"Gas Cap Loose Check Cap" - 2001 Buick Lesabre
#1
Senior Member
Posts like a Turbo
Thread Starter
"Gas Cap Loose Check Cap" - 2001 Buick Lesabre
Hello Everyone ...
Yesterday the message "Gas Cap Loose Check Cap" showed .
The ESL - Engine Service Light in OFF .
I tried to close again the cap but it still show
What could be the problem ?
If I solve the problem The message will turn off automaticly or I need to RESET ?
Thanks !
Yesterday the message "Gas Cap Loose Check Cap" showed .
The ESL - Engine Service Light in OFF .
I tried to close again the cap but it still show
What could be the problem ?
If I solve the problem The message will turn off automaticly or I need to RESET ?
Thanks !
#2
Senior Member
I would assume once the car detects correct pressurization, it should turn off.
Most of the time the rubber sealing washer on the cap is the culprit.
I would recommend a new GM gas cap & stay away from after market ones.
You could disconnect both battery cables for a few minutes, that should clear that light/code.
Most of the time the rubber sealing washer on the cap is the culprit.
I would recommend a new GM gas cap & stay away from after market ones.
You could disconnect both battery cables for a few minutes, that should clear that light/code.
__________________
1997 Buick Pk Ave (Soft Ride) Suspension!
1997 Buick Pk Ave (Soft Ride) Suspension!
#3
Senior Member
Posts like a Camaro
I had this error a year or so ago, and replacing the gas cap did not solve the problem (although that'* probably the first thing you should try). I ended up finding a broken vacuum hose in the engine compartment. Here'* my thread:
https://www.gmforum.com/buick-172/ga...-spout-306988/
I think the car displays the "gas cap" error anytime a vacuum leak in the fuel system is detected, even though a leaky cap may not always be the cause.
https://www.gmforum.com/buick-172/ga...-spout-306988/
I think the car displays the "gas cap" error anytime a vacuum leak in the fuel system is detected, even though a leaky cap may not always be the cause.
#5
Senior Member
The loose gas cap code, usually means a very small leak...if the cap was loose,and you tighten it, the light will not go off right away, until the diagnostic has run two consecutive times and has passed both times....
Sometimes, even putting a new cap does not work, due to rust/corrosion on the fill pipe where the seal of the cap mates......If I notice any corrosion, I use crocus cloth to clean the fill pipe before putting on the cap.....
You can go to any auto parts store and they can clear the code right away, to know for sure....
If clearing the code and a new cap does not take care of the problem, unless you see something "visual", like a broken vac line, you are just guessing....a smoke test will easily find the leak....
On "H" cars the usual culprits are the purge solenoid(bad solenoid, wiring to it eaten by rodents, bad vac lines to and from it), the vent solenoid(does not seal), or the gas cap.....
Sometimes, even putting a new cap does not work, due to rust/corrosion on the fill pipe where the seal of the cap mates......If I notice any corrosion, I use crocus cloth to clean the fill pipe before putting on the cap.....
You can go to any auto parts store and they can clear the code right away, to know for sure....
If clearing the code and a new cap does not take care of the problem, unless you see something "visual", like a broken vac line, you are just guessing....a smoke test will easily find the leak....
On "H" cars the usual culprits are the purge solenoid(bad solenoid, wiring to it eaten by rodents, bad vac lines to and from it), the vent solenoid(does not seal), or the gas cap.....
The following users liked this post:
Soft Ride (04-06-2015)
#6
Senior Member
Posts like a Camaro
Check out the whole thread I linked... I ended up buying some rubber tubing and "making" my own replacement (for about $4), but the part # is in there for the new replacement part too (about $20). Or you can check into a junkyard replacement from a similar Buick model ($1 maybe) but then you run the risk of that one being just as old and prone to breakage.
#8
Senior Member
Posts like a Camaro
It probably depends on exactly which codes have been alerted, but mine went away almost immediately once the vacuum leak was plugged. Sometimes it takes a few engine restarts and/or some driving to eventually clear the code, or you can always use a code reader or disconnect the battery for a few minutes to manually clear it.
The following users liked this post:
Soft Ride (04-08-2015)
Thread
Thread Starter
Forum
Replies
Last Post