B2726 on GMC: How to Diagnose & Fix
Transfer Case/4WD Switch Circuit (manufacturer-specific)
1 GMC model · 1 documented issue · 1 critical · $300-$800 repair
B2726 on GMC by model: symptoms, diagnosis and fix
The electronic steering column lock (ESCL) actuator in 2015-2020 Yukon XL models develops a clicking, popping, or grinding noise when turning the steering wheel, particularly at startup. In some cases, the ESCL prevents the vehicle from starting entirely, displaying a "Steering Column Lock" message. GM issued TSB 16-NA-012 acknowledging the issue. The ESCL motor gear teeth strip or the position sensor misreads, causing the lock to partially engage or fail to release.
Common Symptoms
- Clicking or popping noise from steering column on startup
- Vehicle will not start — Steering Column Lock message
- Grinding noise when turning the key or pressing start
- Intermittent no-crank condition
- Steering wheel feels temporarily locked after parking
How to Fix
Replace the electronic steering column lock actuator assembly (GM part 13501988). The replacement procedure requires disconnecting the battery, removing the lower steering column cover, and swapping the ESCL module. A Tech 2 or MDI scan tool relearn procedure must be performed after installation to program the new module to the BCM. Some owners have the ESCL permanently disabled via BCM programming at the dealer, though this may affect theft deterrent system operation.
Sources for this issue (1)
B2726 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B2726 mean on a GMC?
B2726 stands for "Transfer Case/4WD Switch Circuit (manufacturer-specific)." B2726 is a manufacturer-specific body code that is not widely documented in standard references. It falls in the same GM 4WD/transfer-case selector range as the adjacent B2725 code and generally indicates an invalid or out-of-range condition in a transfer case mode/range selector switch circuit. The exact subfault should be confirmed against the specific vehicle's service information before parts are replaced. On GMC it is documented across 1 model: Yukon XL.
What are the most common causes of B2726?
The most common causes of B2726 are: Faulty transfer case / 4WD selector switch, Worn or contaminated switch contacts, Damaged wiring in the switch circuit, Corroded or loose connector, Open or short in the signal circuit, Transfer case control module fault. The specific cause varies by vehicle.
How much does it cost to fix B2726 on a GMC?
Published repair estimates on GMC range from $300 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for B2726 on a different make?
View B2726 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.