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 527 (CELLULAR COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2476: CELLULAR PHONE SELECT SERVICE SWITCH MALFUNCTION (3 BUTTON ASSEMBLY)CONDITIONS FOR SETTING THE DTC
1999 GMC Forward Control 5.7 R, Automatic
Conditions for Setting the DTC
1999 GMC Forward Control 5.7 R, AutomaticSECTION Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- The VCIM powers the button assembly through the keypad supply voltage circuit for 11.5 ms, turns the power off, then waits for 50 ms and sees a voltage value greater than 1.8 volts on this circuit.
- The above conditions are present for greater than 300 ms.
RENDER: 1.0x
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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.