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Home / DTC / B1334 — Tailgate open circuit

B1334 — Tailgate open circuit

Detailed page for trouble code B1334.

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Code

B1334

ALFA ROMEO B — Body

Tailgate open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 3 EN: 5 RU: 2
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring between tailgate latch/sensor and BCM
  • Corroded or loose connector at tailgate latch or hinge
  • Failed tailgate latch microswitch or position sensor
  • Blown fuse or poor power/ground to the sensor circuit
  • Water ingress or physical damage at tailgate wiring harness (hinge area)
  • Aftermarket alarm/remote install damaging or interrupting the circuit

Symptoms

  • Tailgate-open warning lamp or message shown on dash
  • Interior or tailgate courtesy lights staying on
  • Tailgate does not lock or central locking does not operate the tailgate
  • Possible battery drain with tailgate circuit staying open
  • Diagnostic trouble code B1334 stored in BCM
  • Intermittent behavior when closing/opening tailgate (may pass on jiggle)

What to check

  • Scan vehicle for stored codes and live tailgate sensor data with a diagnostic tool
  • Visually inspect tailgate latch, sensor, connectors and wiring (especially through hinge grommet)
  • Check for corrosion, bent pins, or water intrusion at connectors
  • Verify relevant fuses and shared power/ground circuits
  • Operate tailgate while watching live input; perform wiggle test on harness
  • Measure supply voltage and ground at the latch connector with multimeter

Signal parameters

  • Sensor supply: approximately battery voltage when ignition on (typically ~11–14 V) at the power feed to the sensor
  • Closed/latched state: sensor input at BCM typically pulled to ground or near 0 V (or shows low resistance to ground)
  • Open/unlatched state: sensor input typically shows battery voltage or high impedance (open circuit/infinite Ω)
  • If equipped with a digital/switch signal, expect a clear change between logical low and high on the BCM input — use an oscilloscope or scan tool for intermittent traces
  • Normal latch resistance (closed): low ohms; open: very high/OL — refer to service manual for exact values

Diagnostic algorithm

  1. Connect a scan tool, read and record freeze frame and live tailgate sensor input while operating tailgate.
  2. Visually inspect tailgate latch assembly, harness grommet in hinge, and connectors for damage, corrosion, or water.
  3. Check fuses related to body/BCM circuits. Replace if blown and retest; note if fuse blows again.
  4. With ignition on, back-probe the latch connector: verify supply voltage, signal voltage, and ground reference while opening/closing the tailgate.
  5. Perform a continuity check between the latch sensor signal pin and the BCM input pin. Inspect for short to ground or battery where present.
  6. Wiggle the harness through the full range of motion while monitoring the signal to reproduce intermittent open-circuit behavior.
  7. If open circuit in wiring is found, repair broken conductor or replace damaged section of harness (pay attention to grommet through hinge).
  8. If wiring and connectors are good but sensor stays open, replace the tailgate latch/sensor assembly and retest.
  9. If new latch and harness tested good and code persists, inspect BCM connector and grounds; consider BCM input fault and follow manufacturer procedures for module diagnosis or replacement.
  10. Clear codes and verify proper operation over several open/close cycles and a road test if required. Confirm no recurring codes.

Likely causes

  • Wire fatigue or broken conductor in harness through tailgate hinge
  • Connector pins corroded or pushed out at latch connector
  • Latch sensor mechanically failed/stuck (worn microswitch)
  • Open ground or fused feed to sensor due to corrosion or broken wire
  • Previous body work or trunk/taillight replacement disturbed the harness

Fault status

⚠️ Status
B1334 — Tailgate open circuit: the body control module detects no valid signal from the tailgate/latch position sensor (open or missing circuit). Inspect wiring, connectors, latch sensor, fuses and BCM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1324 B1335 B1799 B1340
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Code

B1334

FIAT B — Body

Tailgate open circuit

Brand: FIAT
Type: B — Body
Views: UK: 3 EN: 5 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring between tailgate latch/sensor and BCM
  • Corroded or loose connector at tailgate latch or hinge
  • Failed tailgate latch microswitch or position sensor
  • Blown fuse or poor power/ground to the sensor circuit
  • Water ingress or physical damage at tailgate wiring harness (hinge area)
  • Aftermarket alarm/remote install damaging or interrupting the circuit

Symptoms

  • Tailgate-open warning lamp or message shown on dash
  • Interior or tailgate courtesy lights staying on
  • Tailgate does not lock or central locking does not operate the tailgate
  • Possible battery drain with tailgate circuit staying open
  • Diagnostic trouble code B1334 stored in BCM
  • Intermittent behavior when closing/opening tailgate (may pass on jiggle)

What to check

  • Scan vehicle for stored codes and live tailgate sensor data with a diagnostic tool
  • Visually inspect tailgate latch, sensor, connectors and wiring (especially through hinge grommet)
  • Check for corrosion, bent pins, or water intrusion at connectors
  • Verify relevant fuses and shared power/ground circuits
  • Operate tailgate while watching live input; perform wiggle test on harness
  • Measure supply voltage and ground at the latch connector with multimeter

Signal parameters

  • Sensor supply: approximately battery voltage when ignition on (typically ~11–14 V) at the power feed to the sensor
  • Closed/latched state: sensor input at BCM typically pulled to ground or near 0 V (or shows low resistance to ground)
  • Open/unlatched state: sensor input typically shows battery voltage or high impedance (open circuit/infinite Ω)
  • If equipped with a digital/switch signal, expect a clear change between logical low and high on the BCM input — use an oscilloscope or scan tool for intermittent traces
  • Normal latch resistance (closed): low ohms; open: very high/OL — refer to service manual for exact values

Diagnostic algorithm

  1. Connect a scan tool, read and record freeze frame and live tailgate sensor input while operating tailgate.
  2. Visually inspect tailgate latch assembly, harness grommet in hinge, and connectors for damage, corrosion, or water.
  3. Check fuses related to body/BCM circuits. Replace if blown and retest; note if fuse blows again.
  4. With ignition on, back-probe the latch connector: verify supply voltage, signal voltage, and ground reference while opening/closing the tailgate.
  5. Perform a continuity check between the latch sensor signal pin and the BCM input pin. Inspect for short to ground or battery where present.
  6. Wiggle the harness through the full range of motion while monitoring the signal to reproduce intermittent open-circuit behavior.
  7. If open circuit in wiring is found, repair broken conductor or replace damaged section of harness (pay attention to grommet through hinge).
  8. If wiring and connectors are good but sensor stays open, replace the tailgate latch/sensor assembly and retest.
  9. If new latch and harness tested good and code persists, inspect BCM connector and grounds; consider BCM input fault and follow manufacturer procedures for module diagnosis or replacement.
  10. Clear codes and verify proper operation over several open/close cycles and a road test if required. Confirm no recurring codes.

Likely causes

  • Wire fatigue or broken conductor in harness through tailgate hinge
  • Connector pins corroded or pushed out at latch connector
  • Latch sensor mechanically failed/stuck (worn microswitch)
  • Open ground or fused feed to sensor due to corrosion or broken wire
  • Previous body work or trunk/taillight replacement disturbed the harness

Fault status

⚠️ Status
B1334 — Tailgate open circuit: the body control module detects no valid signal from the tailgate/latch position sensor (open or missing circuit). Inspect wiring, connectors, latch sensor, fuses and BCM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1324 B1335 B1799 B1340
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Code

B1334

LAND ROVER B — Body

rear right door ajar - circuit failure

Brand: LAND ROVER
Type: B — Body
Views: UK: 4 EN: 8 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring between tailgate latch/sensor and BCM
  • Corroded or loose connector at tailgate latch or hinge
  • Failed tailgate latch microswitch or position sensor
  • Blown fuse or poor power/ground to the sensor circuit
  • Water ingress or physical damage at tailgate wiring harness (hinge area)
  • Aftermarket alarm/remote install damaging or interrupting the circuit

Symptoms

  • Tailgate-open warning lamp or message shown on dash
  • Interior or tailgate courtesy lights staying on
  • Tailgate does not lock or central locking does not operate the tailgate
  • Possible battery drain with tailgate circuit staying open
  • Diagnostic trouble code B1334 stored in BCM
  • Intermittent behavior when closing/opening tailgate (may pass on jiggle)

What to check

  • Scan vehicle for stored codes and live tailgate sensor data with a diagnostic tool
  • Visually inspect tailgate latch, sensor, connectors and wiring (especially through hinge grommet)
  • Check for corrosion, bent pins, or water intrusion at connectors
  • Verify relevant fuses and shared power/ground circuits
  • Operate tailgate while watching live input; perform wiggle test on harness
  • Measure supply voltage and ground at the latch connector with multimeter

Signal parameters

  • Sensor supply: approximately battery voltage when ignition on (typically ~11–14 V) at the power feed to the sensor
  • Closed/latched state: sensor input at BCM typically pulled to ground or near 0 V (or shows low resistance to ground)
  • Open/unlatched state: sensor input typically shows battery voltage or high impedance (open circuit/infinite Ω)
  • If equipped with a digital/switch signal, expect a clear change between logical low and high on the BCM input — use an oscilloscope or scan tool for intermittent traces
  • Normal latch resistance (closed): low ohms; open: very high/OL — refer to service manual for exact values

Diagnostic algorithm

  1. Connect a scan tool, read and record freeze frame and live tailgate sensor input while operating tailgate.
  2. Visually inspect tailgate latch assembly, harness grommet in hinge, and connectors for damage, corrosion, or water.
  3. Check fuses related to body/BCM circuits. Replace if blown and retest; note if fuse blows again.
  4. With ignition on, back-probe the latch connector: verify supply voltage, signal voltage, and ground reference while opening/closing the tailgate.
  5. Perform a continuity check between the latch sensor signal pin and the BCM input pin. Inspect for short to ground or battery where present.
  6. Wiggle the harness through the full range of motion while monitoring the signal to reproduce intermittent open-circuit behavior.
  7. If open circuit in wiring is found, repair broken conductor or replace damaged section of harness (pay attention to grommet through hinge).
  8. If wiring and connectors are good but sensor stays open, replace the tailgate latch/sensor assembly and retest.
  9. If new latch and harness tested good and code persists, inspect BCM connector and grounds; consider BCM input fault and follow manufacturer procedures for module diagnosis or replacement.
  10. Clear codes and verify proper operation over several open/close cycles and a road test if required. Confirm no recurring codes.

Likely causes

  • Wire fatigue or broken conductor in harness through tailgate hinge
  • Connector pins corroded or pushed out at latch connector
  • Latch sensor mechanically failed/stuck (worn microswitch)
  • Open ground or fused feed to sensor due to corrosion or broken wire
  • Previous body work or trunk/taillight replacement disturbed the harness

Fault status

⚠️ Status
B1334 — Tailgate open circuit: the body control module detects no valid signal from the tailgate/latch position sensor (open or missing circuit). Inspect wiring, connectors, latch sensor, fuses and BCM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1324 B1335 B1799 B1340
Workshop Manuals

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Download
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Code

B1334

Other B — Body

Decklid Ajar Rear Door Circuit Short To Ground

Brand: Other
Type: B — Body
Views: UK: 18 EN: 31 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or disconnected wiring between tailgate latch/sensor and BCM
  • Corroded or loose connector at tailgate latch or hinge
  • Failed tailgate latch microswitch or position sensor
  • Blown fuse or poor power/ground to the sensor circuit
  • Water ingress or physical damage at tailgate wiring harness (hinge area)
  • Aftermarket alarm/remote install damaging or interrupting the circuit

Symptoms

  • Tailgate-open warning lamp or message shown on dash
  • Interior or tailgate courtesy lights staying on
  • Tailgate does not lock or central locking does not operate the tailgate
  • Possible battery drain with tailgate circuit staying open
  • Diagnostic trouble code B1334 stored in BCM
  • Intermittent behavior when closing/opening tailgate (may pass on jiggle)

What to check

  • Scan vehicle for stored codes and live tailgate sensor data with a diagnostic tool
  • Visually inspect tailgate latch, sensor, connectors and wiring (especially through hinge grommet)
  • Check for corrosion, bent pins, or water intrusion at connectors
  • Verify relevant fuses and shared power/ground circuits
  • Operate tailgate while watching live input; perform wiggle test on harness
  • Measure supply voltage and ground at the latch connector with multimeter

Signal parameters

  • Sensor supply: approximately battery voltage when ignition on (typically ~11–14 V) at the power feed to the sensor
  • Closed/latched state: sensor input at BCM typically pulled to ground or near 0 V (or shows low resistance to ground)
  • Open/unlatched state: sensor input typically shows battery voltage or high impedance (open circuit/infinite Ω)
  • If equipped with a digital/switch signal, expect a clear change between logical low and high on the BCM input — use an oscilloscope or scan tool for intermittent traces
  • Normal latch resistance (closed): low ohms; open: very high/OL — refer to service manual for exact values

Diagnostic algorithm

  1. Connect a scan tool, read and record freeze frame and live tailgate sensor input while operating tailgate.
  2. Visually inspect tailgate latch assembly, harness grommet in hinge, and connectors for damage, corrosion, or water.
  3. Check fuses related to body/BCM circuits. Replace if blown and retest; note if fuse blows again.
  4. With ignition on, back-probe the latch connector: verify supply voltage, signal voltage, and ground reference while opening/closing the tailgate.
  5. Perform a continuity check between the latch sensor signal pin and the BCM input pin. Inspect for short to ground or battery where present.
  6. Wiggle the harness through the full range of motion while monitoring the signal to reproduce intermittent open-circuit behavior.
  7. If open circuit in wiring is found, repair broken conductor or replace damaged section of harness (pay attention to grommet through hinge).
  8. If wiring and connectors are good but sensor stays open, replace the tailgate latch/sensor assembly and retest.
  9. If new latch and harness tested good and code persists, inspect BCM connector and grounds; consider BCM input fault and follow manufacturer procedures for module diagnosis or replacement.
  10. Clear codes and verify proper operation over several open/close cycles and a road test if required. Confirm no recurring codes.

Likely causes

  • Wire fatigue or broken conductor in harness through tailgate hinge
  • Connector pins corroded or pushed out at latch connector
  • Latch sensor mechanically failed/stuck (worn microswitch)
  • Open ground or fused feed to sensor due to corrosion or broken wire
  • Previous body work or trunk/taillight replacement disturbed the harness

Fault status

⚠️ Status
B1334 — Tailgate open circuit: the body control module detects no valid signal from the tailgate/latch position sensor (open or missing circuit). Inspect wiring, connectors, latch sensor, fuses and BCM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1320 B1324 B1335 B1799 B1340
Workshop Manuals

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  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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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.

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
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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.

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
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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.

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
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