2003 Hummer H2FACTORY OEM SERVICE PROCEDURE

DTC Descriptors

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

This diagnostic procedure supports the following DTCs:

  • DTC U1881 Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Energy Storage Control Module (ESCM)
  • DTC U1882 Energy Storage Control Module (ESCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module
  • DTC U1883 Hybrid Control Module (HCM) Lost Communication With Driver Door Module (DDM)
  • DTC U1884 Hybrid Control Module (HCM) Lost Communication With Passenger Door Module (PDM)
  • DTC U1885 Energy Storage Control Module (ESCM) Lost Communication With Hybrid Control Module (HCM)
  • DTC U1886 Energy Storage Control Module (ESCM) Lost Communication With Powertrain Control Module (PCM)
  • DTC U1887 Energy Storage Control Module (ESCM) Lost Communication With Starter/Generator Control Module (SGCM)
  • DTC U1888 Hybrid Control Module (HCM) Lost Communication With Energy Storage Control Module (ESCM)
  • DTC U1889 Hybrid Control Module (HCM) Lost Communication With Body Control Module (BCM)
  • DTC U1890 Hybrid Control Module (HCM) Lost Communication With HVAC Control Module
  • DTC U1891 Hybrid Control Module (HCM) Lost Communication With Instrument Panel Cluster (IPC)
  • DTC U1892 Hybrid Control Module (HCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module
  • DTC U1893 Hybrid Control Module (HCM) Lost Communication With Powertrain Control Module (PCM)
  • DTC U1894 Hybrid Control Module (HCM) Lost Communication With Starter/Generator Control Module (SGCM)
  • DTC U1895 Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Powertrain Control Module (PCM)
  • DTC U1896 Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Starter/Generator Control Module (SGCM)
  • DTC U1897 Starter/Generator Control Module (SGCM) Lost Communication With Energy Storage Control Module (ESCM)
  • DTC U1898 Starter/Generator Control Module (SGCM) Lost Communication With Hybrid Control Module (HCM)
  • DTC U1899 Starter/Generator Control Module (SGCM) Lost Communication With Powertrain Control Module (PCM)
Factory Service Tools

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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.

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