What causes a P0229 code?

P0229 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0229 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0229 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0229

Throttle/Pedal Position Sensor Switch C Circuit Intermittent

What it means

The Engine Control Module (ECM) detects an intermittent or erratic voltage signal from the Accelerator Pedal Position (APP) sensor circuit C. This disrupts the signal correlation required for safe engine torque management.