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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P2228 or P2229 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
  • If DTC P0652 or P0653 are set, diagnose those DTCs first. Refer to DTC P0652 or P0653 .
  • If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  1. Turn ON the ignition with the engine OFF.
  2. Observe the BARO parameter with a scan tool.
  3. Compare the BARO value to the range specified in the altitude vs. barometric pressure table.
    • The BARO parameter should be within the range specified in the altitude vs. barometric pressure table.
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