What causes a SPN 2045 code?

SPN 2045 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 2045 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2045 active.

How do I fix SPN 2045?

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 2045

SPN 2045 - Trailer Brake Control Unit Status

What it means

Indicates a communication failure or data discrepancy between the vehicle Engine Control Module (ECM/CM) and the EBS/ABS Trailer Control system via the J1939 data link.