What causes a SPN 1149 code?

SPN 1149 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 SPN 1149 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 1149 active.

How do I fix SPN 1149?

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

Log in Sign up

J1939 SPN

SPN 1149

Engine Injector Solenoid Supply Voltage 1

What it means

The voltage supplied to the first bank of fuel injectors is outside of the normal operating range.

Sign in to view symptoms, probable causes, diagnostic steps, severity, and related codes

Log in Sign up free