Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1997FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - P SERIESDIAGNOSTIC TROUBLE CODESDTC C0081: STOPLIGHT SWITCH ALWAYS CLOSED OR SHORTEDDIAGNOSTIC PROCEDURES
1997 Chevrolet Forward Control 5.7 R, Automatic
Diagnostic Procedures
1997 Chevrolet Forward Control 5.7 R, AutomaticSECTION Diagnostic Procedures
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK . After performing diagnostic system check, go to next step.
- Turn ignition on. Using scan tool, select DATA LIST function. Check the status of the stoplight switch while applying and releasing brake pedal. If scan tool indicates switch is closed (pedal not applied) at all times, go to next step. If not, go to step 4).
- Turn ignition off. Disconnect stoplight switch connector. Turn ignition switch to RUN position. Using scan tool, check status of stoplight switch. If scan tool indicates switch is closed (pedal not applied), go to step 7). If not, go to step 8).
- If scan tool indicates that switch is open (pedal applied) at all times, go to next step. If not, go to step 7).
- Turn ignition off. Disconnect 10-pin EBCM harness connector. Turn ignition switch to RUN position. Using DVOM, check voltage between ground and terminal "C" of 10-pin EBCM harness connector. If voltage reading is greater than 10 volts, go to next step. If not, go to step 8).
- Turn ignition off. Reconnect all harness connectors. Turn ignition switch to RUN position. Select DATA LIST function on scan tool. Using scan tool, check status of stoplight switch while applying and releasing brake pedal. If scan tool indicates switch is open (pedal applied) at all times, go to step 9). If not, go to next step.
- Malfunction is intermittent. See DIAGNOSTIC AIDS. After performing necessary repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Repair faulty stoplight switch or open in stoplight switch circuit between EBCM and stoplight switch. See WIRING DIAGRAMS . After repairs, perform DIAGNOSTIC SYSTEM CHECK .
- Replace EBCM. After replacing EBCM, perform DIAGNOSTIC SYSTEM CHECK .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.