Code E038, Brake Switch Circuit

The ECM monitors the status of brake switch circuits through ECM terminal BC4. Code E038 will set under the following conditions:

• Code E024 is not present.
• Vehicle speed has been greater than 35 MPH and back to zero MPH several times
• Status of circuit No. 420 has not changed state high to low

Test Number 1)  This step checks for battery voltage available for circuit No. 420.

2) Checks fuse, switch and circuit for battery voltage.

Fig 1: Code E038: Circuit Diagram

Fig 2: Code E038: Flow Chart Brake Switch Circuit