What causes a P1288 code?

P1288 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 P1288 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1288 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

P1288

AMF CAN sensor supply voltage out of range

What it means

The Aftertreatment Management Function (AMF) or Aftertreatment Sensor Hub (ASH) has detected that the internal or domestic CAN sensor supply voltage is above or below the acceptable operating threshold (typically 5V or 12V depending on the specific module architecture).