2018 GMC Sierra Denali Technical Service Bulletins

948 technical service bulletins (TSBs) are on record for the 2018 GMC Sierra Denali. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10183132Oct 28, 2020Equipment, Engine cooling. This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
• 10183181Oct 27, 2020Equipment, Electrical system. This informational bulletin advises the technician to not replace the TMAP sensor, clean it using air or harsh chemicals but allow time for the sensor to thaw.
• 10183176Oct 27, 2020Fuel system, Equipment. This informational bulletin explains how to identify possible DEF contamination.
• 10183169Oct 27, 2020Brakes. This technical bulletin provides repair information to correct a customer concern of pulsing, grinding, scraping noise from brakes, uneven front brake pad wear.
• 10183151Oct 26, 2020Equipment, Engine. This informational bulletin explains how to check the NOx Catalyst Reductant-Load Adaptive Values using GSD2.
• 10183782Oct 23, 2020Transmission and drivetrain, Electrical system, Equipment. The intent of this technical 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.
• 10183153Oct 23, 2020Engine cooling, Fuel system. 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.
• 10183130Oct 23, 2020Equipment, Fuel system, Engine cooling. This bulletin provides information on common diesel engine tick noises and how they are considered part of normal operation and no parts should be replaced for these normal operating conditions.
• 10183126Oct 23, 2020Engine. This bulletin provides information on Engine Concerns that could result from lack of scheduled maintenance, improper service or aftermarket calibrations.
• 10183131Oct 22, 2020Engine cooling, Fuel system. This informational bulletin provides information on higher than expected oil consumption.
• 10182564Oct 22, 2020Equipment. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
• 10183779Oct 21, 2020Fuel system. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL.
• 10183162Oct 20, 2020Fuel system, Engine cooling. This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.
• 10183155Oct 19, 2020Fuel system, Other or unknown, Engine cooling. This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
• 10183150Oct 16, 2020Engine cooling, Equipment. This informational bulletin advises the technician of how the Soot information has changed from grams to percentage.
• 10183190Oct 15, 2020Transmission and drivetrain, Equipment. This Technical bulletin provides a repair to correct a condition of Shudder/Surging While Driving.
• 10183168Oct 13, 2020Fuel system. This informational bulletin advises the technician on what to do if the DEF pump has been replaced and perform a leak test to prime the pump.
• 10183202Oct 12, 2020Electrical system, Equipment. This informational bulletin explains how the regen works for the DEF system and how it works at different levels.
• 10183780Oct 9, 2020Equipment. This warranty administration bulletin provides information on Warranty Administration - Customer Concern Not Duplicated (CCND) Labor Operation Numbers.
• 10182545Oct 8, 2020Engine cooling. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
• 10183206Oct 6, 2020Exterior lighting, Electrical system. This service bulletin informs the technician to inspect for a possible electrical concern at the ECM X2 electrical connector to correct a customer concern of Malfunction Indicator Lamp (MIL) Illuminated - DTC P0333 Set.
• 10183213Oct 1, 2020Engine, Brakes. Special Coverage Adjustment - In some circumstances, some 2014-2018 model year Cadillac Escalade, Chevrolet Silverado, Chevrolet Suburban, Chevrolet Tahoe, GMC Sierra, and GMC Yukon vehicles may have a condition where customers may experience increased brake pedal effort, hard brake pedal, and/or potentially increased stopping distance. The condition is more prevalent at low speed when softly applying the brakes.
• 10181724Sep 30, 2020Equipment. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
• 10181675Sep 29, 2020Equipment, Body and structure. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA) (US dealers only).
• 10181720Sep 23, 2020Fuel system, Equipment. This technical bulletin provides a procedure to inspect and repair the fuel pressure sensor if found the cause of the customers concern.
• 10181672Sep 23, 2020Electrical system. This technical bulletin provides a procedure for testing the battery cables for voltage drop, Checking for a bad ground at g218, Inspecting for a short at the starter B+ to shield and testing for a faulty battery.
• 10181707Sep 22, 2020Engine cooling, Electrical system. This technical bulletin provides a procedure to program the ECM if found the cause of the customers complaint.
• 10181687Sep 18, 2020Electrical system. This technical bulletin provides a procedure to correct customer concerns of Instrument Panel Cluster (IPC) Gauges Inoperative, Numerous Driver information Center (DIC) Error Messages, No Brake or Electric Power Steering Assist, Transmission in Default Gear, No Reverse and/or Back Up Lights, No Daytime Running Lights (DRL), No Cruise or Adaptive Cruise and/or No Trailer Brake Lights.
• 10181695Sep 17, 2020Equipment, Electrical system. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
• 10181711Sep 10, 2020Fuel system, Other or unknown, Equipment, Engine. This technical procedure provides a procedure to replace the front oil crank seal on remanufactured engines only, if found the cause of the customers concern.
• 10181713Sep 9, 2020Transmission and drivetrain. This technical bulletin provides a repair procedure to correct a customer concern of Delayed and/or Harsh Engagement of Transmission Shift After Vehicle Sitting with Engine Off.
• 10181693Sep 9, 2020Transmission and drivetrain, Equipment. This Technical bulletin provides a repair to correct a condition of Shudder/Surging While Driving.
• 10181676Sep 9, 2020Fuel system. This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.
• 10181674Sep 9, 2020Equipment. This technical bulletin advised the technician to take the vehicle for a test drive to validate a possible normal TCC performance while under heavy specific driving maneuvers.
• 10181704Sep 3, 2020Engine, Electrical system. This technical bulletin provides a procedure to update the GPCM if found the cause of the customers concern.
• 10181660Sep 2, 2020Transmission and drivetrain. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
• 10180321Aug 21, 2020Engine cooling. This informational bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.
• 10180318Aug 17, 2020Fuel system. THis informational bulletin advises the tech of a possible plugged fuel breather vent and how to add a vent breather line to correct the customers concern.
• 10180697Aug 14, 2020Equipment. This Warranty Administration bulletin provides information on Global Warranty Management (GWM) Warranty Parts Center (WPC) Parts Return Program Information.
• 10180317Aug 14, 2020Tires. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
• 10180315Aug 12, 2020Electrical system. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
• 10180293Aug 10, 2020Transmission and drivetrain. This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed.
• 10180299Aug 5, 2020Equipment. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
• 10180307Aug 3, 2020Electrical system. This technical bulletin provides a procedure to correct customer concerns of Instrument Panel Cluster (IPC) Gauges Inoperative, Numerous Driver information Center (DIC) Error Messages, No Brake or Electric Power Steering Assist, Transmission in Default Gear, No Reverse and/or Back Up Lights, No Daytime Running Lights (DRL), No Cruise or Adaptive Cruise and/or No Trailer Brake Lights.
• 10179620Aug 3, 2020Electrical system. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
• 10178949Jul 28, 2020Transmission and drivetrain, Engine. This Bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
• 10178976Jul 27, 2020Transmission and drivetrain. This Technical bulletin provides a repair to correct a condition of Shudder/Surging While Driving.
• 10178387Jul 27, 2020Equipment, Engine. This Preliminary Information communication provides information to the technician about finding needle bearings during an oil change. Technician will gain access to the roller rockers to inspect them. Only replace the roller rocker that is missing needle bearings. Be sure to clean the oil drains to retrieve the needle bearings. Each roller rocker has 66 bearings.
• 10178385Jul 27, 2020Visibility (wipers, defrost, mirrors). This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
• 10178384Jul 24, 2020Electrical system. This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3060, and/or B3935. Technician should not replace any parts for this concern. If unable to duplicate the concern ask if the customer uses any Radio Frequency…

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