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 K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1242 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSTARTER SOLENOID DOES NOT CLICKCIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Verification
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, verify that no starter relay, clutch pedal position sensor, brake pedal position sensor, theft deterrent, or automatic transmission DTCs are set that would cause the ECM to disable starting.
- If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, observe the scan tool BCM Current Power Mode parameter. Place ignition switch in the crank position, the parameter should display Crank Request.
- If not the specified value, refer to Power Mode Mismatch
- Ignition ON, observe the scan tool ECM clutch pedal parameter, verify the scan tool parameter displays Applied / Released while depressing and releasing the clutch pedal.
- If the clutch pedal parameter does change. Refer to clutch pedal position sensor learn procedure. Clutch Pedal Position Sensor Learn
- Transmission range selector in park, verify the scan tool ECM PNP Switch and TCM IMS parameters display Park/Neutral.
- If the TCM IMS parameter does not indicate Park/Neutral. Refer to Transmission Internal Mode Switch Logic
- If the ECM Park/Neutral parameter does not indicate Park/Neutral. Refer to ECM Park Switch Circuit Malfunction (6L50/6L80/6L90) .
- Transmission range selector in park or neutral, attempt to start the vehicle. The starter relay should click and the engine should begin cranking.
- If the crank relay does not click or the engine does not crank, refer to Starter Relay Circuit Malfunction .
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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.