Code
P0382
Generic
P — Powertrain
Glow Plug/Heater Circuit B
Views:
UK: 12
EN: 20
RU: 12
AI status
Completed
Completed
100%
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
- Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
- Inspect battery condition and charging; weak battery can affect glow operation and readings.
- Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
- With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
- Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
- 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.
- Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
- Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
- 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.
- 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
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Code
P0382
GWM
P — Powertrain
- Malfunction in the exhaust gas recirculation system
Views:
UK: 1
EN: 3
RU: 1
AI status
Completed
Completed
100%
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
- Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
- Inspect battery condition and charging; weak battery can affect glow operation and readings.
- Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
- With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
- Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
- 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.
- Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
- Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
- 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.
- 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
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Code
P0382
HUMMER
P — Powertrain
Exhaust Gas Recirculation Flow Malfunction
Views:
UK: 4
EN: 8
RU: 6
AI status
Completed
Completed
100%
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
- Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
- Inspect battery condition and charging; weak battery can affect glow operation and readings.
- Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
- With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
- Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
- 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.
- Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
- Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
- 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.
- 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
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Code
P0382
LAND ROVER
P — Powertrain
Glow plug / heater circuit B
Views:
UK: 3
EN: 6
RU: 2
AI status
Completed
Completed
100%
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
- Retrieve code data and freeze frame. Confirm P0382 and check for additional related codes.
- Inspect battery condition and charging; weak battery can affect glow operation and readings.
- Visually inspect fuses, relays and wiring harness for circuit B. Repair any obvious damage.
- With the key on and glow system commanded, check for supply voltage at the glow rail and at each plug connector.
- Measure resistance of each glow plug in circuit B (engine cold) and compare to spec; replace any out-of-spec plugs.
- 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.
- Check continuity and resistance of wiring from relay/fuse to glow plugs and to ground. Repair breaks or high-resistance joints.
- Test or substitute the glow plug relay/driver module. If relay/driver does not switch or drive correctly, replace.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email