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Service bulletin 16NA325

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 id10166637
Published by NHTSA2019-10-28
Manufacturer's number16NA325
Manufacturer's date2019-09-19
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

This technical bulletin provides a procedure on how to properly identify if there is any aftermarket calibrations loaded on the ECM or and detection of a power up hardware installed.

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

Electrical system

Vehicles listed
CHEVROLET COLORADO2016, 2017, 2018, 2019, 2020
CHEVROLET EXPRESS2017, 2018, 2019, 2020
GMC CANYON2016, 2017, 2018, 2019, 2020
GMC SAVANA2017, 2018, 2019, 2020

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

Recalls for the same vehicles and component
20232102023-04-06. Electrical
23V2470002023-04-06. ELECTRICAL SYSTEM:WIRING
19V6440002019-09-06. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; SEAT BELTS:FRONT:WARNING LIGHT/DEVICES
18V6550002018-09-21. ELECTRICAL SYSTEM

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
24-NA-2292025-06-03. Service bulletin. This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain.
25-NA-0872025-05-02. Service bulletin. This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
13-08-116-001K2025-04-25. Service bulletin. The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
24-NA-0982025-04-24. Service bulletin. This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.
23-NA-1652025-04-15. Service bulletin. This service bulletin provides repair information to correct a customer concern of Vehicle Will Not Lock and Unlock (Loss of Active Functions) Crank or Start (Loss of Passive Functions) with DTC P0513 Set.
15-06-03-001F2025-04-15. Service bulletin. This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
23-NA-1642025-04-11. Service bulletin. This service bulletin provides repair information to correct a customer concern of Vehicle Will Lock and Unlock (Active Functions Work) but Will Not Crank or Start (Loss of Passive Functions Do Not Work).
23-NA-1632025-04-10. Service bulletin. This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
23-NA-0642025-02-12. Service bulletin. This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Battery stand time of the vehicle during transit and or long period of stand time at the dealerships.
21-NA-0432025-02-12. 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.