9ASCAP and P0457
9ASCAP and P0457
Soooo... I have the 9ASCAP message and the P0457 code. The 0457 code is a loose gas cap code. I've bought a new cap and also I've tried the OEM one that I took off shortly after buying the truck to fix this damn thing. I've cleared the code and briefly checked the filler tube for cracks and yet it comes back. Any advice on a common location in the evap system that fails that I'm missing? Yes I posted this on FB too 
and I need to look at the canister connections, but I am looking for any other advice. Could it be a connection at the purge solenoid or the NVLD Pump? Tell me your opinions! 
and I need to look at the canister connections, but I am looking for any other advice. Could it be a connection at the purge solenoid or the NVLD Pump? Tell me your opinions!
Professional
Joined: Feb 2011
Posts: 198
Likes: 0
From: Texas
Soooo... I have the 9ASCAP message and the P0457 code. The 0457 code is a loose gas cap code. I've bought a new cap and also I've tried the OEM one that I took off shortly after buying the truck to fix this damn thing. I've cleared the code and briefly checked the filler tube for cracks and yet it comes back. Any advice on a common location in the evap system that fails that I'm missing? Yes I posted this on FB too and I need to look at the canister connections, but I am looking for any other advice. Could it be a connection at the purge solenoid or the NVLD Pump? Tell me your opinions!
and I need to look at the canister connections, but I am looking for any other advice. Could it be a connection at the purge solenoid or the NVLD Pump? Tell me your opinions!
So I looked over everything and could not find any cracks or wanna be holes, etc I am not sure why I didnt originally do this, but I unhooked the battery for a bit and such to reset the computer. Well, I hooked it all back up, and started her up and the message is gone. I have had 3 additional key starts and everything is clear still. I am going to chalk this up to a faulty gas cap like the truck was telling me. The new locking gas cap is working well and is of better quality than the one I had... I'll stick with SLANT over CST
I am not sure why I didnt originally do this, but I unhooked the battery for a bit and such to reset the computer. Well, I hooked it all back up, and started her up and the message is gone. I have had 3 additional key starts and everything is clear still. I am going to chalk this up to a faulty gas cap like the truck was telling me. The new locking gas cap is working well and is of better quality than the one I had... I'll stick with SLANT over CST
So, an update... a few days after I posted above, the CEL popped back on with a new code P0440 - General Evap System Error... I fought with it for a week trying to track it down, I checked all the hoses and such and didnt find the issue. I thought it was either a pinhole leak or one of the components. Well I took it to the dealer and the NVLD Pump was/is bad. $240 later for the diagnostic, pump, and labor and the truck will be done today. Its an easy fix to do. Its right on top of the tank near the left rear tire. The pumps are are not to expensive either; however I dont have to time to do it and this will guarantee its the issue. I felt that was fair and it gives me peace of mind knowing if it isnt the issue then I can be all WTF? with them; however, of all the dealerships, these guys have always been top notch and honest with everything. Figured I would let anyone with a similar issue know my results.
Professional
Joined: Mar 2010
Posts: 166
Likes: 0
So, an update... a few days after I posted above, the CEL popped back on with a new code P0440 - General Evap System Error... I fought with it for a week trying to track it down, I checked all the hoses and such and didnt find the issue. I thought it was either a pinhole leak or one of the components. Well I took it to the dealer and the NVLD Pump was/is bad. $240 later for the diagnostic, pump, and labor and the truck will be done today. Its an easy fix to do. Its right on top of the tank near the left rear tire. The pumps are are not to expensive either; however I dont have to time to do it and this will guarantee its the issue. I felt that was fair and it gives me peace of mind knowing if it isnt the issue then I can be all WTF? with them; however, of all the dealerships, these guys have always been top notch and honest with everything. Figured I would let anyone with a similar issue know my results.
P0457
P0456
P0440