Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P0382 — Glow Plug/Heater Circuit B

P0382 — Glow Plug/Heater Circuit B

Detailed page for trouble code P0382.

33,912codes
59brands
11,451generic
22,461specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P0382

Generic P — Powertrain

Glow Plug/Heater Circuit B

Brand: Generic
Type: P — Powertrain
Views: UK: 27 EN: 49 RU: 37
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for glow plug/heater circuit
  • Faulty glow plug(s) or heater element(s)
  • Failed glow plug relay or driver module
  • Open or shorted wiring harness or damaged connector
  • Poor or missing ground connection
  • High resistance in wiring or plug harness

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard cold starting or extended cranking time
  • Rough idle or misfire on cold start
  • Increased white/gray exhaust smoke during warm-up (diesels)
  • Reduced engine performance during cold conditions

What to check

  • Read freeze frame and pending codes with a scan tool; note engine temp and battery voltage
  • Inspect fuses and relays related to glow plug/heater circuit 'B'
  • Visually inspect wiring, connectors, and grounds for corrosion, damage or loose pins
  • Measure voltage at glow-plug/heater connector with key on and during glow cycle
  • Measure individual glow plug/heater resistances and compare to spec
  • Check current draw of the glow plug group using an appropriate ammeter or clamp meter

Signal parameters

  • Battery voltage at glow plug supply when active: ~11–14.5 V (should follow battery)
  • Glow plug/heater resistance per element: typically low (example range 0.5–3 Ω) — check vehicle spec
  • Current draw per glow plug/heater: several amps (varies by type); total group draw often tens of amps
  • Control signal from ECM: switched supply or ground; should change state during preheat
  • Any significant voltage drop between battery and glow rail (>1 V) indicates wiring/fuse/connector issue

Diagnostic algorithm

  1. Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
  2. Inspect battery condition and charging; weak battery can affect glow operation and readings.
  3. Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
  4. With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
  5. Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
  6. Measure current draw of the entire glow plug bank B while energized. Compare to expected total draw; a low/no draw suggests open circuit, excessive draw suggests short/failed plug.
  7. Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
  8. Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
  9. If wiring and components check good, use a lab scope or DVOM to monitor ECM output/command and verify correct switching behavior. If ECM output is absent or erratic, consider ECM fault after confirming wiring and load.
  10. Clear codes and perform a cold cranking test cycle to confirm repair. Re-scan for reappearance of P0382.

Likely causes

  • Corroded or loose connector at glow plug rail
  • One or more failed glow plugs in circuit B causing abnormal current draw
  • Failed glow plug relay or control module not switching properly
  • Blown fuse protecting the heater circuit
  • Wire insulation damaged and shorting to ground or another circuit

Fault status

⚠️ Status
MIL on. ECM detected abnormal condition in Glow Plug/Heater Circuit B (open/short/high resistance or incorrect current). Freeze-frame may show low battery/engine temp at time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

P0380 P0381 P0383 P0670 P0671
6,468

The library contains 6,468 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

AUDI
1,160
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
LAND ROVER
320
LEXUS
1
LINCOLN
166
MERCEDES-BENZ
610
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,042
TRIUMPH
131
VOLKSWAGEN
139
VOLVO
100
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0382

GWM P — Powertrain

- Malfunction in the exhaust gas recirculation system

Brand: GWM
Type: P — Powertrain
Views: UK: 25 EN: 29 RU: 32
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for glow plug/heater circuit
  • Faulty glow plug(s) or heater element(s)
  • Failed glow plug relay or driver module
  • Open or shorted wiring harness or damaged connector
  • Poor or missing ground connection
  • High resistance in wiring or plug harness

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard cold starting or extended cranking time
  • Rough idle or misfire on cold start
  • Increased white/gray exhaust smoke during warm-up (diesels)
  • Reduced engine performance during cold conditions

What to check

  • Read freeze frame and pending codes with a scan tool; note engine temp and battery voltage
  • Inspect fuses and relays related to glow plug/heater circuit 'B'
  • Visually inspect wiring, connectors, and grounds for corrosion, damage or loose pins
  • Measure voltage at glow-plug/heater connector with key on and during glow cycle
  • Measure individual glow plug/heater resistances and compare to spec
  • Check current draw of the glow plug group using an appropriate ammeter or clamp meter

Signal parameters

  • Battery voltage at glow plug supply when active: ~11–14.5 V (should follow battery)
  • Glow plug/heater resistance per element: typically low (example range 0.5–3 Ω) — check vehicle spec
  • Current draw per glow plug/heater: several amps (varies by type); total group draw often tens of amps
  • Control signal from ECM: switched supply or ground; should change state during preheat
  • Any significant voltage drop between battery and glow rail (>1 V) indicates wiring/fuse/connector issue

Diagnostic algorithm

  1. Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
  2. Inspect battery condition and charging; weak battery can affect glow operation and readings.
  3. Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
  4. With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
  5. Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
  6. Measure current draw of the entire glow plug bank B while energized. Compare to expected total draw; a low/no draw suggests open circuit, excessive draw suggests short/failed plug.
  7. Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
  8. Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
  9. If wiring and components check good, use a lab scope or DVOM to monitor ECM output/command and verify correct switching behavior. If ECM output is absent or erratic, consider ECM fault after confirming wiring and load.
  10. Clear codes and perform a cold cranking test cycle to confirm repair. Re-scan for reappearance of P0382.

Likely causes

  • Corroded or loose connector at glow plug rail
  • One or more failed glow plugs in circuit B causing abnormal current draw
  • Failed glow plug relay or control module not switching properly
  • Blown fuse protecting the heater circuit
  • Wire insulation damaged and shorting to ground or another circuit

Fault status

⚠️ Status
MIL on. ECM detected abnormal condition in Glow Plug/Heater Circuit B (open/short/high resistance or incorrect current). Freeze-frame may show low battery/engine temp at time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

P0380 P0381 P0383 P0670 P0671
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0382

HUMMER P — Powertrain

Exhaust Gas Recirculation Flow Malfunction

Brand: HUMMER
Type: P — Powertrain
Views: UK: 23 EN: 33 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for glow plug/heater circuit
  • Faulty glow plug(s) or heater element(s)
  • Failed glow plug relay or driver module
  • Open or shorted wiring harness or damaged connector
  • Poor or missing ground connection
  • High resistance in wiring or plug harness

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard cold starting or extended cranking time
  • Rough idle or misfire on cold start
  • Increased white/gray exhaust smoke during warm-up (diesels)
  • Reduced engine performance during cold conditions

What to check

  • Read freeze frame and pending codes with a scan tool; note engine temp and battery voltage
  • Inspect fuses and relays related to glow plug/heater circuit 'B'
  • Visually inspect wiring, connectors, and grounds for corrosion, damage or loose pins
  • Measure voltage at glow-plug/heater connector with key on and during glow cycle
  • Measure individual glow plug/heater resistances and compare to spec
  • Check current draw of the glow plug group using an appropriate ammeter or clamp meter

Signal parameters

  • Battery voltage at glow plug supply when active: ~11–14.5 V (should follow battery)
  • Glow plug/heater resistance per element: typically low (example range 0.5–3 Ω) — check vehicle spec
  • Current draw per glow plug/heater: several amps (varies by type); total group draw often tens of amps
  • Control signal from ECM: switched supply or ground; should change state during preheat
  • Any significant voltage drop between battery and glow rail (>1 V) indicates wiring/fuse/connector issue

Diagnostic algorithm

  1. Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
  2. Inspect battery condition and charging; weak battery can affect glow operation and readings.
  3. Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
  4. With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
  5. Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
  6. Measure current draw of the entire glow plug bank B while energized. Compare to expected total draw; a low/no draw suggests open circuit, excessive draw suggests short/failed plug.
  7. Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
  8. Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
  9. If wiring and components check good, use a lab scope or DVOM to monitor ECM output/command and verify correct switching behavior. If ECM output is absent or erratic, consider ECM fault after confirming wiring and load.
  10. Clear codes and perform a cold cranking test cycle to confirm repair. Re-scan for reappearance of P0382.

Likely causes

  • Corroded or loose connector at glow plug rail
  • One or more failed glow plugs in circuit B causing abnormal current draw
  • Failed glow plug relay or control module not switching properly
  • Blown fuse protecting the heater circuit
  • Wire insulation damaged and shorting to ground or another circuit

Fault status

⚠️ Status
MIL on. ECM detected abnormal condition in Glow Plug/Heater Circuit B (open/short/high resistance or incorrect current). Freeze-frame may show low battery/engine temp at time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

P0380 P0381 P0383 P0670 P0671
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0382

LAND ROVER P — Powertrain

Glow plug / heater circuit B

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 24 EN: 28 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse for glow plug/heater circuit
  • Faulty glow plug(s) or heater element(s)
  • Failed glow plug relay or driver module
  • Open or shorted wiring harness or damaged connector
  • Poor or missing ground connection
  • High resistance in wiring or plug harness

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard cold starting or extended cranking time
  • Rough idle or misfire on cold start
  • Increased white/gray exhaust smoke during warm-up (diesels)
  • Reduced engine performance during cold conditions

What to check

  • Read freeze frame and pending codes with a scan tool; note engine temp and battery voltage
  • Inspect fuses and relays related to glow plug/heater circuit 'B'
  • Visually inspect wiring, connectors, and grounds for corrosion, damage or loose pins
  • Measure voltage at glow-plug/heater connector with key on and during glow cycle
  • Measure individual glow plug/heater resistances and compare to spec
  • Check current draw of the glow plug group using an appropriate ammeter or clamp meter

Signal parameters

  • Battery voltage at glow plug supply when active: ~11–14.5 V (should follow battery)
  • Glow plug/heater resistance per element: typically low (example range 0.5–3 Ω) — check vehicle spec
  • Current draw per glow plug/heater: several amps (varies by type); total group draw often tens of amps
  • Control signal from ECM: switched supply or ground; should change state during preheat
  • Any significant voltage drop between battery and glow rail (>1 V) indicates wiring/fuse/connector issue

Diagnostic algorithm

  1. Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
  2. Inspect battery condition and charging; weak battery can affect glow operation and readings.
  3. Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
  4. With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
  5. Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
  6. Measure current draw of the entire glow plug bank B while energized. Compare to expected total draw; a low/no draw suggests open circuit, excessive draw suggests short/failed plug.
  7. Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
  8. Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
  9. If wiring and components check good, use a lab scope or DVOM to monitor ECM output/command and verify correct switching behavior. If ECM output is absent or erratic, consider ECM fault after confirming wiring and load.
  10. Clear codes and perform a cold cranking test cycle to confirm repair. Re-scan for reappearance of P0382.

Likely causes

  • Corroded or loose connector at glow plug rail
  • One or more failed glow plugs in circuit B causing abnormal current draw
  • Failed glow plug relay or control module not switching properly
  • Blown fuse protecting the heater circuit
  • Wire insulation damaged and shorting to ground or another circuit

Fault status

⚠️ Status
MIL on. ECM detected abnormal condition in Glow Plug/Heater Circuit B (open/short/high resistance or incorrect current). Freeze-frame may show low battery/engine temp at time of fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

P0380 P0381 P0383 P0670 P0671
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .