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Home >> Chevrolet >> 2019 >> Sonic LS, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> Tachometer Inaccurate or Inoperative >> Circuit/System Verification

Circuit/System Verification

  1. Verify no DTC is set.
    • If any DTC is set 

      diagnose DTCs first.

    • Go to next step: If no DTCs are set 
  2. Ignition ON, perform the Tachometer Gauge Sweep test with the scan tool, verify tachometer sweeps from low to high position.
    • If tachometer does not sweep 

      replace the P16 Instrument Cluster.

    • Go to next step: If tachometer sweeps properly 
  3. Engine running, verify the tachometer value matches the Engine Speed parameter on the scan tool.
    • If the value does not match 

      replace the P16 Instrument Cluster.

    • Go to next step: If the tachometer value matches the value displayed on the scan tool 
  4. Replace the K20 Engine Control Module.
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