The Ford diagnostic trouble code (DTC) U0284:00-2F often appears after installing an aftermarket intercooler on a Focus ST. This code indicates a communication issue with the Active Grille Shutter (AGS) system. This article explains why this code occurs and provides solutions for addressing it.
Why Does DTC U0284:00-2F Occur?
Ford Focus ST models utilize active grille shutters located in front of the radiator and intercooler. These shutters improve aerodynamics and engine warm-up times. However, larger aftermarket intercoolers often require removing the entire AGS assembly. This removal leaves the AGS motor connector unplugged, triggering the U0284:00-2F code.
Understanding the Impact of DTC U0284:00-2F
This DTC is considered a “soft” code, meaning it doesn’t illuminate the check engine light (CEL). However, it can still cause issues:
- State Inspections: Some jurisdictions may fail vehicles with this code present during inspections.
- Environmental Contamination: The exposed connector is vulnerable to dirt, salt, and moisture, leading to corrosion. This corrosion can affect the LIN BUS communication network, potentially causing problems with other components like the alternator. Many have mistakenly replaced alternators, batteries, and cables due to undiagnosed AGS connector corrosion.
Solutions for Ford DTC U0284:00-2F
There are two primary solutions for addressing this code:
1. Reinstall the AGS Motor
The simplest fix is to reconnect the AGS motor:
- Remove the AGS motor from the discarded shutter assembly.
- Plug the motor back into its connector.
- Secure the motor out of the way, for instance, under the driver-side headlight using a zip tie.
This method eliminates the DTC and requires no calibration. This prevents corrosion and potential electrical issues.
2. Disable the AGS System
If the AGS system has been disabled via tuning software, consider permanently removing the connector:
- Cut out the AGS connector entirely.
- Properly insulate the exposed wiring.
This prevents future corrosion issues that temporary solutions like taping might not prevent.
Finding a Replacement AGS Motor
While the entire AGS assembly must be purchased new (Ford part number BM51-8476-AB), used AGS motors are available online. Search for this part number on eBay or other used parts marketplaces. The same motor is used across multiple Ford models, typically ranging from 2013-2018. Ensure compatibility with your specific Focus ST model year. Prices for used motors typically range from $35 to $100 USD.
Conclusion
Addressing the Ford Dtc U0284:00-2f is crucial to avoid potential electrical issues and ensure your Focus ST passes inspection. By either reconnecting the AGS motor or properly removing the connector, you can prevent corrosion and maintain the reliability of your vehicle’s electrical system. Choose the solution that best fits your modification and maintenance preferences.
