Possible Engine Oil Leak Due To PCV Freeze-Up - keywords 4.8 5.3 6.0 6.2 air ambient body cold dip dipstick fill freezing intake inlet L33 L59 L76 L92 LH6 LC9 LM7 LMF LMG LQ4 LQ9 LR4 LY2 LY5 LY6 start
| Subject: | Possible Engine Oil Leak Due to PCV Freeze-up |
| Models: | 2006-2008 Cadillac Escalade |
| 2002-2007 Chevrolet Avalanche, Express, Silverado, Tahoe Classic |
| 2002-2007 GMC Savana, Sierra, Yukon Classic |
| 2007-2008 Chevrolet Avalanche, Express, Silverado, Tahoe |
| 2007-2008 GMC Savana, Sierra, Yukon |
| Equipped with the 4.8 5.3 6.0 and 6.2 V-8 engines. |
This PI was superseded to update model years and part number. Please discard PIP3343.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A vehicle may be brought to the dealer with a customer concern of an oil leak after a cold start. This concern will only occur in areas with extremely low ambient temperatures.
During diagnosis the dealer may find the oil leak is coming from the dipstick tube. PCV freeze-up may induce an oil leak from the dipstick tube.
Recommendation/Instructions:
If an oil leak from the dip stick tube has been verified, and the PCV system has signs of freezing, replace the oil fill cap. There is an updated vented oil fill cap to repair this concern.
Order a new Vented Oil Fill Cap part number 12589430 from GMSPO.
Install the vented oil fill cap, clean and dry the PCV hoses, and evaluate the repair.
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.
