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Service bulletin PI1477

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 id10113636
Published by NHTSA2017-08-15
Manufacturer's numberPI1477
Manufacturer's date2015-05-07
NHTSA componentSUSPENSION:FRONT

NHTSA's summary

This preliminary informational bulletin provides repair information to correct a customer concern of front end noise while driving over bumps or during low speed turns.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension

Vehicles listed
CHEVROLET EXPRESS2012
GMC SAVANA2012

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
05-03-08-002J2024-09-20. Service bulletin. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak.
05-03-08-002J2024-09-20. Service bulletin. This service bulletin provides information to dealership personnel on diagnosis and replacement of shock absorber and strut due to fluid leak.
15-00-89-004G2024-05-15. Service bulletin. This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
PIT5214F2023-12-18. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer?s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does not correct the customer complaint, contact General Motors Technical Assistance Center for further support. For any vehicles that remains unrepaired after being at the dealer for three days or more and a related bulletin or PI is not found, contact General Motors Technical Assistance Center for further support.
PIT52142023-12-04. Service bulletin. GM TAC Support of Vehicle Vibration Complaints.
12050B2023-12-04. Service bulletin. Rear Axle Grinding Noise, Vibration - Inspect Rear Axle
120310001B2023-12-04. Service bulletin. Vibration Shortly After Tires are Mounted/Preventing Vibration from Wheel Slip
120310001A2023-12-04. Service bulletin. Vibration Shortly After Tires are Mounted/Preventing Vibration from Wheel Slip
03-00-91-001I2023-11-22. Service bulletin. This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
15-00-89-004F2023-09-08. Service bulletin. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.