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2008 Chevy Equinox P0449 Code: No Voltage at Vent Solenoid After Replacement

Model: 2008 Chevy Equinox Fault Code: P0449 Posted: 2017-10-03 22:10

Hello. I'm experiencing OBD2 fault code P0449 on my 2008 Chevrolet Equinox. I recently replaced the vent valve solenoid located near the charcoal canister, close to the fuel tank. However, the check engine light remains illuminated. When I tested the two wires leading to the solenoid, I found zero voltage. I've also checked the fuses with no success. The issue persists despite replacing fuse 16 (10A) in the instrument panel fuse block. I'm looking for guidance on what steps to take next—could this be a wiring or circuit problem? Any advice would be greatly appreciated.

Related fault codes
P0449
Comments (6)
Anonymous 2017-10-04 08:48

This appears to be a circuit-related issue. Please verify that fuse 16 (10A) in the instrument panel fuse block is intact and properly seated. Refer to this resource for more details: https://www.obd-codes.com/p0449

Anonymous 2017-10-04 13:40

Thanks for the tip—unfortunately, I've already replaced the fuse with a spare 10A one, but it didn't resolve the issue. I'm now planning to trace the wiring from the PCM/ECM. Would using a jumper wire work as a temporary test? For example, would connecting power from another cable provide enough voltage to trigger the system?

Anonymous 2017-10-06 11:03

Is there any voltage present at terminal B (pink wire) of the vent solenoid? The ignition key must be in the 'ON' or 'RUN' position for proper operation.

Anonymous 2017-10-06 11:14

Yes, I've confirmed that—there is absolutely no voltage detected at the solenoid terminals under any condition.

Anonymous 2017-10-06 12:34

Use a test light connected to the battery negative terminal. With the key in the 'ON' position, touch both ends of fuse 16 (10A) with the test light. Does it illuminate on both sides? This will confirm whether power is reaching the fuse.

Anonymous 2017-10-06 12:49

If you're not experienced in electrical diagnostics, it's best to take your vehicle to a professional garage. Simply replacing a fuse doesn't verify its functionality—you must test for voltage on both sides of the fuse to determine if there’s an issue with the fuse box or contact points. Without power at the vent solenoid, testing wires from the solenoid to the PCM is pointless since no feed exists from the fuse.