Technical Dualogic P1742-1C - Selection sensor voltage out of range

[spleenharvester]

This is a 2011 Fiat 500 312 with the Dualogic (CFC328) actuator. It's done 80k miles and the dualogic system has done about 1,000,000 gear changes with no DTCs saved until today.

We were idling (either in 1st gear or neutral, we're not sure) and 'check transmission' message came up. Turned the car off and on again, error did not recur and drove home perfectly fine.

Plugged in the code reader, nothing saved in the engine. Plugged in MultiECUScan and got:

P1742-1C Selection sensor voltage out of range (intermittent)
Operating time: 212130 min
Engine speed: 706 rpm
Hydraulic circuit pressure: 45 bar
Gearbox oil temperature: 34degC
Gear requested: 1
Gear engaged: 1
Battery voltage: 13.1V

There are a few reports on Alfa Romeos with selespeed as P1742 as being the PF2C sensor at the back of the dualogic actuator, but it seems like there are a lot of subtypes of P1742 and I can't find any information on P1742-1C specifically.

Has anyone run into this before? I have cleared the code for now and will wait and see if/when it recurs.

Cheers

 

[the green vanper]

Hello,

Was the gearbox serviced by someone who knows how to do it properly?

 

[spleenharvester]

Hello,

Was the gearbox serviced by someone who knows how to do it properly?

Nope never been serviced, as far as I know it has never been removed from the car.

 

[the green vanper]

You don't have to remove it to service it. Find a workshop which really knows how to do it (it's not frequent though). It should be done on a regular basis.

 

[spleenharvester]

I've looked at this before after all the reports of Dualogic failures - there only seems to be two people in the country who can do it and it's about £600 a pop, so a bit out of budget for routine maintenance.

I'll update if the error recurs/if replacing the sensor fixes it if so.

 

[the green vanper]

about £600 a pop

I'd say not much for

80k miles and about 1,000,000 gear changes