What causes a P1020 code?

P1020 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 P1020 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1020 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

P1020

BPV CAN sensor unspecified actuator fault

What it means

Bypass Valve (BPV) CAN Sensor Unspecified Actuator Fault - Indicates a communication or performance mismatch between the engine controller and the turbocharger/intake bypass valve actuator.