P0380 - Glow Plug/Heater Circuit A

The ECM detected a fault in glow plug or heater circuit A.

Code Overview

The ECM detected a fault in glow plug or heater circuit A.

Common Causes

• Failed glow plug or heater element
• Relay, fuse, or wiring issue
• Control module fault

Diagnostic Steps

1. Check fuse, relay, and power feed to the heater circuit
2. Inspect harness and connector condition
3. Test glow plug or heater resistance if applicable

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.