What Is the U0284 Code?
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The definition of code U0284 is “Lost Communication With Active Grille Air Shutter Module A,” although some vehicle manufacturers will list it as “Lost Communication With Active Grille Air Shutter 1 Motor Module.” This error code means your Controller Area Network bus (CAN) cannot communicate with the active grille shutter module. As a generic code, you can expect that the U0284 code can show up in just about any vehicle that has an active grille air shutter module.
More About Error Code U0284 Code
The active grille air shutter system, also just called the active grille shutter or grill shutter, is a way to improve aerodynamics for many vehicles. The active air shutter system, located at the front bumper lower opening, opens and closes the complete shutter assembly to carefully control the airflow that enters the engine compartment, usually opening at lower speeds to keep the engine cool and closing at higher speeds to reduce drag. To do this movement, it must communicate with other parts of the vehicle, including the fuel pump control module, chassis control module, body control module, powertrain control module (PCM), and engine control module (ECM). If your vehicle has lost communication with the module and isn’t seeing the control signal, it will log the U0284 code.
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What Are the Symptoms of a U0284 Code?
Most of the time, when this code appears, your vehicle has lost communication with the active grille air shutter module, which means the grille will be stuck in either the closed or the open position. If the grille is stuck closed, you may see issues with higher engine temperatures, especially at lower speeds. If it’s stuck open, you may see lowered fuel efficiency, especially once you get past about 40 miles per hour. These are usually the most common symptoms of the U0284 no-comm code, as this system isn’t usually critical enough to cause extremely severe drivability problems.
You will also usually see the check engine light turn on, although this might be a “soft code” or “hidden code” in some vehicles. This may mean you won’t see the light turn on due to the communication failure. If it becomes a “permanent code,” which may occur if it sets multiple times in a row, it’s more likely to become an engine light code.
What Are Some Causes of a U0284 Code?
There are only a few common causes of DTC U0284. Most of the time, this code occurs because you’re dealing with a faulty active grille air shutter system, a problem with the wiring harness for the module, or some other kind of circuitry and electrical connection issue surrounding the code, such as broken communications wires. Occasionally, road damage and other debris can get stuck in the front grill, which can also adversely affect operation. Front impact damage, including a vehicle collision, can also cause the same kind of damage. There may be a problem with your CAN bus or PCM in some very rare cases, but this is not a common issue.
How Serious Is the U0284 Code?
DTC U0284 is not necessarily extremely serious by itself. This isn’t a critical part of your vehicle, so it won’t usually set the vehicle into Limp Mode, a failsafe mode, or create a no-start condition. However, it will impact your vehicle’s fuel economy, especially once you get past 40 miles per hour. It’s a good idea to talk to a professional about the U0284 code to ensure you’re not wasting money on gas.
Can I Still Drive with a U0284 Code?
You can still drive when the U0284 code is active. This isn’t usually an extremely severe problem but it is still genuine. You should never leave any trouble codes lingering without addressing them, as there’s a reason they turn on your check engine light and other malfunction indicator lamp lights. By handling the problem right now, you can avoid any engine damage that you might experience from continuing to run a loss of communications code without the extra benefit of the active air grille shutter system.
How Easy Is It to Diagnose a U0284 Code?
Diagnosis for a U0284 code can sometimes be difficult because it’s uncommon for DIYers to deal with the actual core modules when handling issues within a vehicle. Diagnosing a U0284 code requires understanding various wiring connections within your vehicle. You need to check the module itself as well as the wires connecting to that module. You probably won’t have much experience with code U0284, as it’s not common. To diagnose DTC U0284, most people will seek help from a certified mechanic for shutter replacement or management of the air shutter actuator.
How Difficult Is It to Inspect a U0284 Code?
As with the diagnostic process, inspecting DTC U0284 can also be difficult. You’ll need a code scanner, but you might need plenty of other tools. You’ll need reliable vehicle information, such as technical service bulletins, wiring diagrams, and repair guides, if you want to know the actual problem. If you want to get a fix without needing a follow-up repair in the future, it’s often best to leave this code to a professional mechanic.
Need Additional Help with Your U0284 Code?
Most people need additional help with DTC U0284, and the experts are more than happy to get you a solution.
First, find an auto repair shop in your area. An auto repair shop will ensure you get the help you deserve while not having to go too far out of your way.
Second, you should check out the OBD-II database at KBB.com. Sometimes, this isn’t the only problem in your vehicle, and other diagnostic trouble codes will help you get to the bottom of the issue. This database is a great way to understand the other codes as well.
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