First check engine light, manual transmission?

[Ungwei]

Haven't noticed anything strange actually driving, but I had my first check engine light, along with onstar saying the transmission didn't pass the diagnostic test. Guess I'll need to be calling the service department, but anyone have any advice? Never had any check engine light problems before.

I got this email yesterday prior to noticing any check engine light

 

[RDATLTE]

Haven't noticed anything strange actually driving, but I had my first check engine light, along with onstar saying the transmission didn't pass the diagnostic test. Guess I'll need to be calling the service department, but anyone have any advice? Never had any check engine light problems before.
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Do you have a code reader? If not, your local auto parts store should be able to either read your codes or, let you borrow a code reader.

 

[Ungwei]

Do you have a code reader? If not, your local auto parts store should be able to either read your codes or, let you borrow a code reader.

Unfortunately not, I'll go and pick one up tomorrow.

 

[Ungwei]

So I was actually able to get onstar to check the codes for me, P317C and P317D

Doesn't seem like a great thing... no flashing, so no misfires it seems at least

 

[Scalarrthu]

You obviously weren't driving it hard enough!!!

 

[RDATLTE]

You obviously weren't driving it hard enough!!!

Too soon?

 

[soulsea]

Well shit.

 

[Scalarrthu]

Too soon?

I forgot to put an "LOL" after that. I hope he doesn't take it the wrong way.

 

[Ungwei]

You obviously weren't driving it hard enough!!!

Clearly I'm too delicate with my new cars! Think I should worry about driving it tomorrow? Should I try to bring it back to the dealership tomorrow or what?

 

[Scalarrthu]

Clearly I'm too delicate with my new cars! Think I should worry about driving it tomorrow? Should I try to bring it back to the dealership tomorrow or what?

If it were me I'd go get that code reader and reset it...and since you said it was driving okay, I wouldn't be afraid to drive it. Then if the check engine light came back on I'd make my way to the dealership. Either way, I'd rather drive it to the dealership than have Road Side send a tow truck for it. Just my opinion.

 

[Ungwei]

If it were me I'd go get that code reader and reset it...and since you said it was driving okay, I wouldn't be afraid to drive it. Then if the check engine light came back on I'd make my way to the dealership. Either way, I'd rather drive it to the dealership than have Road Side send a tow truck for it. Just my opinion.

That's a great idea, I'll try the reset first, and so long as nothing feels off and it doesn't come back on, I'll just monitor it. Will keep you guys posted.

 

[RDATLTE]

I’ve had problems resetting with the tool. Unhooking the battery overnight has worked for me.

 

[mkrup]

So dumb thing to check that often triggers a check engine light: the fuel cap. Screws up the pressure in the fuel line and can make the engine think a whole bunch of other things are going wrong when it's really nothing. Might also just reset on its own after leaving it overnight, you never know.

I'm 120 miles into a road trip with another 150 to go tomorrow, and so far so good. I have to say, this is the most confidence inspiring car I've ever had on the highway--and that's after having BMW and Audi products. Today should've been a nightmare running north from the front edge of the storm with terrible weather and road conditions, but it was almost serene. Can't wait to get off the highway and onto more challenging back roads--and hopefully with better weather!

In any case, hopefully the light is just a fluke. That said, never hurts to pop by the dealer, let them take a look, and at least put them on notice.

 

[Ungwei]

I’ve had problems resetting with the tool. Unhooking the battery overnight has worked for me.

Is that safe to do? Will it mess up the infotainment and

So dumb thing to check that often triggers a check engine light: the fuel cap. Screws up the pressure in the fuel line a can make the engine think a whole bunch of other things are going wrong when it's really nothing. Might also just reset on its own after leaving it overnight, you never know.

I'm 120 miles into a road trip with another 150 to go tomorrow, and so far so good. I have to say, this is the most confidence inspiring car I've ever had on the highway--and that's after having BMW and Audi products. Today should've been a nightmare running north from the front edge of the storm with terrible weather and road conditions, but it was almost serene. Can't wait to get off the highway and onto more challenging back roads--and hopefully with better weather!

In any case, hopefully the light is just a fluke. That said, never hurts to pop by the dealer, let them take a look, and at least put them on notice.

This was the first thing I thought until I opened the gas door up and saw that it was a no cap design! Hoping it goes away tomorrow.

 

[RDATLTE]

Is that safe to do? Will it mess up the infotainment and

This was the first thing I thought until I opened the gas door up and saw that it was a no cap design! Hoping it goes away tomorrow.

I haven’t had any problems doing it. I believe it’s in the trunk. If so, place a rag or something so that the trunk doesn’t latch closed.

 

[BenBaad]

Personally, I’d probably take it to the dealer. Brand new car, don’t know what requirements there are for the warranty and what not.

 

[arod221]

if it were the gas cap (which OP stated already that there isn't one) the code would be for the evap system not the transmission....thats two totally different things

 

[mkrup]

if it were the gas cap (which OP stated already that there isn't one) the code would be for the evap system not the transmission....thats two totally different things

The detail for the code talks about variable valve timing, fuel delivery, and potential engine misfires. Evap probably would make more sense if it were gas cap, but whoever gave that code a heading of "transmission malfunction" must've been smoking something

 

[poor-sha]

Any chance your battery was low? I know the code says transmission but given that it's a manual I wonder if that is a catch-all the also includes the differential. I know the eDiffs have issues if battery voltage is low so it's possible it tried to do something with the eDiff and couldn't because of low voltage.

 

[RDATLTE]

Any chance your battery was low? I know the code says transmission but given that it's a manual I wonder if that is a catch-all the also includes the differential. I know the eDiffs have issues if battery voltage is low so it's possible it tried to do something with the eDiff and couldn't because of low voltage.

Good point. These cars are very voltage sensitive.