What causes a P0037 code?

P0037 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 P0037 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0037 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

P0037

HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

What it means

The engine control module (ECM) detects a low voltage condition in the oxygen sensor heater control circuit, indicating a potential break, short, or failed heating element.