P0449 code on 08 Trailblazer

Mike N

Administrator
Staff member
Lifetime Gold Member
Jan 13, 2002
3,077
Spencerport, NY.
449 is an open or short in the vent solenoid circuit. 99% of the time we find the solenoid itself is junk.

Iirc it's mounted above the spare tire on that model.
 

CorkyE

Veteran Member
Lifetime Gold Member
Nov 4, 2004
11,869
Ringgold, GA
449 is an open or short in the vent solenoid circuit. 99% of the time we find the solenoid itself is junk.

Iirc it's mounted above the spare tire on that model.
Don't know for sure where it's mounted on the Trailblazer, guess I'll find out. From what I've been reading, it's likely the solenoid. I ordered one (GM brand) from Rock Auto so I'll toss it in when it gets here. I checked the gas tank cap, gasket looked okay. I sprayed and wiped some Fluid Film on the gasket just for S & G's. This car has never been in salt or snow, so it's not gunked up underneath. Thanks Mike, I really thought this would be an O2 sensor issue. :D
 

Knuckle Dragger

Mayor of Simpleton
Staff member
Lifetime Gold Member
Nov 2, 2002
16,949
Waddell AZ
Thanks Mike, I really thought this would be an O2 sensor issue. :D

I'm sure it still needs one.

FYI, if it was the cap you would have got a code for a leak. I think the valve will fix it. On the full size stuff the updated solenoid requires a jumper harness because the connector changed. So if it's looks wrong that might be the case here too.
 

camarolife78

Veteran Member
Jul 22, 2014
549
Gardner, KS
The hard start when refueling means the valve is stuck open allowing the fuel vapors to flood the engine, thus causing the hard start. Good job in purchasing the delco brand from RA. The parts store china brand parts never last. At the shop we only use OEM emissions parts because the aftermarket never lasts.
 

CorkyE

Veteran Member
Lifetime Gold Member
Nov 4, 2004
11,869
Ringgold, GA
Well I initially ordered the wrong Evap Emission Solenoid. There a two of them, one on the engine and one by the gas tank. I needed one by the gas tank (ACD#25950499). I don't have a lift so it's a lot easier to access by dropping the spare tire when working on your back. Not a big deal after that. I cleared the codes and light is staying off.
 

Knuckle Dragger

Mayor of Simpleton
Staff member
Lifetime Gold Member
Nov 2, 2002
16,949
Waddell AZ
Well I initially ordered the wrong Evap Emission Solenoid. There a two of them, one on the engine and one by the gas tank. I needed one by the gas tank (ACD#25950499). I don't have a lift so it's a lot easier to access by dropping the spare tire when working on your back. Not a big deal after that. I cleared the codes and light is staying off.


The one by the engine is the purge, the one in the tank is the vent. Little late now but thought maybe.......

Glad it's fixed.
 




Latest posts

Top