LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes) >> ECM/Pcm Code Charts >> Code 38, TCC Brake Switch Error >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 38, TCC Brake Switch Error: Notes

WARNING: This page is about a different car, the 1994 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.

PCM monitors activity of the normally-closed brake switch. Switch opens when brake pedal is applied.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks for voltage at brake switch.
  2. Simulates brake switch closed or brakes off. Checks TCC brake switch circuit between PCM and switch.
  3. Checks circuit between TCC brake switch and PCM. Test opens TCC brake switch, simulating brakes applied.