If you recently brought home a brand new General Motors midsize crossover and your dashboard is already lighting up with all-wheel drive errors, take a deep breath. You are not alone.

My brother Josh actually just picked up a 2025 Buick Enclave for his family, and the minute I saw this bulletin come across my desk, I had to give him a call to warn him.

General Motors just issued a new technical service bulletin detailing a frustrating but manageable software glitch in the AWD systems of their newest family haulers. Before you let a dealership tear into your drivetrain or replace expensive modules, let’s walk through exactly what is going on, what these computer codes actually mean, and how to handle it if this glitch hits your vehicle.

The Bottom Line: Quick Facts

  • Affected Vehicles: 2024 through 2026 Chevrolet Traverse equipped with the LK0 engine, 2024 through 2026 GMC Acadia, and 2025 through 2026 Buick Enclave.
  • The Symptom: A “Service All Wheel Drive” or “Service 4WD” message appears on your driver information center right when you start the car.
  • The Code: Technicians scanning your car will find a U3000 Sym 92 code set as a current or history error in the K47 Rear Drive Control Module.
  • The Fix: Do not let the dealer replace the module. GM is investigating a software update and currently recommends a simple 20-minute battery disconnect to temporarily clear the error and recover AWD functionality.

Table of Contents

What is a Technical Service Bulletin?

First, it helps to understand exactly what you are reading. This document is a Technical Service Bulletin, specifically PIT6502A. A TSB is very different from a safety recall. A recall means the government or the automaker has determined a vehicle is unsafe and must be fixed by law. A TSB is simply an internal instruction manual sent from GM engineering directly to dealership mechanics. It tells them how to quickly diagnose and fix a known, common issue without wasting time or throwing unnecessary parts at the car.

A red 2025 Buick Enclave ST parked on a paved driveway next to a white gazebo and trees with early autumn leaves.
The 2025 Buick Enclave is one of the new GM crossovers affected by a software glitch that triggers a “Service All Wheel Drive” warning and disables the AWD system on startup.

The Symptoms: Dead AWD on Startup Explained

According to this recent bulletin, owners are experiencing a sudden loss of all-wheel drive functionality. The issue usually pops up the moment you start the vehicle. Right at the initial ignition on cycle, your dashboard will flash a “Service All Wheel Drive” or “Service 4WD” warning. If you try to use the system, you will quickly find out that the all-wheel drive is completely disabled and locked out. Your vehicle will still drive safely, but it will be operating strictly as a front-wheel drive vehicle until the error is cleared.

When you take your crossover to the dealership, technicians will plug a scanner into your car and find a specific diagnostic trouble code: U3000 Sym 92. This code sets as either a “current” or “history” error in the K47 Rear Drive Control Module (RDCM).

To put it simply, the RDCM is the computer brain located near your rear axle. It controls the clutch pack that physically connects power to your rear wheels. A “current” code means the computer is actively seeing the glitch right now. A “history” code means the glitch happened a few days ago, but the computer remembered it. Either way, this software bug is causing the module to panic and shut down the rear drive system to protect itself.

The Warning: Do Not Replace the Module

Here is where you need to be an informed owner. Dealerships have naturally been trying to fix this by replacing the entire Rear Drive Control Module. To save everyone time and frustration, General Motors has officially issued a part restriction to stop these unnecessary part replacements.

GM explicitly states in their dealer instructions that if the U3000 SYM 92 code is set without any other RDCM related codes, technicians must absolutely not replace the module. A brand new module will not resolve your concern. The new hardware will function exactly the same way as your current one, meaning the computer error will just come right back.

Important Note: This specific restriction applies to standard AWD models built with the F48 option and without the G99 option. If you own a vehicle equipped with the advanced G99 twin-clutch system, like an Acadia AT4 or a Traverse Z71, normal diagnostic procedures still apply and your dealer should troubleshoot the hardware as usual.

A gray Chevrolet Traverse Z71 parked on a dirt road lined with snow and pine trees on a sunny winter day.
If your Traverse Z71 flashes a Service AWD message, normal dealership diagnostics are required. The G99 twin-clutch system found on the Z71 is not eligible for the temporary battery reset fix.

The Temporary Fix and Upcoming Software Update

So, what should you do if this error pops up while you are trying to get the kids to school or driving through bad weather? Right now, the official factory fix is a simple hard reset. GM instructs technicians to disconnect the vehicle’s battery for exactly 20 minutes to reset the module. This forces all the computers in the vehicle to shut down and reboot, clearing out the software loop that caused the error.

After reconnecting the battery, they must perform a full power up and power down cycle, log into the diagnostic system, and clear the codes out completely.

This global reset will recover your all-wheel drive functionality so you can get back to your normal routine. However, GM engineering is currently investigating the root cause and admits this is only a temporary fix. Dealerships are instructed to advise customers that they can absolutely continue driving the vehicle, but the fault might pop up again until an official software fix is developed and released. We will keep an eye on this and update you the moment GM engineering releases the final software patch.

Join the Conversation

Are you dealing with this U3000 code or trying to track down a software update for your new crossover? Do not navigate the dealership service department alone. Come join our forums and connect with thousands of other owners.

We have a highly active, dedicated 2024+ Traverse, Acadia, Enclave section where members are sharing real-time updates on dealership fixes, software patches, and ownership experiences. Sign up for free today and jump into the conversation to see how others are handling this exact issue.

Frequently Asked Questions

  • Why does my Chevy Traverse say Service All Wheel Drive? On 2024 through 2026 Chevrolet Traverse models, a software glitch in the K47 Rear Drive Control Module can cause a U3000 Sym 92 error code. This temporary bug forces the vehicle into front-wheel drive mode and triggers a dashboard warning.
  • How do you fix the U3000 code on a GMC Acadia? General Motors currently instructs technicians to disconnect the battery for 20 minutes to reset the computer modules and recover AWD functionality. A permanent software patch is currently being investigated by GM engineering.
  • Should the dealer replace the RDCM for a U3000 code? No. GM has placed a part restriction on the module because replacing the physical hardware will not solve a software issue. A new module will function the exact same way until the software update is available.
  • Does this affect the Acadia AT4 or Traverse Z71? The GM bulletin specifically targets standard AWD vehicles without the G99 option. If your vehicle is equipped with the G99 twin-clutch system found on AT4 and Z71 trims, dealerships are instructed to follow standard diagnostic procedures instead of the battery reset.