What causes a P20BA code?

P20BA 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 P20BA code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P20BA 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

Log in Sign up

OBD-II

P20BA

Reductant Heater Control Circuit Performance

What it means

The ECM detects that the DEF tank heater is not drawing the expected current or the temperature is not rising as requested.

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

Log in Sign up free