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 MANUALSCHEVROLET2006SUBURBAN K1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 952 (IMMOBILIZER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B302ACIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Suburban K1500, 5.3 Z
Circuit/System Verification
2006 Chevrolet Suburban K1500, 5.3 ZSECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the OnStar system is operating properly. Refer to OnStar Symptom Diagnosis .
- With a master vehicle key, turn the ignition ON.
- Observe the security indicator. After approximately 10 minutes, the indicator will turn off.
- Turn the ignition OFF and wait 5 seconds.
- Repeat steps 2-4 two more times for a total of 3 cycles or 30 minutes.
- With a master vehicle key, turn the ignition ON. The start disable will now be cleared.
- With a scan tool, clear any DTCs.
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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.