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1999 Escalade, 2004 CTS, 2003 ESV, Now 2008 Escalade
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1,243 Posts
Discussion Starter #1
I sometimes get a message on my DIC saying to "tighten gas cap" I bought a new one not from dealer, from autozone. Sometimes when I go in the morning to drive I get the message it use to happen once a year now it happens almost every week now.
 

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Cadillac
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233 Posts
Check the plastic connecting strap that keep the cap from falling to the ground. I have had a slightly loose cap several times due to the strap pulling counterclockwise on the cap. I always hold the strap back when I tighten the cap so that the strap is pushing the cap tighter instead of the opposite. Also carefully inspect the top of the filler neck.
 

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2012 Escalade, 2014 SRX
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13,353 Posts
We seen this at our shop and now only use factory cap caps and have no more issues, cost more but cheaper in the long run because of no more issure
 

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Escalade EXT
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50 Posts
Most times the problem is not the gas cap. This happened to me and after changing gas caps, I finally had the dealer run a code and it was the evaporative part in the emissions that was the problem. I think 75% of the time, this is what this means when "tighten gas cap" shows up in the DIC. Just wanted to offer this up.
 

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Cadillac Escalade 2008 and Cadillac SRX 2011
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24 Posts
@ Waychoff, what did they do and what was the approximate cost of the repair? Thanks in advance

DB
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,441 Posts
Trace out the EVAP system - from the throttlebody purge solenoid back to the charcoal canister, solenoids, and tank vent fitting. ANY air/vacuum leak in that purge system shows as a "loose cap", among other faults/codes. Also, on some of these EVAP systems there's a test port in the engine compartment, covered by a green (tire valve) cap, on the vacuum line from the throttlebody.
 

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2014 XTS-Vsport
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335 Posts
Same thing happened on my 07 Escalade around 100K
I replaced both the evaporative canister purge solenoid and the vapor canister purge valve. It was probably only one that was the problem but for the cost and time I did both. Parts cost under $100, took me 2 hours total.

Canister purge valve is on evaporative tank above spare tire, purge valve was on the intake manifold.
 
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