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 blown?

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 brake pedal position switch 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) or PCM connector A (49P).
: '07-09 models
: '10-11 models

7. Check for continuity between brake pedal position switch 4P connector terminal No. 2 and PCM connector A (44P) terminal No. 40 or PCM connector A (49P) terminal No. 42.
: '07-09 models
: '10-11 models

'07-09 models





'10-11 models





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 brake pedal position switch OK?

YES -

Go to step 9.

NO -

Replace the brake pedal position switch Adjustments.�

9. Substitute a known-good PCM: '07-09 models Initial Inspection and Diagnostic Overview, '10-11 models. Initial Inspection and Diagnostic Overview

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

11. 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 retest. If the VSA modulator-control unit was substituted, go to step 1

NO -

Replace the original PCM: '07-09 models Service and Repair, '10-11 models Service and Repair.�