EI08245 - SES Light, DTC P0300, Engine Lifter Tick Noise, Misfire on Cylinders 1, 4, 6 or 7 (Engineering Information)
| Subject: | EI08245 -- SES Light, DTC P0300, Engine Lifter Tick Noise, Misfire on Cylinders 1, 4, 6 or 7 (Engineering Information) |
| Models: | 2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2008 GMC Sierra, Yukon |
| with Active Fuel Management (AFM) (RPO L76 and LC9) |
| Attention: | For dealers in U.S. and Canada Only, proceed with this bulletin ONLY if the customer has commented about this concern AND the EI number is listed in GMVIS. If the customer has not commented about this condition or the EI does not show in GMVIS, disregard the bulletin and proceed with diagnostics found in published Service Information (SI). THIS IS NOT A RECALL- refer to Service Bulletin # 04-00-89-053B for more detail on the use of Engineering Information bulletins. |
This bulletin is being revised to update the parts information table. Please discard Corporate Bulletin Number 08-06-01-018 (Section 06 -- Engine/Propulsion System).
Condition
Some customers may comment on an engine lifter tick noise, engine misfire and SES light.
Upon investigation, the technician may find DTC P0300, misfires on cylinder 1, 4, 6 or 7 (deactivation cylinders) and a collapsed AFM lifter.
Important: Only vehicles diagnosed with a collapsed AFM lifter are to use this bulletin for repairs.
Cause
GM Engineering is attempting to determine the root cause of this condition. GM Engineering has a need to obtain information first hand during diagnosis and repair. As a result, this information will be used by engineering to "root cause" the customer's concern and develop/validate a field fix.
Instructions
Important: If this concern is experienced and the SI diagnostics isolates a collapsed Active Fuel Management (AFM) lifter, perform the steps below:
When you are done with the repairs, contact Ann Briedis at 586-575-4439 or Ashmi Haria at 586-492-5418 with the information below. Parts will be requested back using the WPC return process. Do not ship parts until a request has been received from the WPC.
- Verify that the VIN and mileage are correct on the repair order.
- Is the SES light on? If yes, list all stored DTCs before clearing the DTCs with the Tech 2®.
- List all other repairs that have been performed to the vehicle during this service visit.
- List the remaining oil life monitor percentage (%).
- What is the engine oil level?
- What is the best description of the oil quality/appearance?
- Provide your dealership's fax number.
| • | Overfull |
| • | Full |
| • | Up to 1 Quart Low |
| • | Greater than 1 quart low |
| • | Normal |
| • | Excessively Dirty/Sludge |
| • | Excessively Fuel Dilution/Odor |
Repairs
Important: DO NOT disconnect the VLOM electrical connector.
Replace the Valve Lifter Oil Manifold (VLOM) Assembly, ALL of the Active Fuel Management (AFM) lifters, and the VLOM electrical connector per the procedure outlined in Service Information (SI).
It is important to leave the VLOM connector attached/connected to the VLOM assembly when performing these repairs. Cut the VLOM circuit near the VLOM connector, leaving enough wire exposed (approximately 4 inches) so the new VLOM electrical connector pigtail can be installed with the duraseal splice sleeves that are supplied with the new pigtail.
When using these splice sleeves, it is important to use the correct crimp tools called out in the "Splicing Copper Wire Using Splice Sleeves" procedure in SI, rather than a generic set of crimp tools.
Contact Ann Briedis 586-575-4439 or Ashmi Haria at 586-492-5418 after all repairs are complete with the information above.
Parts Information
Part Number | Description | Qty |
|---|---|---|
12571595 | Lifter, Valve (AFM Lifter) | 8 |
12580901 | Manifold, Valve Lifter Oil Assembly | 1 |
15306027 | Connector, Valve Lifter Oil Manifold | 1 |
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J7533* | Engine Lifter Tick Noise - Engineering Information | 10.6 hrs |
*This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide. | ||
