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2014 RAM 2500
6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
16 active safety recalls on this vehicle — view recalls🏆Sponsored by Lost Pines Precision Automotive· Bastrop, TX
Repairs436Labor519Torque3583Fluid10DTC1037Battery1Maintenance0Recalls16
P0380moderate severityPowertrain

Glow Plug/Heater Circuit A

on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD

What this code means

Malfunction in the glow plug heating circuit. Glow plugs are used in diesel engines to preheat the combustion chamber for cold starting.

Symptoms

  • Check Engine Light
  • Hard cold starting
  • White smoke on cold start
  • Extended cranking
  • Rough idle when cold

Common causes

  • Faulty glow plug(s)
  • Glow plug relay failure
  • Glow plug module failure
  • Wiring damage
  • Blown fuse

Diagnostic steps

  1. Test individual glow plug resistance (typically 0.5-2 ohms)
  2. Check glow plug relay
  3. Test glow plug module
  4. Check fuse
  5. Inspect wiring

Repair notes

Test each glow plug individually. Replace any with open circuit or high resistance. Check relay/module.

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