What causes a P0636 code?

P0636 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 P0636 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0636 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

P0636

P0636 Power Steering Control Circuit Low

What it means

Indicates the electronic control unit detected a low voltage condition in the power steering pressure sensor or control circuit. This affects the variable effort power steering or hydraulic pressure monitoring systems.