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Service bulletin PIP5420

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 id10099841
Published by NHTSA2017-05-19
Manufacturer's numberPIP5420
Manufacturer's date2016-09-09
NHTSA componentEQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

NHTSA's summary

THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT HAVE A SPARK KNOCK NOISE ON SLIGHT ACCELERATION AND THAT THIS CONDITION MAY BE MORE NOTICEABLE UPHILL OR WHILE UNDER LOAD, AND THAT DIAGNOSTIC TROUBLE CODE P0326 MAY BE STORED IN HISTORY AS WELL. DEALER SHOULD ROAD TEST THE VEHICLE TO DUPLICATE THE CONCERN AND IF IT CAN BE DUPLICATED CAPTURE A SESSION FILE WITH GLOBAL DIAGNOSTICS SYSTEM 2 AND CONTACT GENERAL MOTORS TECHNICAL ASSISTANCE TO OPEN A CASE AND UPLOAD THE FILE. TECHNICIAN MAY THEN CLEAR THE CODES AND RELEASE THE VEHICLE TO THE CUSTOMER, NOTIFYING THEM THAT THE USE OF PREMIUM FUEL MAY TEMPORARILY CORRECT THE CONDITION.

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

Equipment and accessories, Labels and manuals

Trouble codes named

P0326

Vehicles listed
CHEVROLET COLORADO2015, 2016
GMC CANYON2015, 2016

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

Recalls for the same vehicles and component
20155752015-11-30. Accessories

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
20-NA-1322024-04-23. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
17-NA-0522024-04-23. Service bulletin. This bulletin updates the position of General Motors on refinishing aluminum wheels. GM has determined that wheel refinishing under warranty will no longer be performed.
20-NA-1322024-04-05. Service bulletin. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
PIT5401E2024-04-01. Service bulletin. Radio Inoperative with No Communication and DTC U0184
PIT53582024-04-01. Service bulletin. Repetitive Popping Noise From All Speakers.
PIT53572024-04-01. Service bulletin. VIS / GWM / IVH May Not Match Actual Audio System of Vehicle.
PIT53542024-04-01. Service bulletin. Identifying If A Vehicle Is Equipped With OnStar 4G LTE Wi-Fi.
PIT53532024-04-01. Service bulletin. XM Audio Traffic And Travel Link Availability And Operation.
23-NA-1032024-03-29. Service bulletin. This service bulletin provides information on submitting quality Photos of Various Vehicle Concerns to the GM Technical Assistance Center (TAC).
11-00-89-005X2024-03-19. Service bulletin. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).