18036: Service Update – Stalk Incorrect with Auto High Beam – 2018 GMC Terrain Denali

#18036: Service Update – Stalk Incorrect with Auto High Beam – (Feb 19, 2018)

Subject: 18036 — Stalk Incorrect with Auto High Beam
Models: 2018 GMC Terrain Denali

Reference Number: N172146190 Release Date: February 2018
Revision: 00
Attention: This service update includes vehicles in dealer inventory and customer vehicles that return to the dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited Warranty period.
Make Model Model Year RPO Description
From To
GMC Terrain Denali 2018 2018

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections and/or repairs.

Condition Certain 2018 model year GMC Terrain Denali vehicles without an auto high beam option (RPO TQ5) may have been assembled with the incorrect high beam turn signal multifunction switch (TMFS). When customers press the auto high beam button on the high beam TMFS switch nothing will happen. High beams will operate if the customer push/pulls the TMFS.
Correction Dealers are to replace the TMFS, and inform the customer that their vehicle is not equipped with the auto high beam feature.


Parts Information

Quantity Part Name Part No.
1 (If Required) Switch – Turn Signal 23354978

Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts to confirm RIM managed status. Parts may have quantity limiters in effect.


Warranty Information

Labor Operation Description Labor Time Trans. Type Net Item
9103632 Inspect Turn Signal Switch (No Further Action Required) 0.2 ZFAT N/A
9103633 Replace Turn Signal Switch (Includes Inspection) 0.2 ZFAT N/A


Service Procedure

auto high beam switch (1)

Inspect the turn signal switch and confirm that it is equipped with the auto high beam switch (1).

  • If the auto high beam switch is NOT INSTALLED, no further action is required.
  • If the auto high beam switch IS INSTALLED, replace the turn signal switch. Refer to Turn Signal Switch Replacement (Terrain) in SI.


Dealer Responsibility

Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility for service in the future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be sure the service update correction has been made before selling or releasing the vehicle.

All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration, or any other purpose.

All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within the CPOIS system, or once again be used in the CTP program.


One thought on “18036: Service Update – Stalk Incorrect with Auto High Beam – 2018 GMC Terrain Denali

  1. I purchased this 2018 GMC Terrain vehicle and it had this recall. I asked the dealer NOT to implement this recall simply because the feature works. I used it. It worked fine. He said it wont work and removed the stalk. I have become a very dissatisfied GM customer. This is my first return to GM since 1999 Pontiac Grandprix( a good car, btw). I had them reinstall the stalk, but they wouldn’t reprogram the ECM, they claimed it shouldn’t be required. Incompetence.
    3 errors in my judgement:
    1. GM shouldn’t have invoked recall for cars that the auto high beam feature worked. Their mistake installing it in first place. Eat it, suck it up. inexpensive part as it is. Unheard of for manufacturer removing a working feature for ANY product already sold!
    2. Dealer should abide by customer request not to implement recall.
    3. Dealer service manager was incompetent and arrogant.

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