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There are a couple of high failure areas ,here is info.
09-06-04-028B: MIL Illuminated, DTCs P0442, P0446, P0455 or P0449 Set Fuel Tank Hard to Fill, Corrosion/Water at EVAP CVS Valve ( Install CVS Valve/Filter) - (Oct 6, 2010)
|Subject:||Malfunction Indicator Lamp (MIL) Illuminated, DTCs P0442, P0446, P0455 or P0449 Set - Fuel Tank Hard to Fill - Moisture, Water, Corrosion at Evaporative Emissions (EVAP) Canister Vent Solenoid (CVS) Valve (Replace Conduit, Install New CVS Valve and Revised Filter) |
|Models:||2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT |
|2007-2009 Chevrolet Avalanche, Suburban (1500 Series), Tahoe |
|2007-2009 GMC Yukon, Yukon XL (1500 Series), Yukon Denali, Yukon XL Denali |
This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 09-06-04-028A (Section 06 - Engine/Propulsion System).
| • ||Some customers may comment that the fuel tank is hard to fill.|
| • ||Some customers may also comment that the malfunction indicator lamp (MIL) is illuminated. |
| • ||The technician may find DTCs P0442, P0446, P0455 or P0449 set as current or in history. |
| • ||The technician may observe evidence of water intrusion at the evaporative emissions (EVAP) canister vent solenoid (CVS) valve. |
This condition may be caused by water spray that is generated by the rear wheels. The EVAP CVS valve draws fresh air into the EVAP system around a mushroom cap covered opening in the conduit that is mounted near the top of the fuel filler pipe. Under certain operating conditions, the moisture is ingested into the fresh air intake conduit opening, and is carried down though the conduit to the EVAP CVS valve causing corrosion in the CVS valve, and restrictions in the fresh air intake path, when the valve is in the closed position.
The water also collects in the CVS valve cyclonic filter in order to protect the EVAP canister. However if the capacity of the cyclonic filter is exceeded, this may result in water entering the EVAP canister and cause an additional restriction during refueling.
Note: If the revised filter is already installed on the vehicle, refer to the appropriate DTC procedures in SI.
- Turn OFF the ignition, and all electrical components, including the scan tool if connected.
- Remove the fuel fill cap.
- Remove the fuel tank filler housing to body TORX® screws (1) and retainer (2).
- Raise and support the vehicle at the appropriate height, in order to gain access to the spare tire assembly. Refer to Lifting and Jacking the Vehicle in SI.
- Remove the spare tire and wheel assembly.
- Disconnect the chassis wiring harness electrical connector (1) from the CVS valve.
Important: Clean the EVAP line connections and surrounding areas prior to disconnecting, in order to avoid possible EVAP system contamination.
- Disconnect the CVS valve quick connect fitting (1) from the EVAP canister, and disconnect the fuel filler pipe EVAP line quick connect fitting (3) from the CVS valve. Refer to Plastic Collar Quick Connect Fitting Service in SI.
- Disengage the retainer (1) securing the CVS valve to the bracket, and remove the CVS valve.
- Remove the zip ties (1) as needed, and the CVS valve black conduit and mushroom cap (2).
- Leave attached a 50 mm (2 in) piece of the CVS valve black conduit to the plastic collar quick connect fitting that was disconnected from the CVS valve.
- Securely connect a 1.22 m (48 in) length of 19 mm (0.75 in) inside diameter heater hose to the 50 mm (2 in) piece of black conduit that is connected to the plastic collar quick connect fitting for the CVS valve.
- Install and fully seat the revised CVS valve filter into the open end of the 1.22 m (48 in) heater hose that is attached to the 50 mm (2 in) piece of black conduit.
- Lower the fuel tank filler pipe housing (3), and the fuel tank fill hose (4).
- Add two holes to the fuel tank filler pipe housing, approximately 25 mm (1 in) apart as indicated in the illustration, in order to secure the heater hose, and CVS valve filter with a zip tie to the housing.
Note: Observe the proper orientation of the CVS valve filter (1) in the illustration.
- Secure the CVS valve filter (1) and the CVS valve heater hose to the fuel tank filler pipe housing with a zip tie as indicated in the illustration. Position the zip tie so that sharp surfaces are not present within the fuel cap area of the housing.
- Raise the fuel tank filler pipe housing, and the fuel tank fill hose back to the original position, and install the zip ties that were removed from their previous locations. Verify that kinks do not exist at any point in the heater hose.
- Install the CVS valve and connect the electrical connector. Connect the CVS valve quick connect fitting (1) to the EVAP canister, and connect the fuel filler pipe EVAP line quick connect fitting (3) to the CVS valve. Refer to Plastic Collar Quick Connect Fitting Service in SI.
- Install the spare tire and wheel assembly.
- Lower the vehicle.
- Install the fuel tank filler housing to body TORX® screws (1) and retainer (2).
Tighten the screws to 2.3 N·m (20 lb in).
- Install the fuel fill cap.
- With a scan tool clear any DTCs that may be present.
Valve, EVAP EMIS CNSTR CONT
Valve, EVAP EMIS CNSTR CONT
Filter, EVAP EMIS CNSTR VENT VLV
12368236 or Equivalent
Heater Hose 7.62 m (25 ft) Length, 19 mm (0.75 in) ID Roll
USD $24.49 (per 1.22 m (48 in) Length)
CAD $45.01 (per 1.22 m (48 in) Length
PIP3809C: SES Light - Inspect wire Harness For Short On Front Drive Shaft - (Feb 12, 2009)
|Subject:||SES Light - Inspect Wire Harness for Short on Front Drive Shaft|
|Models:||2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe|
|2007-2009 Cadillac Escalade|
|2007-2009 GMC Sierra, Yukon|
|Most Recent Body Style withXXXXXand V8 Engine|
This PI was superseded to update model years and DTCs. Please discard PIP3809B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Some customers may complain of an intermittent crank no start, no crank, SES light, and/or security light. Upon inspection, the technician may find low fuel pressure and/or any of the following DTCs: P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P069E, P0102, P0113, P0118, P0131, P0132, P0135, P0137, P0140, P0141, P0161, P0230, P0335, P0341, P0151, P0152, P0155, P0157, P0158, P0161, P0171, P0172, P0174, P0175, P0449, P0452, P0532, P0641, P069E, P1133, P1153, P1682, P2101, P2534, and/or P2544.
If the SI diagnostics do not isolate a cause for this concern, inspect the wiring harness above the front drive shaft for a potential short to ground, near the transfer case side of the front drive shaft as shown below. Repair any chaffed wires by following SI repair procedures.
The harness should be secured to a supporting bracket with a plastic clinch style clip. If the harness has contacted the front drive shaft because of a missing retaining clip, secure the harness to the metal fuel line bracket with a tie strap to prevent a reoccurrence. If the retaining clip is present but contact still occurred, relocate the inboard clip (part of the wiring harness) and tie strap the harness to prevent a reoccurrence.
Here is an example of a harness that is too close:
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.