P0608 – Control Module VSS Output

Description

The ECM detects a malfunction in the vehicle speed signal output circuit.

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Symptoms

  • Speedometer issues
  • Harsh shifting
  • ABS light

Causes

  • Faulty ECM
  • Wiring issues
  • Poor grounds

Diagnosis

  • Monitor VSS output
  • Inspect wiring
  • Check ECM power

Repair

  • Repair wiring
  • Replace ECM