What causes a P020656 code?

P020656 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 P020656 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P020656 active.

How do I fix P020656?

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

Log in Sign up

OBD-II

P020656

Cylinder 6 nozzle "A"

What it means

Invalid / incompatible configuration

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free