"SMS" > wrote in message
...
> On 8/22/2013 8:33 PM, Oppie wrote:
>> Predictably, the morning that we were supposed to leave on vacation, the
>> Vue started shifting very roughly. I had filled the tank the night
>> before so suspected bad fuel. Put in a can of drygas and hit the
>> highway. About 10 miles into the 200 mile trip, the MIL light came on.
>> Pulled over and started pulling fuses (the lw300 ECU could be reset by
>> pulling the controls B+ fuse). No dice, couldn't find a fuse that would
>> turn off the light. Drove all the way with the transmission slamming
>> from gear to gear. It was like the torque converter stayed locked up.
>> Interesting that the shifter normally defaults to 3rd gear when you
>> shift to manual and you can shift up or down from there. Now the manual
>> defaults to 4th gear and the up/down buttons are not functional.
>>
>> Finally made it to destination (enduring wife's diatribes that we bought
>> a POS) and after unloading the car, fished out my AutoTap tool and
>> laptop. Showed P0842 "transmission fluid pressure sensor "A" circuit
>> Low." I haven't been able to make sense of this yet. Did a reset of the
>> fault codes and car is driving fine now. Drove it for about 50 miles
>> today and light has not come back on. It likely will so looking for
>> possible causes.
>>
>> 2009 Vue XE with 2.4L EcoTec and 4T45 base model transmission
>
> Either the sensor is flaky or pressure switch manifold is flaky.
>
> If you have an Android phone or tablet you should buy Torque Pro from the
> Play store and buy a Bluetooth ELM327 module for the OBDII socket; for
> less than $20, you'll always have an OBDII scan tool with you.
>
> <https://play.google.com/store/apps/details?id=org.prowl.torque&hl=en>
> <http://dx.com/s/142679>
>
> Unfortunately, due to Apple not supporting the proper Bluetooth protocol,
> there's no equivalent app for iOS.
>
>
I have the XP laptop we travel with and always have the Autotap reader in
the car. Bummer that iOS doesn't support the proper Bluetooth protocol since
I have an iPod Touch. There are lots of hits though if one googles for
"bluetoogh obdii" which would work with the laptop too.
Been looking for options to update from Autotap since B&B Electronics,
owner of Autotap, discontinued sales and support. It works well and can give
me live data for the engine parameters only but will show fault codes for
the entire system.

Going back to the original thread, no further hiccups since I reset the code
last Wednesday. When we get home from vacation, I'll check in with dealer.
I'll check the wiring for harness flex/abrasions and connectors for
oxidation first.

The service manual I had bought in PDF form turned out to be severely
lacking and did not have any of the fault code troubleshooting data. Only
spent $15 on it and have an agreement with the seller to upgrade to the full
set of GM DVD ROMs for a small additional payment.