WenmarOpen by Wenmar Pro

Service bulletin 12138

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10089661
Published by NHTSA2017-01-26
Manufacturer's number12138
Manufacturer's date2012-10-25
NHTSA componentENGINE; EQUIPMENT

NHTSA's summary

12138 - CUSTOMER SATISFACTION PROGRAM. NORMAL ENGINE VIBRATION WHILE IN ACTIVE FUEL MANAGEMENT (AFM) MODE MAY CAUSE THE TRANSMISSION DIPSTICK TUBE TO FATIGUE AND FRACTURE. IF THIS OCCURS, IT COULD CAUSE A TICK OR RATTLE NOISE FROM THE FRONT OF THE VEHICLE. DEALERS ARE TO INSPECT THE TRANSMISSION DIPSTICK TUBE FOR A FRACTURE AND REPLACE IT IF NECESSARY. IF NO FRACTURE IS FOUND, DEALERS ARE TO INSTALL A FOAM SLEEVE AROUND THE TUBE TO ABSORB THE VIBRATION.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Equipment and accessories

Vehicles listed
CADILLAC ESCALADE2010, 2011
CADILLAC ESCALADE ESV2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE EXT2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET AVALANCHE2010, 2011
CHEVROLET SILVERADO 15002010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN2010, 2011
CHEVROLET TAHOE2010, 2011
GMC SIERRA 15002010, 2011 (the catalog's model; the bulletin names a series or trim of it)
GMC YUKON2010, 2011
GMC YUKON XL2010, 2011

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
18V2670002018-04-26. EQUIPMENT
16V8680002016-12-02. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
00-06-01-026R2025-12-03. Service bulletin. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
23-NA-1532025-10-25. Service bulletin. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
22-NA-0742025-02-12. Service bulletin. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
03-06-01-023I2025-01-17. Service bulletin. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
21-NA-0432024-12-10. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
04-06-01-029K2024-12-04. Service bulletin. This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
03-06-01-023H2024-11-14. Service bulletin. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
01-06-01-011Q2024-11-13. Service bulletin. This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
20-NA-1382024-11-05. Service bulletin. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.