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Home / DTC / U0169 — Lost Communication With Sunroof Control Module

U0169 — Lost Communication With Sunroof Control Module

Detailed page for trouble code U0169.

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59brands
11,914generic
22,491specific
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U0169

Generic U — Network/User

Lost Communication With Sunroof Control Module

Brand: Generic
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted CAN/LIN communication wiring
  • Blown fuse or lost power to the sunroof module
  • Bad ground at the sunroof module
  • Corroded or disconnected connector(s)
  • Water intrusion or physical damage to the module or harness
  • Faulty sunroof control module

Symptoms

  • Sunroof inoperative or unresponsive to switch
  • No sunroof module listed on diagnostic network scan
  • Other modules report related communication DTCs
  • Possible illumination of a generic communication warning lamp
  • Intermittent operation of sunroof or related functions
  • Stored U0169 in vehicle fault memory

What to check

  • Read vehicle with a scan tool; confirm U0169 and note freeze-frame/ignition state
  • Verify whether the sunroof module appears on the network (module list)
  • Inspect fuse(s) for sunroof module and check for battery voltage at fuse
  • Visually inspect sunroof module connector and harness for corrosion, pin damage, or water
  • Check and measure battery voltage at the module power pin with key ON
  • Check ground continuity from module ground pin to chassis battery negative

Signal parameters

  • Battery feed to module: ~12 V (key ON) and stable
  • Ground: near 0 ohms continuity to chassis negative
  • CAN bus idle voltages (approx): CAN H ≈ 2.5 V, CAN L ≈ 2.5 V common-mode
  • CAN dominant state (approx): CAN H ~3.5 V, CAN L ~1.5 V during activity
  • Termination resistance: ~60 ohms between CAN H and CAN L (two 120 ohm terminators in parallel)
  • Typical CAN baud rates used: 125 kbps, 250 kbps, or 500 kbps (manufacturer dependent)

Diagnostic algorithm

  1. Connect a capable scan tool. Confirm U0169, note ignition state and any related codes. Attempt to communicate with the sunroof module.
  2. Verify whether the module appears on the module list or network. If absent, continue physical checks.
  3. Inspect the sunroof module connector and harness for corrosion, bent pins, water, or damage. Repair or dry as needed.
  4. Check the sunroof module power fuse(s). Verify battery voltage at the fuse and at the module power pin with key ON.
  5. Verify ground: measure continuity between module ground pin and battery negative. Repair high-resistance grounds.
  6. Measure CAN H and CAN L voltages at the module connector with ignition ON and while operating the sunroof switch. Compare to expected values.

Likely causes

  • Disconnected or corroded connector at the sunroof module
  • Blown fuse or missing battery feed to the module
  • Open or shorted CAN high/low wires between module and gateway
  • Failed sunroof control module electronics
  • Faulty ground or high-resistance ground connection
  • CAN bus termination fault (open or incorrect resistance)

Fault status

⚠️ Status
Lost Communication With Sunroof Control Module — sunroof module not responding on vehicle data bus. Check power, ground, connectors, CAN/LIN wiring, termination, and module/gateway.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0169

HYUNDAI U — Network/User

Lost Communication With Sunroof Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted CAN/LIN communication wiring
  • Blown fuse or lost power to the sunroof module
  • Bad ground at the sunroof module
  • Corroded or disconnected connector(s)
  • Water intrusion or physical damage to the module or harness
  • Faulty sunroof control module

Symptoms

  • Sunroof inoperative or unresponsive to switch
  • No sunroof module listed on diagnostic network scan
  • Other modules report related communication DTCs
  • Possible illumination of a generic communication warning lamp
  • Intermittent operation of sunroof or related functions
  • Stored U0169 in vehicle fault memory

What to check

  • Read vehicle with a scan tool; confirm U0169 and note freeze-frame/ignition state
  • Verify whether the sunroof module appears on the network (module list)
  • Inspect fuse(s) for sunroof module and check for battery voltage at fuse
  • Visually inspect sunroof module connector and harness for corrosion, pin damage, or water
  • Check and measure battery voltage at the module power pin with key ON
  • Check ground continuity from module ground pin to chassis battery negative

Signal parameters

  • Battery feed to module: ~12 V (key ON) and stable
  • Ground: near 0 ohms continuity to chassis negative
  • CAN bus idle voltages (approx): CAN H ≈ 2.5 V, CAN L ≈ 2.5 V common-mode
  • CAN dominant state (approx): CAN H ~3.5 V, CAN L ~1.5 V during activity
  • Termination resistance: ~60 ohms between CAN H and CAN L (two 120 ohm terminators in parallel)
  • Typical CAN baud rates used: 125 kbps, 250 kbps, or 500 kbps (manufacturer dependent)

Diagnostic algorithm

  1. Connect a capable scan tool. Confirm U0169, note ignition state and any related codes. Attempt to communicate with the sunroof module.
  2. Verify whether the module appears on the module list or network. If absent, continue physical checks.
  3. Inspect the sunroof module connector and harness for corrosion, bent pins, water, or damage. Repair or dry as needed.
  4. Check the sunroof module power fuse(s). Verify battery voltage at the fuse and at the module power pin with key ON.
  5. Verify ground: measure continuity between module ground pin and battery negative. Repair high-resistance grounds.
  6. Measure CAN H and CAN L voltages at the module connector with ignition ON and while operating the sunroof switch. Compare to expected values.

Likely causes

  • Disconnected or corroded connector at the sunroof module
  • Blown fuse or missing battery feed to the module
  • Open or shorted CAN high/low wires between module and gateway
  • Failed sunroof control module electronics
  • Faulty ground or high-resistance ground connection
  • CAN bus termination fault (open or incorrect resistance)

Fault status

⚠️ Status
Lost Communication With Sunroof Control Module — sunroof module not responding on vehicle data bus. Check power, ground, connectors, CAN/LIN wiring, termination, and module/gateway.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0121 U0155 U0164
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HYUNDAI

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