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Old 11-28-2016, 11:36 PM   #1
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P0455 Issues - Not Cap or Evap Solenoid

Hey all, having a rough time figuring this one out. The dash will say "Fuel Cap" and I'll get a P0455 code on my scan tool.
Truck is a 2005 Colorado Z71 4WD 5MT 2.8L Regular Cab.

The gas cap was replaced in April with one from GM directly, part number 10372246.
The Evap Canister Solenoid was replaced with an AC Delco part number 20907779 and the harness 19257603.

Not sure where to go from here, any troubleshooting tips and/or other common fixes? These were the only two things that stuck out to me after multiple searches.

Thanks!
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Old 11-29-2016, 07:26 AM   #2
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Re: P0455 Issues - Not Cap or Evap Solenoid



Maybe the Fuel Tank Pressure Sensor. It is mounted in the top of the fuel pump. On a Regular Cab it can be accessed through the wheel well.

https://smile.amazon.com/ACDelco-162...words=16238399

Could also be damaged plumbing for the EVAP system. Check the filler tube tank connection. Also the vent tube that connects to the filler tube. Both are also accessed through the wheel well.
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Old 11-29-2016, 08:14 AM   #3
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Re: P0455 Issues - Not Cap or Evap Solenoid

Thanks for the welcome!

The fuel tank pressure sensor would actually make sense, I don't have issues with backflow when filling the tank or anything like that.
For $14, it's definitely worth trying. I'll also check for a How-To on here for it so I'm prepared.

I'll double check the hoses/tubes for the evap system that are accessible both from underneath and through the wheel well. I assume it's just plastic body clips holding that in?
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Old 11-29-2016, 09:24 AM   #4
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Re: P0455 Issues - Not Cap or Evap Solenoid

Dropping this link (sorry, it's outside!!) for my reference later. It's the only thing I found on how to replace the fuel pressure sensor.
If time permits while I'm doing the job myself I'll do a How-To for 355

replace fuel pressure sensor (16238399) on chevrolet colorado - Chevy Colorado & GMC Canyon
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Old 11-29-2016, 09:18 PM   #5
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Re: P0455 Issues - Not Cap or Evap Solenoid

The fuel tank pressure sensor is just a push in installation. The problem you will most likely experience with replacing it is that it pulls out a lot harder than it pushes in. One guy recently broke off the stem try to remove one.

I think most of the EVAP tubes have quick disconnects. Not sure about the vent hose that goes from the filler tube to the tank.
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Old 11-29-2016, 11:33 PM   #6
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Quote:
Originally Posted by cart7881 View Post
The fuel tank pressure sensor is just a push in installation. The problem you will most likely experience with replacing it is that it pulls out a lot harder than it pushes in. One guy recently broke off the stem try to remove one.

I think most of the EVAP tubes have quick disconnects. Not sure about the vent hose that goes from the filler tube to the tank.
I'll keep that in mind, to take care, when removing the existing sensor. I'm really hoping that I find something that's obviously wrong and/or the sensor fixes it. Chasing this is getting frustrating.
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Old 12-08-2016, 08:13 AM   #7
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Re: P0455 Issues - Not Cap or Evap Solenoid

Quick update, got the fuel tank pressure sensor installed last night. Waiting for my codes to reset.

Replacing the old one was really only difficult because of where I had to snake my arm to get to it. It ripped the boot on the old sensor, but it came out. Installing the new one was a piece of cake.
Honestly, the hardest part of this job was getting the wheel well liner out.

Driving the WRX today and tomorrow though, nicer days to get it out are few and far between lately.
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Old 12-09-2016, 08:06 AM   #8
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Re: P0455 Issues - Not Cap or Evap Solenoid

Fuel tank pressure sensor didn't help, still getting the fuel cap message. No CEL yet, but I have only driven it ~12 miles.
When under the truck I could not find any hoses for the evap system that would have been problematic.
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Old 12-22-2016, 10:31 AM   #9
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Still getting the P0455 fault code... Anything else you guys can think of?
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Old 12-22-2016, 10:41 AM   #10
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Re: P0455 Issues - Not Cap or Evap Solenoid

I don't have first hand experience with your problem but if you haven't looked at this thread yet it may help. I know its not the same code but it could get you some better troubleshooting ideas.

My first CEL P0442 Leak at Rollover valve ( update 10/9/16 ). page 5

Have you smoke tested the evap system yet?
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Old 12-22-2016, 11:40 AM   #11
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Re: P0455 Issues - Not Cap or Evap Solenoid

OBD-II Trouble Code: P0455 Evaporative Emission Control System Leak Detected (no purge flow or large leak)

I my case it was a lack of flow rather than a leak. I had a canister that was leaking grains of charcoal and plugged the valves and lines. Ended up replacing the canister and the valves and using the compressor to blowout the lines.

Erased the code and all has been good . No more po455 but I will say it was a little bit of a bit h to figure out.
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Old 12-22-2016, 10:31 PM   #12
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Re: P0455 Issues - Not Cap or Evap Solenoid

If I get a good warm weekend I'll pull all the lines off and check to see if any are plugged up, have a compressor here so I can blow them down.

As time allows I'll get a read through the thread you linked, Jaymes, I hadn't seen it yet.

Edit; read through the thread, I'm going to replace the purge valve soon-ish and see where that gets me.
If it comes down to smoke testing, I'll likely take it to my uncle to do at his shop.
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Last edited by ATMINSIDE; 12-22-2016 at 10:57 PM.
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Old 02-09-2017, 06:36 PM   #13
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Re: P0455 Issues - Not Cap or Evap Solenoid

Finally ordered the vapor canister purge valve, ACDelco model 214-1680.
https://www.amazon.com/ACDelco-214-1.../dp/B000NWA6T0

Supposed to be nice this weekend, already going to be working on the truck. Hopefully it'll show up nice and early!
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Old 02-09-2017, 08:58 PM   #14
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Re: P0455 Issues - Not Cap or Evap Solenoid

Consider it could also be vacuum leaks at the roll over valve or fuel pump module.
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Old 02-10-2017, 09:40 AM   #15
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Re: P0455 Issues - Not Cap or Evap Solenoid

Quote:
Originally Posted by Gold Country Russ View Post
Consider it could also be vacuum leaks at the roll over valve or fuel pump module.
I'll keep that in mind. Still need to blow down lines to verify they're not blocked as well.
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Old 02-11-2017, 04:35 PM   #16
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Re: P0455 Issues - Not Cap or Evap Solenoid

Vapor canister purge valve installed, now we wait...
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Old 03-14-2017, 06:16 PM   #17
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Re: P0455 Issues - Not Cap or Evap Solenoid

Have driven a good bit, and filled up with gas, since the vapor canister purge valve was installed. All good so far!
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Old 03-20-2017, 03:15 PM   #18
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Re: P0455 Issues - Not Cap or Evap Solenoid

Passed inspection over the weekend with no codes. Hopefully this is my last update here
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