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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 781 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE WILL NOT CRANKCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Verify no hybrid powertrain control module or engine control module (ECM) DTCs are set that would disable high voltage or that identify a gear selector switch concern.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Observe the battery energy control module Contactor System Status parameter. You should observe contactor status as Closed.
- If the parameter displays Precharge Inhibit, the battery energy control module is operating in the precharge resistor protection mode and high voltage has been disabled for 35 minutes. Observe the battery energy control module Precharge Wait Time parameter to determine the amount of disable time remaining. Turn the ignition OFF and wait the applicable amount of time before attempting to crank the engine.
- Observe the hybrid powertrain control module IMS Range parameter display with a scan tool. The display should indicate Park or Neutral.
- If the display does not indicate Park or Neutral, adjust the range selector lever cable. Refer to Range Selector Lever Cable Adjustment .
- Verify that serial data gateway module DTC B009F is not set.
- If B009F is set, refer to DTC B009F .
- Observe the serial data gateway module Hybrid Crash Status parameter. If the vehicle has not been involved in a collision the parameter should display No Crash.
- If the parameter displays Crash Detected and/or the vehicle has been involved in a collision the high voltage system should be inspected for damage before the high voltage system is re-enabled. Refer to High Voltage System Inspection .
- Verify the vehicle has not been in a collision that resulted in supplemental inflatable restrain (SIR) deployment.
- If SIR deployment has occurred the high voltage system should be inspected for damage before the high voltage system is re-enabled. Refer to High Voltage System Inspection .
- Observe the battery energy control module Hybrid Battery Pack Calculated voltage parameter with a scan tool. You should observe greater than 305 volts.
- If the hybrid battery voltage is less than the specified value, attempt to charge the Hybrid Battery. Refer to Jump Assist .
- Observe the battery energy control module Hybrid Battery state of charge parameter with a scan tool. You should observe greater than 20 % hybrid battery state of charge.
- If the hybrid battery state of charge is the same or less than the specified value, attempt to charge the Hybrid Battery. Refer to Jump Assist .
- Turn the ignition to Crank. The engine should instantly start and run.
- If the engine does not crank but audible transmission noise is observed while cranking, inspect the transmission for internal component failure. A seized engine or accessory drive could cause transmission damage during engine crank.
- If the engine does not crank and no audible transmission noise is observed, continue with diagnosis.
- Perform the hybrid powertrain control module scan tool Clear 300V Impact Detection DTC output control. Turn the ignition OFF for 60 seconds.
- Turn the ignition to Crank. The engine should instantly start and run.
- If the engine cranks, the DTC Information for serial data gateway module DTC B009F had been previously cleared without performing the scan tool output control. Ensure DTC B009F runs and passes.
- If the engine does not crank, continue with diagnosis.
- Perform the hybrid powertrain control module scan tool Clear 300V Present DTC output control. Turn the ignition OFF for 5 minutes.
- Turn the ignition to Crank. The engine should instantly start and run.
- If the engine cranks, the DTC Information for DTC P0C76 had been previously cleared without performing the scan tool output control. Ensure DTC P0C76 runs and passes.
- If the engine does not crank, replace the drive motor generator power inverter module.
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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.