OBD error code U0284 Lost Communication With Active Grille Air Shutter 'A' Motor

Error description:

OBD Error Code U0284 "Lost Communication With Active Grille Air Shutter 'A' Motor" This means that there is a communication problem between the engine control module (ECM) and the active grille motor. The control unit does not receive a response to the request to the lattice actuator.

Such an active grille is typically used to regulate airflow to the radiator for optimal engine cooling and may be part of a fuel efficiency system.

Possible causes of malfunction:

1. Malfunction of the actuator (motor) of the grille:

   • Mechanical damage;
   • Leakage and moisture in the mechanism and electronic part;
   • Heavy wear of mechanisms.

2. Damage or interruption in the wiring:

   • Damage to the wiring to the motor;
   • Bad contact on the chips of the electric motor or ECM;
   • In rare cases, confused foams in places (after poor-quality restoration of electrical wiring).

3. Problems with the engine control unit:

   • Leakage of the ECM and damage to the electrical circuit;
   • The LIN or PWM bus microcircuit is damaged (due to a short circuit of the signal wire to plus 12V or mixed-up contacts).

After replacing the unit or executive mechanism (motor), it is necessary to adapt the new provisions with the help of diagnostic equipment.