The P1574Code on a 2002 Nissan Altima indicates an issue with the ASCD vehicle speed sensor. This code appears when the ECM detects a difference between two vehicle speed signals is out of the specified range. One of the most common signs of a bad speed sensor is abnormal automatic transmission operation. If the VSS is faulty, the transmission may exhibit symptoms such as delayed shifts, hard shifts, and limited gear operation. A bad speed sensor can cause Your car to run poorly or not at all. The speed sensor, also known as the vehicle speed sensor or VSS, measures the transmission output. This data relates directly to the vehicle speed and how fast You are moving. This information is being transferred to alter the engine functions like air and fuELRatio, shifting times, and diagnostic fixes.
Deborah W
July 16, 2020
The 2002 nissan altima code p1574 means that the engine control module will receive two vehicle speed sensor signals via communication area network communication line
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