# Service bulletin GCUS\-3\-314

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.

- Type: Service bulletin
- NHTSA id: 10126409
- Published by NHTSA: 2017\-12\-22
- Manufacturer's number: GCUS\-3\-314
- Manufacturer's date: 2015\-10\-13
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

15638 \- Customer Satisfaction Program. Certain 2016 model year Cadillac Escalade, Escalade ESV, Chevrolet Corvette, GMC Yukon Denali and 2015 Cadillac Escalade ESV, Chevrolet Silverado LD, GMC Sierra LD, and Yukon Denali XL model vehicles equipped with 6.2L engines \(RPO L86 and LT1\) may have engines built with cylinder head gaskets in which the head gasket stopper ring was off location. The gasket may fatigue over time leading to the possibility of a leak into the combustion chamber after several thousand miles. Possible symptoms include: a check engine light for P0300 Misfire, possible combustion gas leaks to coolant resulting in overheating, over\-flowed coolant bottle, milky\-colored engine oil in the crankcase, piston scuffing and if the vehicle is continued to be driven in this condition, engine failure. Dealers are to replace the left and right side engine head gasket.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10126409-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10126409-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Trouble codes named

P0300

## Vehicles listed

- 2016 CADILLAC ESCALADE
- 2015 to 2016 CADILLAC ESCALADE ESV
- 2016 CHEVROLET CORVETTE
- 2015 CHEVROLET SILVERADO 1500
- 2015 CHEVROLET SILVERADO 2500
- 2015 CHEVROLET SILVERADO 3500
- 2015 GMC SIERRA 1500
- 2015 GMC SIERRA 2500
- 2015 GMC SIERRA 3500
- 2016 GMC YUKON DENALI
- 2015 GMC YUKON DENALI XL

## Recalls for the same vehicles and component

- [2014577](/recalls/tc/2014577.md), 2014-12-18: Engine
- [14V007000](/recalls/nhtsa/14V007000.md), 2014-01-13: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

## Other bulletins for the same vehicles and component

- [00\-06\-01\-026R](/bulletins/11026017.md), 2025-12-03, Service bulletin: ENGINE. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- [23\-NA\-153](/bulletins/11024485.md), 2025-10-25, Service bulletin: ENGINE. 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\-080](/bulletins/11024330.md), 2025-10-16, Service bulletin: ENGINE. This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
- [15\-NA\-010](/bulletins/11020254.md), 2025-07-07, Service bulletin: ENGINE. This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states.
- [25\-NA\-052](/bulletins/11017263.md), 2025-04-28, Service bulletin: ENGINE. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
- [25\-NA\-052](/bulletins/11016942.md), 2025-04-10, Service bulletin: ENGINE. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
- [16\-NA\-003](/bulletins/11014575.md), 2025-02-28, Service bulletin: ENGINE. This service bulletin provides repair information to correct a customer concern of a chirp, squeak noise heard coming from the rear of vehicle.
- [22\-NA\-074](/bulletins/11014233.md), 2025-02-12, Service bulletin: ENGINE. 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\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. 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.
- [20\-NA\-166](/bulletins/11013070.md), 2025-01-23, Service bulletin: ENGINE. This service bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.

JSON: [/v1/bulletins/10126409](/v1/bulletins/10126409)

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