Rick's Free Auto Repair Advice

GM Inoperative Purge Solenoid

TSB on GM Inoperative Purge Solenoid

GM has issued a service bulletin #18029 and special coverage for a GM Inoperative Purge Solenoid on the vehicles listed below.

A GM inoperative purge solenoid can lead to excessive fuel vapors entering the combustion chamber from the fuel tank. This results in a no-start, idle stall, and possible drivability issues such as hesitation. You may notice a check engine light, a ticking noise, and a variation in idle speed. The condition is most noticeable right after filling up the vehicle with gas or while coming to a stop.

Vehicles affected by service bulletin #18029

2015 Buick Enclave, LaCrosse
2015 Cadillac ATS, CTS, SRX, XTS
2015 Chevrolet Camaro, Caprice, Colorado, Equinox, Impala, Traverse
2015 GMC Acadia, Canyon, Terrain

Special coverage for GM Inoperative Purge Solenoid

GM is covering the purge valve replacement for free for a period of 10 years or 120,000 miles (193,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. They will replace the purge valve with an updated version, part #12690512 Evaporative Emission Canister Purge Solenoid Valve

Is your vehicle covered by this service bulletin?

If you have any of the symptoms listed above, the technician will perform the following Purge Solenoid Valve test.

1. Ignition ON, engine OFF.
2. Command the EVAP Purge/Seal function to System Seal or Not Venting with a scan tool to seal the EVAP system.
3. Start the Engine.
4. Observe the Fuel Tank Pressure Sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7V after 90 seconds.

If the reading is NOT within specifications, then the purge valve is nor sealing and must be replaced with the updated part. The repair will be free if you are within the special coverage period.

If the readings are within spec, then the problem is not caused by the purge valve.

©, 2018 Rick Muscoplat

Posted on by Rick Muscoplat

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