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Home >> Buick >> 2012 >> Regal GS, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Verify no DTC is set.
    • If any DTC is set, diagnose this first.
  2. Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that all gauges sweep from their low to high position.
    • If any gauge does not sweep, replace the P16 Instrument Cluster.
  3. Drive the vehicle, verify the speedometer gauge value matches the Vehicle Speed parameter on the scan tool.
    • If the value do not match, replace the P16 Instrument Cluster.
  4. Drive the vehicle, verify the odometer display, the displayed distance counts up while driving.
    • If the odometer displays only "----" (dashes), go to circuit/system testing.
    • If the odometer display does not count up, verify the scan tool Body Control Module Odometer parameter and scan tool Engine Control Module Odometer parameter are functioning correctly. If the Engine Control Module Odometer parameter does not count up while driving, replace the K20 engine control module. If the Body Control Module Odometer parameter does not count up while driving, replace the K9 BCM. If the K9 BCM and K20 Engine Control Module are working correctly, replace the P16 Instrument Cluster.
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