DTC 38

DTC 38 - TCC Brake Input Circuit:

TCC Brake Switch Wiring Circuit:

Circuit Description:

The PCM monitors the status of the TCC brake switch circuit through PCM terminal "BA5". DTC 38 will set if:
^ No DTC 24 is present.
^ Vehicle speed has been above 35 mph for 10 seconds and back to 0 mph four times.
^ Status of CKT 420 has not changed from "Released" to "Applied" or "Applied" to "Released" as displayed on the Tech 1.

DTC 38 does not illuminate the MIL (Service Engine Soon).

Diagnostic Aids:
A DTC 38 in combination with a DTC 26 would mean a problem with one or more of the following components.
Fuse, CKT 350, brake switch or CKT 420 between brake switch and splice.
A single DTC 38 is the result of an open in CKT 420 between the splice and the PCM, poor connection at PCM, or possibly a faulty PCM.

NOTICE:
^ If the brake switch has failed in an open state, TCC will not engage.
^ When DTC 38 is set, the PCM will not allow 4th gear or TCC operation.