Diagnostic Aids
A Code 38 in conjunction with a Code 39 or 26 would mean a problem with one or more of the following components.
- Fuse or power supply circuit, brake switch or wire before the splice.
- Code 38 shown is the result of a wire or circuit problem between the splice and the control module, poor connection to the control module, or possibly the 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.