What causes a P1698 code?

P1698 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 P1698 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1698 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

P1698

Voltage reference 4 minimum range fault

What it means

The ECM has detected that the specific 5V reference circuit '4' is below the minimum allowable voltage range, usually indicating the circuit is being pulled to ground.