Iveco 022B – EDC (Electronic Diesel Control): Power circuit fault glow

The engine control system has detected an electrical failure, short, or open circuit in the power supply circuit that operates the engine's glow plugs.

• Iveco Daily
• Iveco Stralis
• Iveco Trakker
• Iveco Tector
• Iveco Massif

1. 1

   Turn the ignition to the glow position and check if the dashboard glow plug indicator light illuminates (note: system typically only activates below 10°C/50°F)

2. 2

   Locate the glow plug control relay and test the output terminals with a multimeter to verify voltage is sent to the glow plugs when ignition is on

3. 3

   Disconnect the wiring harness from the glow plugs and test each plug's resistance with a multimeter (infinite resistance indicates a dead plug)

4. 4

   Inspect the wiring harness and connectors between the EDC, the glow plug relay, and the glow plugs for corrosion, melted pins, or chafing

1. 1

   Disconnect Power

   Disconnect the negative battery terminal before working on the electrical system.

2. 2

   Inspect and Replace the Relay

   The most common cause is a failed or 'pasted' (stuck) glow plug control relay/module. Locate the module in the engine bay, disconnect the wiring pigtail, and inspect for melted contacts. Install the replacement control module.

3. 3

   Replace Faulty Glow Plugs (If Necessary)

   If the relay is functioning but the plugs tested bad, they must be replaced. Apply a high-quality penetrating oil to the base of the glow plugs and let it soak for several days if possible. Attempt removal on a warm engine, using a torque wrench to ensure you do not exceed the plug's shear torque limit.

4. 4

   Clear Codes

   Reconnect the battery and use an OBD2 diagnostic scanner to clear the 022B fault code from the EDC.

5. 5

   ECU Reprogramming (Edge Case)

   If the EDC light continues to flash and the code will not clear despite new parts, the ECU may have registered a permanent 'pasted relay' fault requiring a specialized software reprogramming service to reset the EDC module.