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Home / DTC / U1193 — Loss of VIM Class 2 Communication

U1193 — Loss of VIM Class 2 Communication

Detailed page for trouble code U1193.

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Code

U1193

HUMMER U — Network/User

Loss of VIM Class 2 Communication

Brand: HUMMER
Type: U — Network/User
Views: UK: 7 EN: 13 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in Class 2 serial data wiring
  • Corroded, loose, or damaged connector at the VIM
  • Blown fuse or loss of VIM power/ground
  • Faulty VIM module
  • Other module on the Class 2 bus pulling the network down
  • Low battery voltage or charging system issues

Symptoms

  • Loss of video/audio or infotainment features tied to the VIM
  • No video/camera output on display
  • Error or warning messages related to AV or network modules
  • Intermittent or complete loss of systems that use Class 2 messages
  • Multiple network-related trouble codes stored

What to check

  • Verify the battery is fully charged and charging system is within spec
  • Scan vehicle and record all stored/active codes and freeze frame data
  • Inspect VIM connector for corrosion, bent pins, or water intrusion
  • Check related fuses and power/ground circuits for the VIM
  • Visually inspect Class 2 wiring harness for damage or repairs
  • Use a scan tool to view Class 2 traffic — verify if VIM is shown and if messages are present

Signal parameters

  • Class 2 is a single-wire serial data bus — expected activity: periodic message bursts with varying pulse widths when ignition is ON
  • Bus idle and active levels vary with modules transmitting; diagnostic tool should show message traffic rather than a steady DC value
  • When network-active, a scan tool should show the VIM module present and responding to queries
  • No traffic or a bus held continuously low/high indicates wiring short or module fault

Diagnostic algorithm

  1. Connect a factory-capable scan tool and confirm U1193 is present; record any additional U-codes.
  2. Verify battery voltage and charging; perform a hard reset (battery disconnect) only if recommended by OEM procedures.
  3. Inspect VIM connector, pins, and ground points; repair or clean corrosion as required.
  4. Check fuses and power/ground circuits supplying the VIM; restore any open circuits.
  5. With ignition ON, use a scan tool to view Class 2 bus traffic. If no traffic, use a scope or voltmeter to check the data wire for activity.
  6. If bus is inactive or held low/high, isolate by disconnecting modules on the Class 2 network one at a time to find the device causing the fault or short.
  7. If the VIM is isolated and bus wiring checks good (continuity, no shorts), substitute or bench-test VIM per OEM guidance.
  8. If a replacement module is required, program/configure it with OEM software and recheck network communication and stored codes.
  9. Clear codes and verify repair by performing full functional check of affected systems and confirming no recurrence of U1193.

Likely causes

  • Disconnected or corroded connector at VIM
  • Damaged Class 2 wiring harness (chafing, rodent damage, pinched)
  • Blown fuse feeding the VIM
  • Defective VIM module
  • Another module shorting or holding the bus low

Fault status

⚠️ Status
Loss of VIM Class 2 Communication — VIM not responding on the Class 2 serial data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U1000 U0100 U0121 U0140 U1100
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Code

U1193

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Primary Id

Brand: Other
Type: U — Network/User
Views: UK: 13 EN: 21 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in Class 2 serial data wiring
  • Corroded, loose, or damaged connector at the VIM
  • Blown fuse or loss of VIM power/ground
  • Faulty VIM module
  • Other module on the Class 2 bus pulling the network down
  • Low battery voltage or charging system issues

Symptoms

  • Loss of video/audio or infotainment features tied to the VIM
  • No video/camera output on display
  • Error or warning messages related to AV or network modules
  • Intermittent or complete loss of systems that use Class 2 messages
  • Multiple network-related trouble codes stored

What to check

  • Verify the battery is fully charged and charging system is within spec
  • Scan vehicle and record all stored/active codes and freeze frame data
  • Inspect VIM connector for corrosion, bent pins, or water intrusion
  • Check related fuses and power/ground circuits for the VIM
  • Visually inspect Class 2 wiring harness for damage or repairs
  • Use a scan tool to view Class 2 traffic — verify if VIM is shown and if messages are present

Signal parameters

  • Class 2 is a single-wire serial data bus — expected activity: periodic message bursts with varying pulse widths when ignition is ON
  • Bus idle and active levels vary with modules transmitting; diagnostic tool should show message traffic rather than a steady DC value
  • When network-active, a scan tool should show the VIM module present and responding to queries
  • No traffic or a bus held continuously low/high indicates wiring short or module fault

Diagnostic algorithm

  1. Connect a factory-capable scan tool and confirm U1193 is present; record any additional U-codes.
  2. Verify battery voltage and charging; perform a hard reset (battery disconnect) only if recommended by OEM procedures.
  3. Inspect VIM connector, pins, and ground points; repair or clean corrosion as required.
  4. Check fuses and power/ground circuits supplying the VIM; restore any open circuits.
  5. With ignition ON, use a scan tool to view Class 2 bus traffic. If no traffic, use a scope or voltmeter to check the data wire for activity.
  6. If bus is inactive or held low/high, isolate by disconnecting modules on the Class 2 network one at a time to find the device causing the fault or short.
  7. If the VIM is isolated and bus wiring checks good (continuity, no shorts), substitute or bench-test VIM per OEM guidance.
  8. If a replacement module is required, program/configure it with OEM software and recheck network communication and stored codes.
  9. Clear codes and verify repair by performing full functional check of affected systems and confirming no recurrence of U1193.

Likely causes

  • Disconnected or corroded connector at VIM
  • Damaged Class 2 wiring harness (chafing, rodent damage, pinched)
  • Blown fuse feeding the VIM
  • Defective VIM module
  • Another module shorting or holding the bus low

Fault status

⚠️ Status
Loss of VIM Class 2 Communication — VIM not responding on the Class 2 serial data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U1000 U0100 U0121 U0140 U1100
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