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Home / DTC / U2107 — Control Module Communication Timeout

U2107 — Control Module Communication Timeout

Detailed page for trouble code U2107.

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22,491specific
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U2107

HUMMER U — Network/User

Control Module Communication Timeout

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

Causes

  • Intermittent or lost power to the affected control module
  • Poor or missing ground at the module or harness
  • Damaged, corroded or loose connector(s) on the communication bus
  • Physical damage to the bus wiring (short to battery, short to ground, open)
  • Failed or intermittent control module
  • Faulty or missing bus termination resistor(s)

Symptoms

  • MIL (check engine) or other warning lights illuminated
  • Loss or intermittent operation of systems controlled by the non‑responding module
  • Unable to communicate with the affected module using a scan tool
  • Intermittent drivability or electrical anomalies tied to that module's functions
  • Other network DTCs may be present (multiple modules reporting comm errors)

What to check

  • Connect a professional scan tool and read all DTCs and freeze frame data; note which module(s) report communication errors
  • Attempt to communicate with the suspected module using the scan tool (module present/absent)
  • Check battery voltage (engine off and cranking) and charging system health
  • Visually inspect connectors and wiring for damage, corrosion, or moisture at the module and along harness
  • Verify module power and ground with a digital multimeter (key on)
  • Measure CAN bus termination resistance (approx. 60 ohm across CAN H-L with key off)

Signal parameters

  • CAN idle voltages: approximately CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ~0 V at idle, dominates around ±1 V during recessive/dominant states)
  • Typical CAN differential swing during traffic: approximately 1.5–2.0 V
  • Common CAN bus speeds: 250 kbps or 500 kbps (verify vehicle-specific baud rate)
  • Expected message periodicity: many modules transmit periodic messages every 10–1000 ms depending on signal
  • Bus termination: total ~60 ohms across CAN H and CAN L (two 120 ohm resistors in parallel)

Diagnostic algorithm

  1. Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
  2. Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
  3. Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
  4. Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
  5. Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
  6. With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
  7. With ignition on or engine running as required, use a scope to observe CAN_H and CAN_L waveforms at the module connector and at a known-good node. Look for missing messages, excessive noise, or no activity.
  8. Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
  9. If a wiring short/open is suspected, isolate segments by unplugging downstream connectors or modules to locate the fault. Repair any damaged wiring or connectors.
  10. If wiring and power/ground are good and the bus signals are valid at other nodes but the module remains non‑responsive, consider replacing or reprogramming the module per manufacturer service procedures.
  11. After repairs, clear DTCs and verify proper communication and function during key cycles and a road test.

Likely causes

  • Loose or corroded connector at the reported module
  • Open or shorted CAN/LIN wires between modules
  • Bad ground strap or ground point near the module
  • Module without battery power or failing power supply
  • Failed control module (intermittent internal fault)
  • Missing/failed termination (often 60 ohm across CAN H/L)

Fault status

⚠️ Status
Control module failed to respond to network communications within the expected timeout period; communication with the module was lost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0073 U0100 U0121 U0140 U1000 U2100
Repair manuals

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138

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Code

U2107

LAND ROVER U — Network/User

Collision reduction by braking

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

Causes

  • Intermittent or lost power to the affected control module
  • Poor or missing ground at the module or harness
  • Damaged, corroded or loose connector(s) on the communication bus
  • Physical damage to the bus wiring (short to battery, short to ground, open)
  • Failed or intermittent control module
  • Faulty or missing bus termination resistor(s)

Symptoms

  • MIL (check engine) or other warning lights illuminated
  • Loss or intermittent operation of systems controlled by the non‑responding module
  • Unable to communicate with the affected module using a scan tool
  • Intermittent drivability or electrical anomalies tied to that module's functions
  • Other network DTCs may be present (multiple modules reporting comm errors)

What to check

  • Connect a professional scan tool and read all DTCs and freeze frame data; note which module(s) report communication errors
  • Attempt to communicate with the suspected module using the scan tool (module present/absent)
  • Check battery voltage (engine off and cranking) and charging system health
  • Visually inspect connectors and wiring for damage, corrosion, or moisture at the module and along harness
  • Verify module power and ground with a digital multimeter (key on)
  • Measure CAN bus termination resistance (approx. 60 ohm across CAN H-L with key off)

Signal parameters

  • CAN idle voltages: approximately CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ~0 V at idle, dominates around ±1 V during recessive/dominant states)
  • Typical CAN differential swing during traffic: approximately 1.5–2.0 V
  • Common CAN bus speeds: 250 kbps or 500 kbps (verify vehicle-specific baud rate)
  • Expected message periodicity: many modules transmit periodic messages every 10–1000 ms depending on signal
  • Bus termination: total ~60 ohms across CAN H and CAN L (two 120 ohm resistors in parallel)

Diagnostic algorithm

  1. Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
  2. Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
  3. Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
  4. Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
  5. Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
  6. With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
  7. With ignition on or engine running as required, use a scope to observe CAN_H and CAN_L waveforms at the module connector and at a known-good node. Look for missing messages, excessive noise, or no activity.
  8. Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
  9. If a wiring short/open is suspected, isolate segments by unplugging downstream connectors or modules to locate the fault. Repair any damaged wiring or connectors.
  10. If wiring and power/ground are good and the bus signals are valid at other nodes but the module remains non‑responsive, consider replacing or reprogramming the module per manufacturer service procedures.
  11. After repairs, clear DTCs and verify proper communication and function during key cycles and a road test.

Likely causes

  • Loose or corroded connector at the reported module
  • Open or shorted CAN/LIN wires between modules
  • Bad ground strap or ground point near the module
  • Module without battery power or failing power supply
  • Failed control module (intermittent internal fault)
  • Missing/failed termination (often 60 ohm across CAN H/L)

Fault status

⚠️ Status
Control module failed to respond to network communications within the expected timeout period; communication with the module was lost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0073 U0100 U0121 U0140 U1000 U2100
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

U2107

OPEL U — Network/User

CAN-Bus No Communication with IPC (Instrument)

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

Causes

  • Intermittent or lost power to the affected control module
  • Poor or missing ground at the module or harness
  • Damaged, corroded or loose connector(s) on the communication bus
  • Physical damage to the bus wiring (short to battery, short to ground, open)
  • Failed or intermittent control module
  • Faulty or missing bus termination resistor(s)

Symptoms

  • MIL (check engine) or other warning lights illuminated
  • Loss or intermittent operation of systems controlled by the non‑responding module
  • Unable to communicate with the affected module using a scan tool
  • Intermittent drivability or electrical anomalies tied to that module's functions
  • Other network DTCs may be present (multiple modules reporting comm errors)

What to check

  • Connect a professional scan tool and read all DTCs and freeze frame data; note which module(s) report communication errors
  • Attempt to communicate with the suspected module using the scan tool (module present/absent)
  • Check battery voltage (engine off and cranking) and charging system health
  • Visually inspect connectors and wiring for damage, corrosion, or moisture at the module and along harness
  • Verify module power and ground with a digital multimeter (key on)
  • Measure CAN bus termination resistance (approx. 60 ohm across CAN H-L with key off)

Signal parameters

  • CAN idle voltages: approximately CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ~0 V at idle, dominates around ±1 V during recessive/dominant states)
  • Typical CAN differential swing during traffic: approximately 1.5–2.0 V
  • Common CAN bus speeds: 250 kbps or 500 kbps (verify vehicle-specific baud rate)
  • Expected message periodicity: many modules transmit periodic messages every 10–1000 ms depending on signal
  • Bus termination: total ~60 ohms across CAN H and CAN L (two 120 ohm resistors in parallel)

Diagnostic algorithm

  1. Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
  2. Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
  3. Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
  4. Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
  5. Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
  6. With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
  7. With ignition on or engine running as required, use a scope to observe CAN_H and CAN_L waveforms at the module connector and at a known-good node. Look for missing messages, excessive noise, or no activity.
  8. Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
  9. If a wiring short/open is suspected, isolate segments by unplugging downstream connectors or modules to locate the fault. Repair any damaged wiring or connectors.
  10. If wiring and power/ground are good and the bus signals are valid at other nodes but the module remains non‑responsive, consider replacing or reprogramming the module per manufacturer service procedures.
  11. After repairs, clear DTCs and verify proper communication and function during key cycles and a road test.

Likely causes

  • Loose or corroded connector at the reported module
  • Open or shorted CAN/LIN wires between modules
  • Bad ground strap or ground point near the module
  • Module without battery power or failing power supply
  • Failed control module (intermittent internal fault)
  • Missing/failed termination (often 60 ohm across CAN H/L)

Fault status

⚠️ Status
Control module failed to respond to network communications within the expected timeout period; communication with the module was lost.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0073 U0100 U0121 U0140 U1000 U2100
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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