My truck light came on. After doing some research I found I needed a new gas cap. After buying a cheap one in the store the light didn't go away. After further research stated it needed to be a GM product so I found this on Amazon, switched them out and light is gone!

Cap fit perfectly, but the plastic retention cable did not. Cable was too long and gets in the way when screwing cap back on. And the plastic cable has a 'tee' molded into the distant end which is supposed to be inserted into a hole located just outside of the fuel spout. The 'tee' is too small for the hole and the cable falls out every fourth or fifth time fueling and the cap falls to the ground and inevitably rolls underneath the vehicle. What kind of design is that? My original had a 'screw eye' in the end of the cable that was attached to the vehicle with a screw. Never in gen years did it ever 'fall out' allowing the cap to hit the ground. Come on guys ..

In all fairness, the last one I bought fit as well, but it wouldn't seal and by the time I figured that out, the 30 days had expired. I guess it helps to get the real, OEM parts. Either way, this was reasonably priced and worked like a charm, no more check engine light.

I purchased this replacement OE gas cap for my 08 Yukon Denali. My engine light came on from a P0442 Small EVAP Leak code. I researched this code and learned that unless there is a problem filling the gas tank with continual vapor locking, a majority of the time the gas cap is the culprit. (Note: If you are having trouble filling the tank, it's most likely a vent valve problem). I always tighten my cap three clicks, so it wasn't loose. The rubber gasket also looked ok, but I guess after 113K miles it was no longer properly sealing. I replaced the cap and used my OBDII scanner to clear the code. FYI -- It took nearly 500 miles and one week of driving for all the vehicles monitors to test and set to "Ready" status. You can pick up an Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles scanner for under $20 on Amazon and it's worth its weight in gold. I was able to check the monitors and the Evap monitor is the last to test. One week since I replaced the cap, finally the Evap monitor did its test and set to "Ready" status with NO CODES. This means the cap was the culprit. This cap through the dealer would have definitely cost more and I would have been paying a diagnostic fee of $95 on top of the part.

Saved me hundreds of dollars. My check engine light kept going off. I guess there was a leak in my original gas cap. The code reader was telling me I need to replace an expensive part. Instead, I replaced the gas cap. No more check engine light.