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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1374 (ENGINE CONTROLS AND FUEL - 4.8L, 5.3L, 6.0L, 6.2L - DTC P0230 TO DTC P0690)DTC P0351-P0358CIRCUIT/SYSTEM TESTING
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Circuit/System Testing

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the engine running, monitor the Cylinder 1-8 IC Circuit Status parameters with a scan tool.
    • If a short to GND or Open status test displays FAULT, test for an open/high resistance or short to ground on the affected IC circuit terminal C.
    • If a short to volts status test displays FAULT, test for a short to voltage on the affected IC circuit terminal C.
    2. IMPORTANT: A high resistance on any IC circuit can cause a misfire condition before DTCs P0351-P0358 set.
  2. Exchange the affected ignition coil/module with the ignition coil/module of a cylinder that is not affected.
  3. Start and run the engine. With a scan tool, monitor the IC circuit parameters and the Misfire Current counters.
    • If the circuit status fault identified or the misfire transfers with the ignition coil/module, replace the ignition coil/module assembly.
    • If the circuit status fault identified or the misfire does not transfer with the ignition coil/module, replace the ECM.
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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.