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Warning lights: VSC OFF, VSC TRAC, Anti Skid, CEL - P0456
#1
Intermediate
Thread Starter
Warning lights: VSC OFF, VSC TRAC, Anti Skid, CEL - P0456
My 09 GX with 99k miles just had all these lights come on so I checked for the codes using the OBD tool. It came up with P0456.
Based on searching this forum it seems to be relate to evaporator leak and for most people just changing the gas cap fixed their issue. The search did not show any results for GX, but I assume it must be same for all models of Lexus.
Please let me know if you have any advice regarding this.
Also, I've noticed over last couple of months that the MPG has dropped from 18.5 to 13.5. Could this be related to the issue I'm having? Would you recommend that I just replace the gas cap or take it to the dealer to get it completely checked out?
Based on searching this forum it seems to be relate to evaporator leak and for most people just changing the gas cap fixed their issue. The search did not show any results for GX, but I assume it must be same for all models of Lexus.
Please let me know if you have any advice regarding this.
Also, I've noticed over last couple of months that the MPG has dropped from 18.5 to 13.5. Could this be related to the issue I'm having? Would you recommend that I just replace the gas cap or take it to the dealer to get it completely checked out?
#2
Lexus Champion
Try the gas cap first. If that doesnt work take it to the dealer.
* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking
A 5mpg drop off is huge. Welcome to my world! I get worse that 13.5mpg around town. If 13.5mpg is your combined mpg (city and highway) something is definitely wrong!
* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking
A 5mpg drop off is huge. Welcome to my world! I get worse that 13.5mpg around town. If 13.5mpg is your combined mpg (city and highway) something is definitely wrong!
#3
Intermediate
Thread Starter
Try the gas cap first. If that doesnt work take it to the dealer.
* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking
A 5mpg drop off is huge. Welcome to my world! I get worse that 13.5mpg around town. If 13.5mpg is your combined mpg (city and highway) something is definitely wrong!
* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking
A 5mpg drop off is huge. Welcome to my world! I get worse that 13.5mpg around town. If 13.5mpg is your combined mpg (city and highway) something is definitely wrong!
I was hoping that the code would reveal the poor MPG issue. Otherwise there are endless possibilities for the cause of this. Do you think the evap leak may be contributing to this?
I'm going to start with gas cap, then check the tire pressure and air filter to rule the small stuff out. I've already added Techron fuel injector cleaner but that didn't help much.
#4
Intermediate
Thread Starter
I replaced the gas cap and drove it several miles, but all warning lights are still on.
The code P0456 still comes up. Would you suggest resetting the code and see if it comes up again? Or should I take it to a mechanic to get it checked out. I'd rather fix an issue if there is one for peace of mind and not to harm anything further.
Please let me know what the possible causes may be. I'd like to have some knowledge prior to making a visit to the mechanic. I've searched the forum and for most people the gas cap replacement seemed to fix their issue, but unfortunately not for me.
Thanks.
The code P0456 still comes up. Would you suggest resetting the code and see if it comes up again? Or should I take it to a mechanic to get it checked out. I'd rather fix an issue if there is one for peace of mind and not to harm anything further.
Please let me know what the possible causes may be. I'd like to have some knowledge prior to making a visit to the mechanic. I've searched the forum and for most people the gas cap replacement seemed to fix their issue, but unfortunately not for me.
Thanks.
#5
Lexus Champion
A evap leak wont hurt your engine so Id reset it and see if it comes back. If the code comes back leave it on (dont reset it) and take it to your mechanic and have them pull the codes.
#6
Intermediate
Thread Starter
OK, will do. Hopefully with resetting the code the "limp mode" will go away too? I don't know exactly what that is, but driving at high speed in limp mode does not sound too safe.
#7
Lexus Champion
If your GX is in limp mode you wont be able to drive at high speeds because the RPM is limited. If I were youd Id leave the code and just take it by Lexus or Toyota.
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#8
Intermediate
Thread Starter
Update: I never got to resetting the code, and it eventually went away on its own + all the dash lights are now off.
I'm about half way through the gas tank and the MPG seems to be getting better so far.
Can't believe a gas cap can impact so many things.
I'm about half way through the gas tank and the MPG seems to be getting better so far.
Can't believe a gas cap can impact so many things.
#10
Intermediate
Thread Starter
#11
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Join Date: Dec 2012
Location: SC
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Gas Cap
I got one today from an Auto Parts Store, it did not have the wire from the cap
to the little door.
I only drove home, so I don't know yet if it solved the light problem.
I was told Toyota could not make an extra key, so I went to a Lexus Dealer $235.00
What things can a Toyota Dealer do for me on my GX?
The Lexus Dealer is 1.5 hours away.
#12
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Lights still on
I got one today from an Auto Parts Store, it did not have the wire from the cap
to the little door.
I only drove home, so I don't know yet if it solved the light problem.
I was told Toyota could not make an extra key, so I went to a Lexus Dealer $235.00
What things can a Toyota Dealer do for me on my GX?
The Lexus Dealer is 1.5 hours away.
to the little door.
I only drove home, so I don't know yet if it solved the light problem.
I was told Toyota could not make an extra key, so I went to a Lexus Dealer $235.00
What things can a Toyota Dealer do for me on my GX?
The Lexus Dealer is 1.5 hours away.
gas cap from the Toyota Dealer since the new one from the auto store did not
solve the problem?
#13
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Cheers,
Kermee
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