What causes a P0233 code?

P0233 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 P0233 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0233 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

P0233

Fuel Pump Secondary Circuit Intermittent Fault

What it means

The Engine Control Module (ECM) has detected an irregular signal or intermittent voltage drop from the fuel pump secondary control circuit, indicating a potential power supply or grounding issue.