What causes a P1694 code?

P1694 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 P1694 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1694 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

P1694

Ether fluid control PWM driver short circuit low

What it means

The ECM has detected a short to ground in the Pulse Width Modulation (PWM) circuit that controls the ether injection solenoid used for cold weather starting.