Code Definition

P0608 — Control Module VSS Output -Signal A

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0608

P0608 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0608 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0608 fault code is set when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a malfunction in the output signal from the Vehicle Speed Sensor (VSS) circuit 'A'. The VSS is responsible for providing information about the vehicle's speed to the ECM/PCM. This data is crucial for various functions, including transmission shifting, fuel injection rates, and cruise control operation. Circuit 'A' refers to one of the paths through which the VSS sends its signal to the ECM/PCM. A malfunction in this circuit can lead to issues with the transmission shift patterns, engine ...

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