Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P0673 — Cylinder 3 glow plug open circuit

P0673 — Cylinder 3 glow plug open circuit

Detailed page for trouble code P0673.

33,033codes
59brands
10,572generic
22,461specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P0673

LAND ROVER P — Powertrain

Cylinder 3 glow plug open circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 3 EN: 12 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed glow plug (open winding)
  • Broken or disconnected wiring to glow plug #3
  • Corroded or damaged connector/terminal
  • Blown fuse or faulty glow relay/power supply
  • Open or high-resistance ground connection
  • Faulty ECM/driver circuit (rare)

Symptoms

  • Glow plug warning lamp or diesel preheat indicator illuminated
  • Hard starting or extended cranking when cold
  • Excessive white smoke on cold start
  • Rough idle or misfire until engine warms
  • Check Engine Light (MIL) set with stored code P0673

What to check

  • Read freeze-frame and live data with a diagnostic scanner (confirm code and conditions)
  • Visually inspect glow plug #3 connector, wiring, and insulation for damage/corrosion
  • Check glow plug fuse(s) and glow relay/power supply for continuity and operation
  • Measure resistance of glow plug #3 (engine cold) by removing connector — compare to manufacturer spec
  • Backprobe connector with ignition on to verify supply voltage and driver signal from ECM when preheat is active
  • Perform wiggle test on harness while monitoring ECU data to detect intermittent opens

Signal parameters

  • Typical glow plug resistance (cold): roughly 0.5–2.0 ohms (varies by engine; check OEM spec)
  • Supply voltage at connector when energized: near battery voltage (~11–14 V) at feed side
  • Driver output: ECM switches ground or positive to allow current flow; expected measurable current draw per plug commonly several amps (varies by design)
  • Open circuit condition: infinite or very high resistance on ohmmeter and/or no current/voltage at plug when commanded

Diagnostic algorithm

  1. Safety first: allow engine to cool, park on level ground, set parking brake. Wear eye protection and insulated gloves when working near battery and heated components.
  2. Use a scan tool: record freeze-frame, note conditions (battery voltage, coolant temp, ambient temp). Clear code only after repairs for retest.
  3. Visual inspection: examine glow plug #3, connector, wiring, and ground paths for damage, corrosion, loose pins, or signs of overheating.
  4. Check fuses/relay: verify supply fuse and glow relay operation. Replace if faulty.
  5. Measure glow plug resistance: disconnect connector and measure resistance of glow plug #3 to engine ground or across the plug — compare to spec. An open (OL) indicates a failed plug.
  6. Verify supply and switching: with harness connected, backprobe feed and driver terminals. With preheat commanded, feed should have battery voltage and driver should show switching (ground or voltage change). No feed indicates power supply/fuse/relay issue; feed present but no switching indicates ECM/driver or open in wiring to plug.
  7. Continuity test: check continuity from ECM/relay to the glow plug connector and from plug connector to engine ground. Repair any open or high-resistance wiring or poor grounds.
  8. Swap test: when safe and plugs are identical, swap plug #3 with another cylinder. If code moves to that cylinder number, plug is faulty. If code remains P0673, suspect wiring/ECM.
  9. Repair/replace: replace failed glow plug and/or repair wiring/connector or replace fuse/relay. If ECM driver is suspected after ruling out wiring and plug, consult dealer-level information before ECM replacement.
  10. Verify: clear codes, perform crank/idle and preheat cycles under similar conditions, confirm code does not return.
  11. Note: consult Land Rover OEM specs and procedures for torque values, plug type, and exact resistance/voltage values.

Likely causes

  • Glow plug #3 has failed open
  • Loose/broken lead or pin at the glow plug connector
  • Corroded connector or terminal causing open circuit
  • Faulty fuse or relay in glow plug feed
  • Damage to harness (chafing, heat, rodent bite) between ECM and cylinder 3

Fault status

⚠️ Status
Cylinder 3 glow plug open circuit — ECM detected an open or very high resistance condition in the glow plug/heater circuit for cylinder 3.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0670 P0671 P0672 P0674 P0675 P0385
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1

LAND ROVER 2015 Discovery Sport HSE

HTML Manual
Discovery Sport HSE Years: 2015 Manual in English Sections: 61,541 AI chunks: 61,541
Short description
LAND ROVER · Discovery Sport HSE · 2015
Open manual
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Buy

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Buy
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 .