donbrew

I think he meant for the P2271, more likely new #2 O2 sensor. If the wires to the trans are ok, a ATF change has a slim chance to fix it, otherwise new solenoids are in order.
The P0700 just means to look for the P0752.

Oldblue

P2271 code the o2 sensor, heck a dying battery can cause shifting problems!

flstss

Yeah I know one thing can cause something else. I put LEDs in the 3rd brake light and the cruise control stopped working.

Lonwane

I have LED's in the 3rd CHMSL and my cruise works.
I did use LasFit canbus 921 bulbs.
They were a bit pricey but I'm happy.

flstss

I used them also but it still threw the code

Oldblue

So put the incandescent 921’s back in and test them, possibly the led 921’s need to be flipped in the sockets to get them to work.

donbrew

The computer reads the RESISTANCE of the CHMSL when it activates the cruise control. The cruise control won't work unless the CHMSL has been activated first, you don't notice that if you have an automatic trans because it won't shift out of park if your foot is not on the brake pedal.
LED lights have very little to no resistance without a resister either built in or added. LEDs with a built in resister are usually labelled "OBD2 compliant" for that reason.

flstss

Ok no more on the led bulbs. That was a bit of a tangent
the problem is the transI just got home and I used my blue driver scanner, here are the codes that I got before they came from AutoZone. P0700, p0751, p 0752, p0974, p2271.
So I know the p0700 means look for the other transmission codes. So the blue driver says respectively shift solenoid a performance/stuck off, shift solenoid a stuck on, shift solenoid a control circuit high. And I know the 2271 is to do with the O2 sensor being rich.
So there's an issue with the shift solenoid ACan either be a wire issue or most likely? The solenoid itself is bad.
I changed the transmission fluid in the beginning of February with a new filter, pain in the butt without a dipstick. I know that little side mounted site plug is the key issue there to checking the fluid.
So I'm going to climb under there tomorrow check the fluid level check all the wires that I could see from the outside if nothing seems to be damaged then I guess if I am going to do this open up the side of the trans I might as well change the solenoids I have access to in there rather than just look at the wires correct?. Does anyone have the correct part numbers for those solenoids the 2009 HHR Lt. that's the 2.2L.
Anyone have a rough idea of how long this job will take? I know my way around the toolbox pretty well I used to have a performance shop when I was younger. Still have my 70 El Camino with a 350 / 383 stroker with a 671 supercharger Richmond 6-speed overdrive transmission and 250 horsepower nitrous.
Thanks for the help in advance. Plus to all that have chimed in with their helpful comments.

Oldblue

https://www.chevyhhr.net/forums/driv...olenoid-61313/


part numbers, photos and loads of information in this thread!

heathenhhr

sounds like the problem I had, intermittent hard shift from 1-2, and then eventually 2-3 as well... it's my daily, and I have no good backup, so I bit the bullet and paid a shop to do the solenoids before they fully failed, was not cheap (over $1K), but they did it in about a day (or two, it was the weekend) for me... I know a bit, but not enough to be digging into a transmission by myself

if you want to shoot me the last 8 of your VIN I can look up the GM #s for your trans, but I won't be back at work until Monday, if you wanna wait that long