Quote:
Originally Posted by Aboonah
jCat - are you sure about the PO455? Everything I've seen says it comes up as "EVAP large leak detected" and the 1st listed cause is loose fuel cap.
When I picked up the suburban they gave me a gas receipt for $10 of gas that one of their guys put in it to test the flow. When I went to fill it and test it myself, I found the cap loose! I assumed that was what threw the PO455 code, because it fit the description.
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HERE IS A gm TSB
this is a bulletin i found for you ,,,,enjoy !
#02-06-04-037J: Check Engine Light On, Fuel
Tank Hard to Fill, DTCs P0442, P0446, P0455 or P0449 Set (Replace Evaporative
Emission (EVAP) Vent Valve Sloenoid Assembly and Add/Relocate Filter Box Using
Service Kit) - (Mar 20, 2012)
Subject:
Check Engine Light On, Fuel Tank Hard to Fill,
DTCs P0442, P0446, P0455 or P0449 Set (Replace Evaporative Emission (EVAP) Vent
Valve Solenoid Assembly and Add/Relocate Filter Box Using Service Kit)
Models:
1999-2007 Chevrolet Silverado (Classic) Models
1999-2007 GMC Sierra (Classic) Models
2007-2010 Chevrolet Silverado Models (Including
Hybrid)
2007-2010 GMC Sierra Models (Including
Hybrid)
This bulletin is being revised to update the Parts Information.
Please discard Corporate Bulletin Number 02-06-04-037I (Section 06 –
Engine/Propulsion System).
Condition
Some customers may comment about the check engine light being illuminated.
They may also comment that their vehicle is difficult to fill with fuel or when
filling, the pump continuously shuts off before the tank is full.
When checking the vehicle for DTCs, the ECM may report one or more of the
following DTCs set as current or in history: P0442, P0446, P0449 or P0455.
Cause
The EVAP canister vent solenoid (CVS) valve draws fresh air into the system
through a vent.
Under certain operating conditions, dirt and dust intrusion into the EVAP CVS
fresh air intake/venting system, may result in restricted air flow.
Under certain operating conditions, water, if ingested into the EVAP CVS
fresh air intake/venting system, may reach the CVS valve causing corrosion in
the CVS valve, and may cause restrictions in the fresh air intake path, when the
valve is in the closed position.
Correction (1999-2007 Classic/Old Style
Models)
After following the published SI diagnostics and determining that the EVAP
canister vent valve is the cause of the MIL light, replace the existing EVAP
canister vent valve assembly with a new assembly. This new assembly is a sealed
unit that is designed to be vented through a remote filter box. To ensure
correct installation, follow the procedures below.
Important: DO NOT replace the EVAP canister assembly for this concern
unless it fails the leak test.
1999-2003 Model Year (Use Service
Kit P/N 19207762)
Important: The new canister vent valve will be installed in a new
location, outside of the frame.
- Raise the vehicle. Suitably support the vehicle.
- Disconnect the EVAP canister vent valve electrical
connector, if equipped.
- Disengage the two vent valve pipe clips securing the pipe to
the underbody. Remove the clips from the underbody and discard.
- Disconnect the vent valve pipe at the EVAP canister.
- Remove and retain the EVAP canister vent valve bracket
mounting bolt.
- Remove the complete EVAP canister vent valve assembly with
bracket attached and discard.
- Position and secure the new valve assembly to the frame
bracket on the outside of the frame using the existing hole and mounting
bolt.
Tighten
Tighten the bracket mounting bolt to 12 Y (106 lb in).
- Connect the vent valve pipe to the EVAP canister.
- Install the two vent valve pipe clips into the existing
underbody holes.
- Connect the EVAP canister vent valve electrical connector, if equipped.
- Attach bulk 5/8” heater hose to the vent valve port and secure using a
clamp. Run a length as needed along the frame rail routing to the area above the
transmission.
- Cut the hose to determined length and install the supplied filter box.
Secure using a clamp.
- Remove the transmission support and lower the transmission assembly as
necessary to allow for access to the new filter box location.
- Secure the filter box to the transmission vent hose just forward of the hose
tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
hose. The filter box opening should be pointing downward.
- Raise the transmission and reinstall the transmission support.
- Tie strap the hose as needed along the frame rail in order to keep the hose
away from pinch-points and heat sources.
- Lower the vehicle.
2004-2007 Model Year (Use Service Kit
P/N 19207763)
Crew Cab Short Box Shown Below, Other
Configurations Similar
Extended Cab Short Box Shown Below,
Other Configurations Similar
- Raise the vehicle. Suitably support the vehicle.
- Disconnect the EVAP canister vent valve electrical
connector.
- Disconnect the canister pipe from the vent valve.
- Push in the retainer and remove the existing canister vent
valve from the fuel tank clip or mounting bracket. Discard the old valve.
- Cut back the existing canister pipe approximately 51 mm
(2 in) to remove the quick connect end.
- Install the new canister vent valve solenoid to the fuel
tank clip or mounting bracket as shown above. The valve port closest to the
electrical connector must point towards the canister.
- Cut bulk 5/8” heater hose to a length of approximately 76 mm
(3 in). Install the hose between the solenoid and the canister pipe and secure
using clamps.
- Attach bulk 5/8” heater hose to the vent port and secure
using a clamp. Run a length as needed along the frame rail routing to the area
above the transmission.
- Cut the hose to determined length and install the supplied
filter box. Secure using a clamp.
- Remove the transmission support and lower the transmission assembly as
necessary to allow for access to the new filter box location.
- Secure the filter box to the transmission vent hose just forward of the hose
tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
hose. The filter box opening should be pointing downward.
- Raise the transmission and reinstall the transmission support.
- Connect the EVAP canister vent valve electrical connector.
- Tie strap the hose as needed along the frame rail in order to keep the hose
away from pinch-points and heat sources.
- Lower the vehicle.
Correction (2007-2010 New Style
Models)
After following the published SI diagnostics and determining that the EVAP
canister vent valve is the cause of the MIL light, replace the EVAP canister
vent valve assembly and relocate the remote filter box. To ensure correct
installation, follow the procedures below.
Important: DO NOT replace the EVAP canister assembly for this concern
unless it fails the leak test.
Use Service Kit P/N 19207763
2500 Crew Cab Short Box Shown Below,
Other Configurations Similar
1500 Extended Cab Short Box Shown
Below, Other Configurations Similar
- Raise the vehicle. Suitably support the vehicle.
- Disconnect the EVAP canister vent valve electrical
connector.
- Disconnect the vent valve pipe quick connect from the
canister.
- Either cut the existing valve vent pipe and leave the
remaining section of pipe in the vehicle or remove along with the valve.
- Push in the retainer and remove the existing canister vent
valve from the fuel tank clip or mounting bracket.
- Cut back the existing canister pipe approximately 51 mm
(2 in) and retain the pipe for use with new valve.
- Connect the canister pipe quick connect to the
canister.
- Install the new canister vent valve solenoid to the fuel
tank clip or mounting bracket as shown above. The valve port closest to the
electrical connector must point towards the canister.
- Cut bulk 5/8” heater hose to a length of approximately 76 mm
(3 in). Install the hose between the solenoid and the canister pipe and secure
using clamps.
- Attach bulk 5/8” heater hose to the vent port and secure using a clamp. Run
a length as needed along the frame rail routing to the passenger side area above
the transmission.
- Cut the hose to determined length and install the supplied filter box.
Secure using a clamp.
- Remove the transmission heat shield, if necessary.
- Remove the transmission support and lower the transmission assembly as
necessary to allow for access to the new filter box location.
- Secure the filter box to the transmission vent hose just forward of the hose
tee-section using a tie strap. DO NOT pinch or restrict the transmission vent
hose. The filter box opening should be pointing downward.
- Raise the transmission and reinstall the transmission support.
- Reinstall the transmission heat shield.
- Connect the EVAP canister vent valve electrical connector.
- Tie strap the hose as needed along the frame rail in order to keep the hose
away from pinch-points and heat sources.
- Lower the vehicle.
Parts Information
Part Number
Description
Qty
19207762 (1999-2003 Model Year)
Solenoid Kit, EVAP Emission Canister Vent Valve
1
19207763 (2004-2010 Model Year)
Solenoid Kit, EVAP Emission Canister Vent Valve
1
9438383 (5/8” X 25' roll)
Hose
Cut to Length
12337820
Tie-Strap
5
11609970
Clamp
2 (1999-2003)
or
4 (2004-2008)
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
J7908*
Replace Evaporative Emission (EVAP) Vent Valve Solenoid Assembly and
Add/Relocate Filter Box Using Service Kit
1.1 hrs**
* This is a unique labor operation for bulletin use only. It will not be
published in the Labor Time Guide.
**Diagnosis time is included in this labor time.