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Home / DTC / U0135 — Lost Communication With Differential Control Module - Front

U0135 — Lost Communication With Differential Control Module - Front

Detailed page for trouble code U0135.

34,405codes
59brands
11,914generic
22,491specific
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U0135

Generic U — Network/User

Lost Communication With Differential Control Module - Front

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

Causes

  • Faulty or unpowered Front Differential Control Module
  • Open or short in CAN high/low wiring between module and network
  • Poor or missing power or ground to the module (blown fuse, bad connector)
  • Corroded or damaged connector pins at module or harness
  • Faulty CAN transceiver inside module
  • Missing or failed termination resistor(s) on CAN bus

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lights for AWD/4WD/traction control
  • Loss of 4WD/AWD operation or automatic differential control
  • ABS/ESP or traction control warnings if systems share data
  • Inability to communicate with the front differential module with a scan tool
  • Intermittent faults or warnings that come and go
  • Reduced vehicle drivability or limp mode in some systems

What to check

  • Use a scan tool to read all stored U and related codes and note freeze frame data
  • Verify whether the front differential module appears on the network (module present in scan tool module list)
  • Check vehicle battery voltage and ground integrity
  • Inspect fuses and relays for the front differential module power circuit
  • Visually inspect the front differential module connector and harness for corrosion, bent pins, or damage
  • Measure CAN-H and CAN-L voltages at the module connector with ignition ON (see signal parameters)

Signal parameters

  • Typical idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each to battery negative) with small offset; differential ~0 V idle
  • During bus activity: differential voltage typically up to ~2 V (dominant bit), CAN_H rises above idle while CAN_L falls below idle
  • Expected bus data rates vary by vehicle (commonly 250 kb/s or 500 kb/s); message periodicity is manufacturer-specific
  • Termination: two 120 ohm resistors in parallel (≈60 Ω) across CAN_H and CAN_L at key nodes
  • Module should respond to diagnostic requests and periodically broadcast status messages (IDs and rates are manufacturer-specific)

Diagnostic algorithm

  1. Read and record all stored and pending codes from all modules; note if code is historical or active.
  2. Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
  3. If module is not present, inspect and verify module power (battery feed) and ground at the module connector; repair any open circuits and re-test.
  4. Check module fuses and relays related to differential control; replace if blown and investigate cause.
  5. With ignition ON, measure CAN_H and CAN_L at the module connector: verify idle voltages and look for bus activity while operating related systems (use oscilloscope if available).
  6. Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
  7. Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
  8. Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
  9. Disconnect the front differential module and check whether the rest of the network communication returns to normal (helps isolate a faulty module driving the bus).
  10. If wiring, power and network are good and the module still does not communicate, consider module replacement or repair and ensure proper programming/configuration per manufacturer procedures.
  11. After repairs, clear codes and confirm operation by verifying module communication and performing road test with scan tool monitoring.

Likely causes

  • Module has no battery feed or ground (blown fuse or open power circuit)
  • Connector corrosion or bent/broken pins at the differential module
  • Broken CAN-H/CAN-L wires or short to battery/ground
  • Failed CAN transceiver or internal module failure
  • Network termination missing or shorted after recent repairs or modifications

Fault status

⚠️ Status
Lost Communication with Front Differential Control Module. Differential controller not responding on vehicle data bus. Check module power, ground, connectors and CAN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0135

HYUNDAI U — Network/User

Lost Communication With Differential Control Module Front

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

Causes

  • Faulty or unpowered Front Differential Control Module
  • Open or short in CAN high/low wiring between module and network
  • Poor or missing power or ground to the module (blown fuse, bad connector)
  • Corroded or damaged connector pins at module or harness
  • Faulty CAN transceiver inside module
  • Missing or failed termination resistor(s) on CAN bus

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lights for AWD/4WD/traction control
  • Loss of 4WD/AWD operation or automatic differential control
  • ABS/ESP or traction control warnings if systems share data
  • Inability to communicate with the front differential module with a scan tool
  • Intermittent faults or warnings that come and go
  • Reduced vehicle drivability or limp mode in some systems

What to check

  • Use a scan tool to read all stored U and related codes and note freeze frame data
  • Verify whether the front differential module appears on the network (module present in scan tool module list)
  • Check vehicle battery voltage and ground integrity
  • Inspect fuses and relays for the front differential module power circuit
  • Visually inspect the front differential module connector and harness for corrosion, bent pins, or damage
  • Measure CAN-H and CAN-L voltages at the module connector with ignition ON (see signal parameters)

Signal parameters

  • Typical idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each to battery negative) with small offset; differential ~0 V idle
  • During bus activity: differential voltage typically up to ~2 V (dominant bit), CAN_H rises above idle while CAN_L falls below idle
  • Expected bus data rates vary by vehicle (commonly 250 kb/s or 500 kb/s); message periodicity is manufacturer-specific
  • Termination: two 120 ohm resistors in parallel (≈60 Ω) across CAN_H and CAN_L at key nodes
  • Module should respond to diagnostic requests and periodically broadcast status messages (IDs and rates are manufacturer-specific)

Diagnostic algorithm

  1. Read and record all stored and pending codes from all modules; note if code is historical or active.
  2. Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
  3. If module is not present, inspect and verify module power (battery feed) and ground at the module connector; repair any open circuits and re-test.
  4. Check module fuses and relays related to differential control; replace if blown and investigate cause.
  5. With ignition ON, measure CAN_H and CAN_L at the module connector: verify idle voltages and look for bus activity while operating related systems (use oscilloscope if available).
  6. Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
  7. Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
  8. Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
  9. Disconnect the front differential module and check whether the rest of the network communication returns to normal (helps isolate a faulty module driving the bus).
  10. If wiring, power and network are good and the module still does not communicate, consider module replacement or repair and ensure proper programming/configuration per manufacturer procedures.
  11. After repairs, clear codes and confirm operation by verifying module communication and performing road test with scan tool monitoring.

Likely causes

  • Module has no battery feed or ground (blown fuse or open power circuit)
  • Connector corrosion or bent/broken pins at the differential module
  • Broken CAN-H/CAN-L wires or short to battery/ground
  • Failed CAN transceiver or internal module failure
  • Network termination missing or shorted after recent repairs or modifications

Fault status

⚠️ Status
Lost Communication with Front Differential Control Module. Differential controller not responding on vehicle data bus. Check module power, ground, connectors and CAN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0131
371

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HYUNDAI

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

U0135

LAND ROVER U — Network/User

Lost communication with the front differential control module

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

Causes

  • Faulty or unpowered Front Differential Control Module
  • Open or short in CAN high/low wiring between module and network
  • Poor or missing power or ground to the module (blown fuse, bad connector)
  • Corroded or damaged connector pins at module or harness
  • Faulty CAN transceiver inside module
  • Missing or failed termination resistor(s) on CAN bus

Symptoms

  • Malfunction Indicator Lamp (MIL) or warning lights for AWD/4WD/traction control
  • Loss of 4WD/AWD operation or automatic differential control
  • ABS/ESP or traction control warnings if systems share data
  • Inability to communicate with the front differential module with a scan tool
  • Intermittent faults or warnings that come and go
  • Reduced vehicle drivability or limp mode in some systems

What to check

  • Use a scan tool to read all stored U and related codes and note freeze frame data
  • Verify whether the front differential module appears on the network (module present in scan tool module list)
  • Check vehicle battery voltage and ground integrity
  • Inspect fuses and relays for the front differential module power circuit
  • Visually inspect the front differential module connector and harness for corrosion, bent pins, or damage
  • Measure CAN-H and CAN-L voltages at the module connector with ignition ON (see signal parameters)

Signal parameters

  • Typical idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each to battery negative) with small offset; differential ~0 V idle
  • During bus activity: differential voltage typically up to ~2 V (dominant bit), CAN_H rises above idle while CAN_L falls below idle
  • Expected bus data rates vary by vehicle (commonly 250 kb/s or 500 kb/s); message periodicity is manufacturer-specific
  • Termination: two 120 ohm resistors in parallel (≈60 Ω) across CAN_H and CAN_L at key nodes
  • Module should respond to diagnostic requests and periodically broadcast status messages (IDs and rates are manufacturer-specific)

Diagnostic algorithm

  1. Read and record all stored and pending codes from all modules; note if code is historical or active.
  2. Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
  3. If module is not present, inspect and verify module power (battery feed) and ground at the module connector; repair any open circuits and re-test.
  4. Check module fuses and relays related to differential control; replace if blown and investigate cause.
  5. With ignition ON, measure CAN_H and CAN_L at the module connector: verify idle voltages and look for bus activity while operating related systems (use oscilloscope if available).
  6. Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
  7. Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
  8. Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
  9. Disconnect the front differential module and check whether the rest of the network communication returns to normal (helps isolate a faulty module driving the bus).
  10. If wiring, power and network are good and the module still does not communicate, consider module replacement or repair and ensure proper programming/configuration per manufacturer procedures.
  11. After repairs, clear codes and confirm operation by verifying module communication and performing road test with scan tool monitoring.

Likely causes

  • Module has no battery feed or ground (blown fuse or open power circuit)
  • Connector corrosion or bent/broken pins at the differential module
  • Broken CAN-H/CAN-L wires or short to battery/ground
  • Failed CAN transceiver or internal module failure
  • Network termination missing or shorted after recent repairs or modifications

Fault status

⚠️ Status
Lost Communication with Front Differential Control Module. Differential controller not responding on vehicle data bus. Check module power, ground, connectors and CAN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0131
283

Browse 283 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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

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