P0228 indicates that the engine control module has detected a higher-than-expected voltage signal from the ‘C’ throttle or accelerator pedal position sensor circuit. This typically occurs when the sensor signal wire is shorted to voltage, the sensor has failed internally, or a compromised ground is causing the voltage to float high. The condition can affect engine power management and idle control.
An internal electrical fault in the sensor can cause its output voltage to remain high regardless of actual throttle or pedal position.
Damaged insulation or crossed wires can allow battery or 5-volt reference voltage to bleed onto the sensor signal line.
A broken, loose, or corroded ground path can cause the sensor signal to drift above the normal operating range.
Moisture intrusion, corrosion, or bent pins at the sensor or harness connector can alter circuit resistance and produce a high-voltage reading.
This is uncommon; the control module may misread a normal input only after all sensor and harness possibilities have been thoroughly ruled out.
You should avoid driving if possible; the vehicle may enter a reduced-power mode that limits acceleration and could be unsafe.
Not necessarily; wiring shorts to voltage and ground-side opens are equally common and must be checked before replacing parts.
PCM failure is a rare cause of this code; thorough wiring and ground testing should be completed first, as replacing the module usually does not resolve the issue.
It depends on the vehicle design; sensor ‘C’ may be located on either the accelerator pedal assembly or the throttle body, so service information should be consulted to identify the correct component.