P0382 Fault Code

Glow Plug/Heater Circuit B Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0382 fault code indicates a malfunction in the glow plug or heater circuit for cylinder bank B, which is essential for starting a diesel engine in cold temperatures. This code typically arises when the engine control module (ECM) detects a failure in the glow plug system's functionality, whether due to electrical issues or component failures.

What are the symptoms of the P0382 code?

• Engine may have difficulty starting, particularly in cold weather
• Rough idling or misfiring after engine starts
• Increased exhaust emissions
• Dashboard warning lights may illuminate, including check engine light

What causes the P0382 code?

• Faulty glow plugs in cylinder bank B
• Issues in the wiring or connections related to the glow plug circuit
• A malfunctioning glow plug relay
• Problems with the engine control module (ECM)
• Blown fuses protecting the glow plug circuit

How to fix P0382?

• Inspect and test each glow plug in cylinder bank B for functionality; replace if defective.
• Check wiring and connectors for damage, corrosion, or loose connections; repair or replace as needed.
• Test the glow plug relay for proper operation and replace if faulty.
• Examine fuses related to the glow plug circuit and replace any that are blown.
• If all components check out, consider reprogramming or replacing the ECM after consultation with a professional.