What causes a P1136 code?

P1136 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 P1136 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1136 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

P1136

WRAF heater CJ125 short-to-ground fault

What it means

The P1136 code indicates that the ECM has detected a short-to-ground in the heater control circuit of the Wide-band Ratio Air-Fuel (WRAF) sensor, specifically related to the CJ125 interface chip.