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Home / DTC / B2955 — Driver Door Module Communication Fault

B2955 — Driver Door Module Communication Fault

Detailed page for trouble code B2955.

34,405codes
59brands
11,914generic
22,491specific
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Code

B2955

HUMMER B — Body

Driver Door Module Communication Fault

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or intermittent connector at the driver door module
  • Damaged or frayed wiring in the door harness (hinge/jamb flex area)
  • Corrosion or water intrusion in connectors or module
  • Blown fuse or lost module power/ground
  • Failed Driver Door Module
  • Body Control Module (BCM) or gateway module network fault

Symptoms

  • Driver door features inoperative or intermittent (power window, lock, mirror, puddle lamp)
  • Door-related warning messages or chimes
  • Central locking does not respond for driver door only
  • Scan tool shows no response or communication errors from DDM
  • Intermittent faults that change when door is opened/closed or wiring is moved

What to check

  • Read stored and pending codes with a capable scan tool; note freeze-frame and related U-codes
  • Visually inspect driver door module connector and door-jamb harness for corrosion, pin damage, or water intrusion
  • Check fuses and relay(s) related to driver door module power
  • Verify battery voltage and good chassis/engine ground
  • Backprobe DDM power and ground pins for stable voltage while operating door functions
  • Inspect CAN/LIN wiring continuity and insulation, especially at the hinge flex area

Signal parameters

  • DDM module supply voltage (key on and while operating functions)
  • DDM ground continuity and voltage drop under load
  • CAN High and CAN Low idle voltages (typical ~2.5 V each) and differential activity
  • LIN bus idle voltage and message activity (if DDM uses LIN)
  • Presence and frequency of expected DDM message IDs on the network
  • Error counters or message timeouts reported by BCM or gateway

Diagnostic algorithm

  1. Connect a capable scan tool and retrieve all B- and U-codes; record freeze frame and related network codes.
  2. Verify vehicle battery is charged and stable. Clear codes and see if the DDM fault returns to confirm persistent vs. temporary.
  3. Inspect the DDM connector, door hinge harness and jamb for damage, corrosion, or water ingress. Repair any visible issues.
  4. Check fuses and power/ground at the DDM connector. Backprobe the power pin with key on; verify good ground and correct supply voltage.
  5. Monitor CAN/LIN bus with a scope or scan tool. Verify idle voltages and that DDM message IDs appear. Look for bus errors, dominant states, or missing messages.
  6. Wiggle test the door harness and operate door functions while monitoring communication — look for intermittent failures tied to movement.
  7. If wiring and connectors are good, try swapping or reprogramming the DDM per manufacturer service procedures (or connect to dealer-level tool).
  8. If a replacement module is installed, follow proper module programming and security procedures. After repair, clear codes and verify system operation over multiple open/close cycles.
  9. If communication faults persist, investigate upstream modules (BCM/gateway) and the main network harness for faults; consult factory wiring diagrams and technical service bulletins.

Likely causes

  • Poor connector contact or corrosion at DDM connector or door jamb
  • Wiring break or chafe in the door harness at the hinge flex point
  • Loss of power or ground to the DDM (blown fuse, poor ground)
  • Failed DDM
  • Network bus fault (CAN/LIN) or BCM/gateway communication issue

Fault status

⚠️ Status
Driver Door Module communication fault detected — module not responding or messages missing/corrupted on the vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2956 U0073 U0100 U0140 U0164
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

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Code

B2955

HYUNDAI B — Body

No Response NM Message (Cluster)

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or intermittent connector at the driver door module
  • Damaged or frayed wiring in the door harness (hinge/jamb flex area)
  • Corrosion or water intrusion in connectors or module
  • Blown fuse or lost module power/ground
  • Failed Driver Door Module
  • Body Control Module (BCM) or gateway module network fault

Symptoms

  • Driver door features inoperative or intermittent (power window, lock, mirror, puddle lamp)
  • Door-related warning messages or chimes
  • Central locking does not respond for driver door only
  • Scan tool shows no response or communication errors from DDM
  • Intermittent faults that change when door is opened/closed or wiring is moved

What to check

  • Read stored and pending codes with a capable scan tool; note freeze-frame and related U-codes
  • Visually inspect driver door module connector and door-jamb harness for corrosion, pin damage, or water intrusion
  • Check fuses and relay(s) related to driver door module power
  • Verify battery voltage and good chassis/engine ground
  • Backprobe DDM power and ground pins for stable voltage while operating door functions
  • Inspect CAN/LIN wiring continuity and insulation, especially at the hinge flex area

Signal parameters

  • DDM module supply voltage (key on and while operating functions)
  • DDM ground continuity and voltage drop under load
  • CAN High and CAN Low idle voltages (typical ~2.5 V each) and differential activity
  • LIN bus idle voltage and message activity (if DDM uses LIN)
  • Presence and frequency of expected DDM message IDs on the network
  • Error counters or message timeouts reported by BCM or gateway

Diagnostic algorithm

  1. Connect a capable scan tool and retrieve all B- and U-codes; record freeze frame and related network codes.
  2. Verify vehicle battery is charged and stable. Clear codes and see if the DDM fault returns to confirm persistent vs. temporary.
  3. Inspect the DDM connector, door hinge harness and jamb for damage, corrosion, or water ingress. Repair any visible issues.
  4. Check fuses and power/ground at the DDM connector. Backprobe the power pin with key on; verify good ground and correct supply voltage.
  5. Monitor CAN/LIN bus with a scope or scan tool. Verify idle voltages and that DDM message IDs appear. Look for bus errors, dominant states, or missing messages.
  6. Wiggle test the door harness and operate door functions while monitoring communication — look for intermittent failures tied to movement.
  7. If wiring and connectors are good, try swapping or reprogramming the DDM per manufacturer service procedures (or connect to dealer-level tool).
  8. If a replacement module is installed, follow proper module programming and security procedures. After repair, clear codes and verify system operation over multiple open/close cycles.
  9. If communication faults persist, investigate upstream modules (BCM/gateway) and the main network harness for faults; consult factory wiring diagrams and technical service bulletins.

Likely causes

  • Poor connector contact or corrosion at DDM connector or door jamb
  • Wiring break or chafe in the door harness at the hinge flex point
  • Loss of power or ground to the DDM (blown fuse, poor ground)
  • Failed DDM
  • Network bus fault (CAN/LIN) or BCM/gateway communication issue

Fault status

⚠️ Status
Driver Door Module communication fault detected — module not responding or messages missing/corrupted on the vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2956 U0073 U0100 U0140 U0164
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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

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