lpguy

iTrader: (2)

tried looking it up but couldn't find a definitive answer... my 06 silverado is throwing code p0449 . i didn't change anything before it popped up. any one had this code? .not wanting to goto stealership to get it fixed

MikeGyver

iTrader: (5)

P0449 is Evaporative emission (EVAP) vent solenoid control circuit. The way your post is worded makes it sound like you didn't know what the code is. If that isn't your question, sorry then.

Mrgoodwrench3

Very common failure for this code is the Evaporative Emissions (EVAP) Canister Vent Solenoid/Valve.


1. Command the evaporative vent solenoid on/off, listen for click at the vent solenoid.

2. Check for 13-14 volts to the evaporative vent solenoid on the Orange wire with the engine running.

3. Test the evaporative solenoid resistance, solenoid disconnected. Should have 20-30 ohms.

4. If no click from the evaporative vent solenoid when commanded on with a scan tool, but the solenoid checks OK and the power feed is OK, the test the evaporative vent solenoid control wire, White.

5. Check the White wire from the PCM, pin 45, green connector, to C152, 12 pin connector, pin F, under the Underhood Bussed Electrical Center (UBEC).

The evaporative vent solenoid is back by the fuel tank.

lady3bglover

iTrader: (3)

This thread may help a little too, http://www.gmtruckclub.com/forum/sho...ge-Valve-Issue

budhayes3

iTrader: (19)

There is a TSB in reference to the P0446 and P0449 codes that outlines replacing the solenoid and relocating it's filter up the transmission tunnel to the back of the block where it meets the bellhousing. The solenoid and filter come as a kit, and a few feet of 5/8 heater hose are needed to run from the solenoid to the filter. The filter is prone to clogging with dirt and debris due to it's location. Of course, a proper diagnosis as outlined my MrGoodwrench3 will save you $120+ if the solenoid isn't the problem....fwiw, my truck currently needs this solenoid (among other things lol)