Code Definition

P1574 — Cruise control vehicle speed sensor circuit fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1574

P1574 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1574 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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.

P1574 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the vehicle speed signal used by the cruise control system, known on these Nissan and Infiniti vehicles as ASCD. The cruise control unit or Engine Control Module relies on a vehicle speed signal to hold the set speed, and on many of these vehicles it compares speed information from more than one source, such as the combination meter or ABS and the transmission output, to confirm it is valid. DTC P1574 is set when the speed signal is missing, out of range or does not agree between sources while cruise control is active. With this fault the cruise control will not set or wil...

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