WenmarOpen by Wenmar Pro

Service bulletin PIP-4895

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 id10038606
Published by NHTSA2011-06-24
Manufacturer's numberPIP-4895
Manufacturer's date2011-03-01
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM

NHTSA's summary

GM: THERE MAY BE COMPLAINTS THAT THE LOW COOLANT LIGHT IS ON, LOSS OF COOLANT, OR EXCESSIVE PRESSURE. THERE ARE NO EXTERNAL LEAKS. *RM

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, Cooling system

Vehicles listed
CHEVROLET EXPRESS2010, 2011
CHEVROLET SILVERADO2010, 2011
GMC SANANA2010
GMC SAVANA2010, 2011
GMC SIERRA2010, 2011

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

Other bulletins for the same vehicles and component
PI1164B2021-09-07. Service bulletin. Reduced Engine Power with Service engine message displayed and DTC P2263 Set
18NA1032020-11-30. Service bulletin. This service bulletin provides information to correct a customer concern of an in-tank fuel pump whining noise, engine hard to start and/or stalls and Malfunction Indicator Lamp (MIL) is illuminated.
PIP5684B2020-08-10. Service bulletin. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
PI1164A2018-12-10. Service bulletin. This preliminary bulletin provides information on how to check for ice and/or snow build up and to install a radiator cover to correct the customers concern of reduced engine power and service engine message on.
PIP4482C2017-08-15. Service bulletin. This Preliminary Information communication advises the technician of two types of DEX-COOL 50/50 Premix are available through General Motors Service Parts Operations, one with bitterant and one without. Bitterant is a chemical that is added to products to make them smell or taste extremely bitter and is required in some states, such as California, Oregon, New Mexico, Colorado, and Vermont.
PIP51082017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have an audible engine whine noise at 1500-1800 revolutions per minute. Technician will need to check the coolant level, remove serpentine belt to verify noise goes away, rotate the thermostat 90 degrees and retest, then replace thermostat and retest. Technician will replace the water pump if replacing the thermostat does not repair the audible engine whine noise.
PIP4158E2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have low oil pressure, no oil pressure, and/or engine noise. Technician will need to replace the oil pump, flush the oil cooler lines.
PIP51522016-04-26. Service bulletin. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
PI06992012-05-01. Service bulletin. GM: GAUGE FLUCTUATION, VARIOUS DTCS, AND THE WIRING HARNESS MAY BE CHAFING/RUBBING ON A/C LINE. *JS UPDATED 5/22/12. *JS UPDATED 2/5/16. *PE
PIP-48222011-03-14. Service bulletin. CHEVROLET/GMC: POSSIBLE ENGINE OVERHEAT OR LOSS OF COOLANT. NORMAL SI DIAGNOSTICS WILL LEAD TO INSPECTING THE WATER PUMP FOR PROPER OPERATION. WHEN WATER PUMP IS REMOVED, BE SURE TO INSPECT THE IMPELLER. *PE