Powertrain Controls - ECM/PCM

Code 38:

Brake Input Circuit:

CIRCUIT DESCRIPTION:

The PCM monitors the status of the brake switch circuits thru PCM terminal "BA5."

Code 38 will set if:

^ No Code 24 is present.
^ Vehicle speed has been above 35.0 mph for 10.0 seconds and back to 0 mph five times.
^ Status of CKT 420 has not changed from "NO" to "YES" as seen on the Tech 1.

DIAGNOSTIC AIDS:

A code 38 in combination with a code 26 would mean a problem with one or more of the following components. Fuse, CKT 639, brake switch or wire before the splice.

A single code 38 is the result of a wire or CKT 420 problem between the splice and the PCM, poor connection to PCM connector, or possibly the PCM.

NOTE: If the brake switch has failed in an open state. TCC will not engage. When code 38 is set, the PCM will not allow 4th gear or TCC operation. Code 38 does not turn "ON" SES light.