What causes a SPN 3145 code?

SPN 3145 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 3145 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3145 active.

How do I fix SPN 3145?

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

J1939 SPN

SPN 3145

J1939 SPN 3145 — Body/Chassis parameter

What it means

The SPN 3145 code is a generic indicator for a 'Body/Chassis Parameter' error. It typically points to a communication failure or data out-of-range error originating from the vehicle's body controller rather than the engine itself.