Monitor Description

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This DTC indicates that the 1-2 shift valve in the transmission valve body assembly is locked in the direction the spring compresses.

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to the shift solenoid valves in the transmission valve body assembly.

The ECM calculates the "actual" transmission gear by comparing the signals from the transmission revolution sensor (NT) and the transmission revolution sensor (SP2). The ECM can detect many mechanical problems in the shift solenoid valves, transmission valve body assembly, transmission clutches, brakes and gears. If the ECM detects that the actual gear position and the commanded gear position are different, it will illuminate the MIL and store a DTC.