Trouble code: P1705

Detection Item "NC2" Revolution sensor circuit malfunction (direct clutch speed sensor)

Diagnostic Trouble Code Detecting Condition Output of direct clutch speed sensor (NC2) is 300 rpm or less under conditions a) and b) (2 trip detection logic) a) Vehicle speed: 32 km/hr (20 mph) or more b) Park/neutral position switch: OFF

-d

Sounds like a sensor to me. I don't know why they'd be recommending replacing the ECM - this would be like replacing your computer because the keyboard doesn't work.

I'm just reading between lines, but I bet this sensor is used to sense when to lock up the torque convertor. Most modern automatics have a lock-up mode in the torque convertor that directly couples the input and output of the transmission, bypassing the torque convertor hydraulics, when in cruise mode. This gives better mileage. Without the speed sensor working, this lock-up feature is probably disabled. It is not a huge deal, but I'd get it fixed.

- Mark

Sounds like a sensor to me. I don't know why they'd be recommending replacing the ECM - this would be like replacing your computer because the keyboard doesn't work.

I'm just reading between lines, but I bet this sensor is used to sense when to lock up the torque convertor. Most modern automatics have a lock-up mode in the torque convertor that directly couples the input and output of the transmission, bypassing the torque convertor hydraulics, when in cruise mode. This gives better mileage. Without the speed sensor working, this lock-up feature is probably disabled. It is not a huge deal, but I'd get it fixed.

- Mark

Thanks to both for reply. She probably wouldn't detect if the convertor was locked or unlocked. Agree she should get it fixed.