What causes a P128A code?

P128A 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 P128A code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P128A 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

P128A

AMF CAN sensor burn off failed

What it means

The Particulate Matter (PM) sensor, often called the 'soot sensor', failed to perform its internal self-cleaning 'burn-off' process via its integrated heating element.