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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1353 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P1A8B OR P1A8CCIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U

Circuit/System Testing

2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the vehicle in Park and start the engine.
  2. Place the steering wheel in the centered position. Do not rotate the steering wheel.
  3. Observe the 42V Circuit Current parameter in the APM data list on the scan tool.
    • If the 42V Circuit Current parameter is greater than 0.5 amps with no steering input, replace the power steering control module (PSCM).
  4. Rapidly rotate the steering wheel to the left and right while observing the 42V Circuit Current parameter.
    • If the 42V Circuit Current parameter is greater than 40 amps, replace the PSCM.
    • If the 42V Circuit Current parameter is less than 40 amps, replace the APM.
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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.