What causes a P0651 code?

P0651 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 P0651 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0651 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.

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OBD-II

P0651

Sensor Reference Voltage B Circuit Open

What it means

Secondary 5-volt reference circuit failure, leading to multiple sensor input errors and potential limp mode.

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