Code
P0672
Generic
P — Powertrain
Cylinder 2 Glow Plug Circuit/Open
Views:
UK: 23
EN: 60
RU: 71
AI status
Completed
Completed
100%
Causes
- Failed glow plug (open or internally damaged)
- Broken, corroded or disconnected wiring or connector at cylinder 2 glow plug
- Faulty glow plug relay or heater control module
- Blown fuse protecting the glow plug circuit
- PCM/ECM output driver failure
- Poor ground connection for the glow plug circuit
Symptoms
- Illuminated Check Engine / Malfunction Indicator Lamp
- Hard cold starting or extended cranking time (especially in cold ambient)
- Rough idle or misfire on initial warm-up
- Diagnostic trouble code P0672 stored in ECM
What to check
- Read pending/freeze-frame data with a scan tool and verify P0672 is current
- Check battery voltage (should be ~12.0–14.5 V) and overall charging system health
- Visually inspect glow plug #2 connector and wiring for corrosion, damage, looseness or burns
- Check fuse(s) and glow plug relay for continuity and proper operation
- Measure supply voltage at the glow plug connector with key on and when glow is commanded
- Measure resistance of glow plug #2 with it removed (engine cold) and compare to spec
Signal parameters
- Expected supply voltage at glow plug when commanded: approx. battery voltage (11–14.5 V)
- Typical glow plug resistance (cold) — low ohms: roughly 0.2–3.0 Ω (varies by design); open = infinite/OL
- Current draw per glow plug when energized: typically several amps (5–30 A), varies by design
- No continuity (OL) or very high resistance indicates open circuit/faulty glow plug or wiring
- No voltage at connector when commanded indicates relay, fuse or wiring/PCM issue
Diagnostic algorithm
- Connect a scan tool, confirm P0672 is present and attempt to command the glow system while monitoring live data.
- Verify battery voltage and ensure adequate voltage during tests (low battery can cause false codes).
- Visually inspect glow plug #2 connector, wiring harness, and engine grounds for damage or corrosion; repair as needed.
- With ignition off, disconnect glow plug #2 and measure resistance from plug terminal to body; compare to specification; infinite/very high = bad plug.
- Backprobe the connector at the harness side; with glow commanded, measure voltage at the supply terminal. If battery voltage is present, suspect the glow plug itself or poor ground.
- If no supply voltage when commanded, check related fuse(s) and the glow plug relay/heater control module for operation. Replace or repair as required.
- Swap glow plug #2 with a known-good glow plug from another cylinder. If the code moves to that cylinder, replace the faulty glow plug.
- Check continuity between PCM output and relay/connector; if wiring is good and relay works, suspect PCM driver fault and test further per manufacturer procedures.
- After repairs, clear codes and perform repeat glow command/start cycles to verify the fault does not return.
Likely causes
- Open or high-resistance glow plug in cylinder 2
- Damaged or disconnected wiring/connectors to glow plug #2
- Faulty relay/heater control not supplying voltage to cylinder 2
- Blown fuse in glow/relay circuit
- Control module (ECM) driver fault (less common)
Fault status
Status
Open circuit detected in glow plug circuit for cylinder 2 — ECM did not detect expected voltage/current when commanding the heater.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P0672
LAND ROVER
P — Powertrain
Cylinder 2 glow plug open circuit
Views:
UK: 6
EN: 39
RU: 39
AI status
Completed
Completed
100%
Causes
- Failed glow plug (open or internally damaged)
- Broken, corroded or disconnected wiring or connector at cylinder 2 glow plug
- Faulty glow plug relay or heater control module
- Blown fuse protecting the glow plug circuit
- PCM/ECM output driver failure
- Poor ground connection for the glow plug circuit
Symptoms
- Illuminated Check Engine / Malfunction Indicator Lamp
- Hard cold starting or extended cranking time (especially in cold ambient)
- Rough idle or misfire on initial warm-up
- Diagnostic trouble code P0672 stored in ECM
What to check
- Read pending/freeze-frame data with a scan tool and verify P0672 is current
- Check battery voltage (should be ~12.0–14.5 V) and overall charging system health
- Visually inspect glow plug #2 connector and wiring for corrosion, damage, looseness or burns
- Check fuse(s) and glow plug relay for continuity and proper operation
- Measure supply voltage at the glow plug connector with key on and when glow is commanded
- Measure resistance of glow plug #2 with it removed (engine cold) and compare to spec
Signal parameters
- Expected supply voltage at glow plug when commanded: approx. battery voltage (11–14.5 V)
- Typical glow plug resistance (cold) — low ohms: roughly 0.2–3.0 Ω (varies by design); open = infinite/OL
- Current draw per glow plug when energized: typically several amps (5–30 A), varies by design
- No continuity (OL) or very high resistance indicates open circuit/faulty glow plug or wiring
- No voltage at connector when commanded indicates relay, fuse or wiring/PCM issue
Diagnostic algorithm
- Connect a scan tool, confirm P0672 is present and attempt to command the glow system while monitoring live data.
- Verify battery voltage and ensure adequate voltage during tests (low battery can cause false codes).
- Visually inspect glow plug #2 connector, wiring harness, and engine grounds for damage or corrosion; repair as needed.
- With ignition off, disconnect glow plug #2 and measure resistance from plug terminal to body; compare to specification; infinite/very high = bad plug.
- Backprobe the connector at the harness side; with glow commanded, measure voltage at the supply terminal. If battery voltage is present, suspect the glow plug itself or poor ground.
- If no supply voltage when commanded, check related fuse(s) and the glow plug relay/heater control module for operation. Replace or repair as required.
- Swap glow plug #2 with a known-good glow plug from another cylinder. If the code moves to that cylinder, replace the faulty glow plug.
- Check continuity between PCM output and relay/connector; if wiring is good and relay works, suspect PCM driver fault and test further per manufacturer procedures.
- After repairs, clear codes and perform repeat glow command/start cycles to verify the fault does not return.
Likely causes
- Open or high-resistance glow plug in cylinder 2
- Damaged or disconnected wiring/connectors to glow plug #2
- Faulty relay/heater control not supplying voltage to cylinder 2
- Blown fuse in glow/relay circuit
- Control module (ECM) driver fault (less common)
Fault status
Status
Open circuit detected in glow plug circuit for cylinder 2 — ECM did not detect expected voltage/current when commanding the heater.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
