2014 & 2015 G.M. 5.3L – P0420/P0430 efficiency complaints 

G.M. Bulletins pertaining to possible premature failures on converter:

Condition:

P0420/P0430 - MIL light for efficiency

PIP5232C - broken grounds

PIP3119N – not completed (after converter replacement)

#20-NA-065 (replaces PIP4925B) leak

detection
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Recall # 14390: Special Coverage Adjustment - Police Package Hot Ambient Driveability Issues  (3 yrs/150k) - after this time it is customer pay.

condition:
Police Package Hot Ambient Driveability Issues Models: 2012-2014 Chevrolet Tahoe Police Pursuit Vehicles (RPO PPV) and Special Service Trucks (RPO 5W4) with 5.3L LMG Engine

Condition:

On some 2012-2014 model year Chevrolet Tahoe vehicles equipped with RPO PPV or 5W4, under certain operating conditions, some police package vehicles have experienced infrequent engine-idle problems and momentary poor low-speed engine performance. These performance issues can be triggered if both of the following conditions are satisfied: (i) the vehicle is operated in ambient temperatures that either exceed 100 degrees Fahrenheit in a low-humidity environment or that exceed 85 degrees Fahrenheit in a high-humidity environment; and (ii) the vehicle is operated at idle for a long period of time, at idle after heavy powertrain usage, or with a heavy electrical load.
The condition causes engine-idle RPM fluctuations (450-1000 RPM) and hesitation during acceleration. While GM has received some field reports of engine stalls at idle, GM has not been able to confirm these reports. GM has only been able to duplicate a similar stall by operating a test vehicle at a temperature that is at the limit of the fuel's high-temperature specification. If such a stall did occur, the stall would be at idle or low speed, and all electrical and safety systems would continue to function as designed.
Recall # 14390 continued…

Service procedure under this recall:

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Recall # 14858: Product Emission - High Pressure Fuel Pump Possible Leak - (Feb 19, 2015)

Subject: 14858 - High Pressure Fuel Pump Possible Leak Models: 2015 Cadillac Escalade, Escalade ESV 2014 Chevrolet Silverado LD 2015 Chevrolet Silverado LD, Suburban, Tahoe 2014 GMC Sierra LD 2015 GMC Sierra LD, Yukon, Yukon XL Equipped with 8-cylinder Engine (RPO L83 or L86) or 6-cylinder Engine (RPO LV3) 2015 Chevrolet Corvette Equipped with 8-cylinder Engine (RPO LT1)

All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle.

Condition

** General Motors has decided to conduct a Voluntary Emission Recall involving certain 2014-2015 Chevrolet Silverado LD; 2014-2015 GMC Sierra LD; 2015 Cadillac Escalade and Escalade ESV; 2015 Chevrolet Suburban and Tahoe; 2015 GMC Yukon and Yukon XL vehicles equipped with an 8 -cylinder Engine (RPO L83 or L86) or a 6-cylinder Engine (RPO LV3), and certain 2015 model year Chevrolet Corvette vehicles equipped with an 8-cylinder engine (RPO LT1). The high pressure fuel pump may leak resulting in fuel odor and increased evaporative emissions. The engine may also fail to start or provide less power when driven due to insufficient fuel pressure.

Correction
Replacement items under this recall:
- intake manifold gasket
- intermediate fuel feed pipe
- Fuel pump

As a side note:

G.M. does recommend:

#05-06-04-022T –Top-tier fuel