What causes a P003A99 code?

P003A99 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 P003A99 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P003A99 active.

How do I fix P003A99?

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

P003A99

Turbocharger / turbocharger supercharging control position "A" has exceeded the training threshold

What it means

Parameter limit exceeded

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

Log in Sign up free