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Home >> Chevrolet >> 2007 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P2228 or P2229 >> Circuit/System Verification

Circuit/System Verification

IMPORTANT: If DTC P0641 or P0651 are set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  1. Ignition ON, observe the BARO parameter with a scan tool.
  2. Compare the BARO value to the range specified in the altitude vs. barometric pressure table.
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