Code
U2107
HUMMER
U — Network/User
Control Module Communication Timeout
Views:
UK: 13
EN: 20
RU: 11
AI status
Completed
Completed
100%
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
- Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
- Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
- Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
- Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
- Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
- With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
- 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.
- Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
- 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.
- 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.
- 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
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Code
U2107
LAND ROVER
U — Network/User
Collision reduction by braking
Views:
UK: 7
EN: 18
RU: 7
AI status
Completed
Completed
100%
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
- Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
- Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
- Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
- Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
- Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
- With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
- 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.
- Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
- 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.
- 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.
- 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
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
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Your experience will help others
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Code
U2107
OPEL
U — Network/User
CAN-Bus No Communication with IPC (Instrument)
Views:
UK: 5
EN: 8
RU: 5
AI status
Completed
Completed
100%
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
- Record all stored DTCs, freeze frame and module responses with a scan tool. Note which module(s) timed out.
- Clear codes and attempt to re-create the fault. Verify if U2107 returns and under what conditions (key cycle, drive, accessory operation).
- Verify battery and charging system voltage (key on ~12.0–13.0 V, charging system typically ~13.5–14.8 V running).
- Attempt to communicate with the affected module. If the scan tool cannot connect, suspect module power/ground or bus wiring.
- Inspect connectors: disconnect and inspect pins for corrosion, bent pins, water intrusion. Wiggle test harness while monitoring communication.
- With ignition off, measure resistance across CAN H and CAN L to confirm proper termination (~60 ohms).
- 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.
- Probe power and ground circuits at the module with DMM/oscilloscope to confirm stable supply under all conditions when fault occurs.
- 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.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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