SES MIL Evap DTC - keywords emission engine evap evaporative fuel large leak P0446 P0442 P0455 pressure solenoid tank vacuum vent
| Subject: | SES MIL Evap DTC |
| Models: | 2007-2008 Cadillac Escalade, ESV, EXT |
| 2007-2008 Chevrolet Avalanche, Suburban, Tahoe |
| 2007-2008 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL |
This PI was superseded to update model years. Please discard PIT4347.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment on a SES MIL and when checking for DTCs the ECM will have set an Evap DTC. While performing normal diagnostics it may be noticed there is excessive moisture/water/corrosion at the vent valve solenoid, vent valve pipes, and/or EVAP canister. The vent valve solenoid draws fresh air from near the top of the fuel filler pipe. In some situations, it is possible that water, being sprayed off the rear wheels, may be drawing in though the vent valve pipe at the top of the fuel filler pipe.
Recommendation/Instructions:
GM engineering is aware of this concern and working on a permanent correction. At this time clean and/or replace the affected components to correct the concern.
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.
