Code
U0135
Generic
U — Network/User
Lost Communication With Differential Control Module - Front
Views:
UK: 13
EN: 23
RU: 15
AI status
Completed
Completed
100%
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
- Read and record all stored and pending codes from all modules; note if code is historical or active.
- Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
- 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.
- Check module fuses and relays related to differential control; replace if blown and investigate cause.
- 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).
- Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
- Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
- Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
- 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).
- 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.
- 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
Views:
UK: 8
EN: 17
RU: 11
AI status
Completed
Completed
100%
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
- Read and record all stored and pending codes from all modules; note if code is historical or active.
- Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
- 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.
- Check module fuses and relays related to differential control; replace if blown and investigate cause.
- 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).
- Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
- Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
- Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
- 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).
- 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.
- 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
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Code
U0135
LAND ROVER
U — Network/User
Lost communication with the front differential control module
Views:
UK: 3
EN: 9
RU: 3
AI status
Completed
Completed
100%
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
- Read and record all stored and pending codes from all modules; note if code is historical or active.
- Attempt communication with the front differential module using a capable scan tool; confirm module presence or absence.
- 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.
- Check module fuses and relays related to differential control; replace if blown and investigate cause.
- 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).
- Measure resistance across CAN_H and CAN_L with power removed; expect ≈60 Ω. If open or very low, diagnose termination or short conditions.
- Visually inspect and, if necessary, disassemble connectors to inspect pins for corrosion, bent pins, or pushed-out terminals; repair as required.
- Perform a wiggle/stress test on harness while monitoring communication to find intermittent opens or shorts; if found, repair wiring harness.
- 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).
- 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.
- 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
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email