Diagnostic Aids

A Code 38 in conjunction with a Code 39 or 26 would mean a problem with one or more of following components:

• Fuse or power supply circuit, brake switch or wire before splice.
• Code 38 alone is result of a wire or circuit problem between splice and control module, poor connection to control module, or possibly control module itself.

If brake switch has failed in an open state, TCC will not engage. Code 38 does not turn on SERVICE ENGINE SOON light on all models.

Fig 1: Code 38 Schematic ("A" Body With 3T40 Trans.) Brake Switch

Fig 2: Code 38 Schematic ("N" Body) Brake Switch

Fig 3: Code 38 Flow Chart Brake Switch