High Altitude Stall During Hot Ambient Temperatures - keywords fuel hard pump start
| Subject: | High Altitude Stall During Hot Ambient Temperatures |
| Models: | 2005 Cadillac Escalade |
| 2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2005 GMC Sierra, Yukon |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Intermittent stall, low power, and hard restart when the vehicle is used during high ambient temperatures and in high altitudes. After the engine cools down, the vehicle may restart and run fine. During diagnosis, lean codes P0171/P0174 may be found.
Recommendation/Instructions:
Complete current SI diagnostics for any trouble codes or symptoms found.
If the customer concern of stalling can be duplicated, monitor the fuel pump pressure. If the fuel pressure is low during the concern, the fuel pump will need to be replaced. There are updated fuel pump modules available for this concern.
Application | Fuel Pump Module Part Number |
|---|---|
C/K 1500/2500 GMT800 Pickups Short box (6.5 foot bed 26 gallon tank | 19133450 |
C/K 1500/2500/3500 GMT800 Pickups Long Box 34 gallon tank | 19133456 |
C/K 1500/2500 GMT800 Pickups Crew Cab (15543) Short/Short box (5.5 foot bed) | 19133481 |
Suburban / Yukon XL 2500 LQ4 or L18 | 19133475 |
C/K 3500 Cab Chassis LQ4 or L18 | 19133475 |
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.
