Manufacturer Code Charts: 138

VSA DTC Troubleshooting: 138

DTC 138:

Brake Pedal Position Switch Stuck OFF (Software)

1. Turn the ignition switch to LOCK (0).

2. Check the No. 12 (15 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES -

Reinstall the fuse, and go to step 3.

NO -

Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in the fuse circuit.�

3. Disconnect the brake pedal position switch 4P connector Adjustments.

4. Measure the voltage between brake pedal position switch 4P connector terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 5.

NO -

Repair an open in the wire between the No. 12 (15 A) fuse in the under-hood fuse/relay box and the brake pedal position switch.�

5. Short the SCS line with the HDS.

6. Disconnect PCM connector A (44P) Service and Repair.

7. Check for continuity between brake pedal position switch 4P connector terminal No. 2 and PCM connector A (44P) terminal No. 40.





Is there continuity?

YES -

Go to step 8.

NO -

Repair an open in the wire between the PCM and the brake pedal position switch.�

8. Do the brake pedal position switch test Testing and Inspection.

Is the switch OK?

YES -

Go to step 9.

NO -

Replace the brake pedal position switch Service and Repair.

9. Reconnect all connectors.

10. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

11. Start the engine, then press the brake pedal slowly and hard.

12. Check for DTCs with the HDS.

Is DTC 138 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 46P connector. If necessary, substitute a known-good VSA modulator-control unit Service and Repair, then recheck. If the VSA modulator-control unit was substituted, go to step 1.

NO -

If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair.�