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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 354 (ANTI-LOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2747: TRACTION CONTROL SWITCH CIRCUIT LOWTEST DESCRIPTION
1999 GMC Forward Control 5.7 R, Automatic
Test Description
1999 GMC Forward Control 5.7 R, AutomaticSECTION Test Description
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2. Tests for the normal state of the TCS switch using a scan tool.
- 3. Tests if the BCM is able to detect a change in TCS switch state.
- 4. Tests for a stuck or shorted TCS switch. If the TCS switch is stuck or shorted, the state will change from ON to OFF when the TCS switch is disconnected.
- 5. Tests for a short to ground in the TCS switch signal circuit.
- 8. When the BCM is replaced, use a scan tool to perform the setup procedure for the BCM. Refer to BODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATION in BODY CONTROL SYSTEM .
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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.