What causes a P2236 code?

P2236 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 P2236 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2236 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

P2236

P2236 O2 Sensor Positive Current Control Circuit Low

What it means

The Engine Control Module detects a lower than normal voltage or resistance in the O2 sensor's positive current control circuit, indicating a potential electrical short or sensor failure.