What causes a P1693 code?

P1693 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 P1693 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1693 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

P1693

Ether fluid control PWM driver open/short high

What it means

P1693 indicates a malfunction in the Pulse Width Modulation (PWM) control circuit for the ether injection system, used for cold starting. The ECM has detected either an open circuit or a short to a voltage source.