Service bulletin PIP4786C

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)
Type	Service bulletin
NHTSA id	10083080
Published by NHTSA	2016-10-20
Manufacturer's number	PIP4786C
Manufacturer's date	2016-08-15
NHTSA component	ENGINE AND ENGINE COOLING

NHTSA's summary

THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE LOW OIL PRESSURE MESSAGE. TECHNICIAN MAY ALSO FIND A DIAGNOSTIC TROUBLE CODE P0521 IN THE ENGINE CONTROL MODULE. TECHNICIAN SHOULD FOLLOW ALL PUBLISHED SERVICE INFORMATION DIAGNOSIS. WHEN USING A SCAN TOOL IF THE OIL PRESSURE IS LOW BUT THE OIL PRESSURE AT THE OIL FILTER HOUSING IS CORRECT, TECHNICIAN SHOULD INSPECT THE VALVE LIFTER OIL FILTER FOR DEBRIS/SLUDGE THAT COULD BE RESTRICTING OIL FLOW TO THE OIL PRESSURE SENSOR. TECHNICIAN SHOULD REMOVE THE VALVE LIFTER OIL FILTER AND CLEAN IT. IF THE VALVE LIFTER OIL FILTER CANNOT BE CLEANED REPLACE IT.

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

Trouble codes named

P0521

Vehicles listed
BUICK ALLURE	2006, 2007, 2008, 2009
BUICK CASCADA	2016
BUICK CENTURY	2005
BUICK ENCLAVE	2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
BUICK ENCORE	2013, 2014, 2015, 2016
BUICK ENVISION	2016
BUICK LACROSSE	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
BUICK LESABRE	2005
BUICK LESABRE	2006
BUICK LESABRE	2013
BUICK LUCERNE	2006, 2007, 2008, 2009, 2010, 2011
BUICK LUCERNE	2012
BUICK PARK AVENUE	2005
BUICK RAINIER	2005, 2006, 2007
BUICK REGAL	2005
BUICK REGAL	2008 to 2010
BUICK REGAL	2011, 2012, 2013, 2014, 2015
BUICK RENDEZVOUS	2005, 2006, 2007
BUICK TERRAZA	2005, 2006, 2007
BUICK TERRAZA	2008
BUICK VERANO	2012, 2013, 2014, 2015
CADILLAC ATS	2013, 2014, 2015, 2016
CADILLAC ATS-V	2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC CT6	2013 to 2015
CADILLAC CT6	2016
CADILLAC CTS	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CADILLAC CTS-V	2005, 2006, 2007 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC CTS-V	2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC DEVILLE	2005
CADILLAC DTS	2005
CADILLAC DTS	2006, 2007, 2008, 2009, 2010, 2011
CADILLAC DTS	2012
CADILLAC ELR	2014, 2015, 2016
CADILLAC ESCALADE	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CADILLAC ESCALADE ESV	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE EXT	2007, 2008, 2009, 2010, 2011, 2012, 2013 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE EXT 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE HYBRID	2008, 2009, 2010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC ESCALADE HYBRID	2014 (the catalog's model; the bulletin names a series or trim of it)
CADILLAC SRX	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CADILLAC STS	2005, 2006, 2007, 2008, 2009, 2010, 2011
CADILLAC XLR	2005, 2006, 2007, 2008, 2009
CADILLAC XT5	2013 to 2016
CADILLAC XTS	2013, 2014, 2015, 2016
CHEVROLET ASTRO	2005
CHEVROLET AVALANCHE	2007, 2008, 2009, 2010, 2011
CHEVROLET AVALANCHE 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET AVALANCHE 2500	2005, 2006, 2007 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET AVALANCHE 2500	2013 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET AVEO	2005, 2006, 2007, 2008, 2009, 2010, 2011
CHEVROLET AVEO	2013
CHEVROLET BLAZER	2005
CHEVROLET BLAZER	2006 to 2009
CHEVROLET C4500	2005 to 2009
CHEVROLET C4500 NA	2008
CHEVROLET C5500	2005 to 2008
CHEVROLET C6500	2005 to 2009
CHEVROLET C7500	2005 to 2009
CHEVROLET C7500NA	2008
CHEVROLET C8500	2005 to 2009
CHEVROLET CAMARO	2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET CAPRICE	2011 to 2016
CHEVROLET CAPRICE POLICE PURSUIT	2012 to 2016
CHEVROLET CAPTIVA	2008
CHEVROLET CAPTIVA	2011 to 2015
CHEVROLET CAPTIVA SPORT	2009
CHEVROLET CAPTIVA SPORT	2012
CHEVROLET CAVALIER	2005
CHEVROLET CHEVEROLET SS	2014 to 2016
CHEVROLET CITY EXPRESS	2015, 2016
CHEVROLET CLASSIC	2005
CHEVROLET COBALT	2005, 2006, 2007, 2008, 2009, 2010
CHEVROLET COBALT	2011
CHEVROLET COBALT SS	2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET COLORADO	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
CHEVROLET COLORADO	2013
CHEVROLET COLORADO	2015, 2016
CHEVROLET CORVETTE	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET CORVETTE Z06	2005, 2006, 2007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET CORVETTE ZR1	2009 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET CRUZE	2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET DENALI	2005 to 2006
CHEVROLET EPICA	2005
CHEVROLET EQUINOX	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET EXPRESS	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET EXPRESS 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 1500	2014 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 2500	2005, 2006, 2007, 2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 2500	2014 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 3500	2005, 2006, 2007, 2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 3500	2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 3500	2014 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 4500	2009 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 4500	2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS 4500	2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET EXPRESS CUTAWAY VAN	2006, 2007, 2008 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET F SERIES	2005 to 2006
CHEVROLET G VAN BUS	2005 to 2008
CHEVROLET G VAN BUS	2010 to 2011
CHEVROLET G1500	2005 to 2008
CHEVROLET G2500	2005
CHEVROLET G3500	2005
CHEVROLET G3500	2008
CHEVROLET HHR	2006, 2007, 2008, 2009, 2010, 2011
CHEVROLET IMPALA	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET IMPALA (GMX 211)	2006 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET INCOMPLETE/CUTAWAY C3	2005
CHEVROLET LOW CAB FORWARD 3500	2016
CHEVROLET LOW CAB FORWARD 4500	2016
CHEVROLET LOW CAB FORWARD 5500	2016
CHEVROLET LUMINA	2008
CHEVROLET LUMINA	2014
CHEVROLET MALIBU	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET MALIBU CLASSIC	2005
CHEVROLET MALIBU CLASSIC	2007 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET MALIBU ECO	2013, 2014 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET MALIBU HYBRID	2008, 2009, 2010 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET MALIBU HYBRID	2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET MALIBU MAXX	2005, 2006, 2007 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET MONTE CARLO	2005, 2006, 2007
CHEVROLET MONTE CARLO	2008
CHEVROLET MONTE CARLO	2010
CHEVROLET OPTRA	2005, 2006, 2007
CHEVROLET OPTRA	2016
CHEVROLET ORLANDO	2012, 2013, 2014, 2015
CHEVROLET S/T BLAZER	2005
CHEVROLET S10	2005 to 2007
CHEVROLET SILVERADO 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 1500 HD	2005 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 2500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SILVERADO 3500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SONIC	2011
CHEVROLET SONIC	2012, 2013, 2014, 2015, 2016
CHEVROLET SPARK	2013, 2014, 2015, 2016
CHEVROLET SPARK EV	2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SSR	2005, 2006
CHEVROLET SSR	2007
CHEVROLET SUBURBAN	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET SUBURBAN 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN 2500	2005, 2006 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET SUBURBAN 2500	2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET T6500	2005 to 2009
CHEVROLET T7500	2005 to 2009
CHEVROLET T8500	2005 to 2009
CHEVROLET TAHOE	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET TAHOE HYBRID	2008, 2009, 2010, 2011, 2012 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TAHOE POLICE PURSUIT	2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRAILBLAZER	2005, 2006, 2007, 2008, 2009
CHEVROLET TRAILBLAZER	2013 to 2014
CHEVROLET TRAILBLAZER 360	2005, 2006, 2007, 2008, 2009 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRAILBLAZER EXT	2006 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRAILBLAZER EXT 370	2005, 2006 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET TRANS SPORT	2005
CHEVROLET TRAVERSE	2008
CHEVROLET TRAVERSE	2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET TRAX	2013, 2014, 2015, 2016
CHEVROLET UPLANDER	2005, 2006, 2007, 2008, 2009
CHEVROLET VENTURE	2005
CHEVROLET VOLT	2011, 2012, 2013, 2014, 2015, 2016
CHEVROLET W SERIES C3 3500	2006 to 2007
CHEVROLET W-SERIES	2005 to 2011
CHEVROLET W3500	2005 to 2010
CHEVROLET W4500	2005 to 2010
CHEVROLET W5500	2005 to 2010
GMC ACADIA	2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
GMC C4500	2005 to 2009
GMC C5500	2005 to 2009
GMC C6500	2005 to 2009
GMC C7500	2005 to 2009
GMC C8500	2005 to 2009
GMC CANYON	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
GMC CANYON	2015, 2016
GMC ENVOY	2005, 2006, 2007, 2008, 2009
GMC ENVOY	2010 to 2013
GMC ENVOY 360	2005, 2006, 2007, 2008, 2009 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY DENALI	2006, 2007 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY DENALI XL	2006 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY XL	2006 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY XL 370	2005, 2006 (the catalog's model; the bulletin names a series or trim of it)
GMC ENVOY XUV	2005 (the catalog's model; the bulletin names a series or trim of it)
GMC EXPRESS	2009
GMC F SERIES	2005 to 2006
GMC G VAN BUS	2006 to 2011
GMC G1500	2005 to 2008
GMC G2500	2005
GMC G3500	2005
GMC JIMMY CLASSIC	2005
GMC SAFARI	2005
GMC SAFARI (GMC)	2005 (the catalog's model; the bulletin names a series or trim of it)
GMC SANANA	2010
GMC SAVANA	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
GMC SAVANA 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 2500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 3500	2005, 2006, 2007, 2008, 2009, 2010, 2011 (the catalog's model; the bulletin names a series or trim of it)
GMC SAVANA 3500	2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 1500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 1500 HD	2005 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 2500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SIERRA 3500	2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 (the catalog's model; the bulletin names a series or trim of it)
GMC SONOMA	2005 to 2006

And 91 more lines, in the JSON.

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

Recalls for the same vehicles and component
16V868000	2016-12-02. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
2014577	2014-12-18. Engine
14V007000	2014-01-13. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
06V289000	2006-08-03. ENGINE AND ENGINE COOLING

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
00-06-01-026R	2025-12-03. Service bulletin. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
23-NA-153	2025-10-25. 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-080	2025-10-16. Service bulletin. This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.
15-NA-010	2025-07-07. Service bulletin. 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.
18-NA-069	2025-05-06. Service bulletin. This service bulletin provides a service procedure to correct conditions of Poor Engine Performance in Extremely cold weather conditions, CAC Icing, MIL Illuminated with DTCs set.
25-NA-052	2025-04-28. Service bulletin. 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	2025-04-10. Service bulletin. 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	2025-02-28. Service bulletin. 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	2025-02-12. 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-043	2025-02-12. 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.