentary signal dropouts or erratic voltage readings.
Corroded, loose, or chafed wiring and terminals in the pedal sensor circuit can cause the electrical signal to intermittently cut out.
Physical obstructions, carbon buildup, or worn pivot points can cause the pedal mechanism to stick and send erratic data to the computer.
A poor ground or unstable reference voltage to the sensor can cause the signal circuit to read intermittently.
An internal fault within the computer causing it to incorrectly process or lose the sensor signal is extremely rare and should only be considered after all other possibilities are eliminated.
It is not recommended. The vehicle may suddenly enter reduced power mode or lose accelerator response, which creates a dangerous situation in traffic.
No, they are separate components. The throttle pedal position sensor is mounted on the accelerator pedal inside the cabin, while the throttle body position sensor is on the engine's intake.
No, replacing the engine computer is almost never the correct fix for this code. The vast majority of the time, the issue is a failing pedal sensor, a wiring defect, or a poor connection, and the PCM is incorrectly blamed.
Yes, a poor ground connection can cause the sensor's voltage signal to fluctuate erratically, triggering an intermittent circuit code like P0229.