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Home / DTC / P0380 — Glow Plug/Heater Circuit A

P0380 — Glow Plug/Heater Circuit A

Detailed page for trouble code P0380.

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Code

P0380

Generic P — Powertrain

Glow Plug/Heater Circuit A

Brand: Generic
Type: P — Powertrain
Views: UK: 19 EN: 80 RU: 62
AI status
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Page language: EN

Causes

  • Open or short in glow plug/heater wiring harness
  • Failed glow plug or heater element
  • Faulty glow plug relay or control module
  • Blown fuse or fusible link for glow/heater circuit
  • Corroded or loose connector(s)
  • Low battery or poor battery connections

Symptoms

  • Extended cranking time or hard cold starts
  • Glow plug warning/diagnostic lamp illuminated
  • Rough idle or misfire after cold start
  • Reduced cold-weather driveability
  • Possible diagnostic trouble lamp (MIL) illumination

What to check

  • Scan for codes and note freeze-frame/conditions when P0380 set
  • Verify battery voltage and charging system (battery >11.5 V with starter off)
  • Inspect glow plug harness, connectors, and relay for corrosion, damage, or loose pins
  • Check fuses/fusible links protecting the glow/heater circuit
  • Measure resistance of each glow plug and compare to specification
  • Verify relay/control module operation and coil/supply voltage with scan tool or multimeter

Signal parameters

  • Control supply voltage to glow/heater rail: approximately battery voltage (~11.5–14.5 V) when activated
  • Glow plug resistance (typical range): ~0.5–3.0 ohms per plug (manufacturer-specific)
  • Current per glow plug: varies by design (commonly several amps up to ~20–30 A total for bank) — check manufacturer spec
  • Relay coil supply: ~12 V when relay energized; coil resistance per spec
  • Expected activation duration: seconds up to 20–30 s during preheat (varies by engine and temperature)

Diagnostic algorithm

  1. Retrieve freeze-frame data and all stored codes; note conditions when fault set (engine temp, battery voltage).
  2. Verify battery condition and supply voltage at key off and during crank; correct any low-voltage issues first.
  3. Visually inspect harness, connectors, and ground points for corrosion, heat damage or loose terminals; repair as needed.
  4. Check fuse(s) and replace any blown protective devices on the glow/heater circuit.
  5. With ignition off, disconnect glow plug connectors and measure each glow plug resistance to ground; compare to spec. Replace any plugs out of spec or open.
  6. With ignition on (and following safety precautions), operate glow circuit with scan tool or by key-on to measure supply voltage at glow rail and relay output. Verify relay coil activation and switching voltage.
  7. Perform current draw test on glow rail using a clamp meter or inline ammeter to confirm expected current and detect open/short conditions.
  8. If wiring or connector faults are suspected, perform continuity and short-to-ground/power tests on the harness back to the ECM/relay.
  9. If component and wiring checks are good, test or substitute the glow relay/control module. If ECM output is suspected, compare signals against manufacturer data before replacing ECM.
  10. After repairs, clear codes and perform a functional test and road test to ensure the fault does not return.

Likely causes

  • One or more failed glow plugs (high resistance or open)
  • Bad relay or control module preventing power to the glow rail
  • Damaged wiring or connector corrosion causing open/short
  • Blown fuse protecting the glow/heater circuit
  • Low system voltage (weak battery, bad ground) causing a false fault

Fault status

⚠️ Status
P0380 — Glow Plug/Heater Circuit A Malfunction. The control module detected an electrical fault (open/short, failed component, or low voltage) in the glow plug/heater circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0381 P0670 P0671 P0672 P0673 P0674
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