Code
U0141
Generic
U — Network/User
Lost Communication With Body Control Module A
Views:
UK: 21
EN: 54
RU: 32
AI status
Completed
Completed
100%
Causes
- Open, shorted or high-resistance wiring/circuits between modules and BCM
- BCM A has no battery power or poor ground
- Faulty BCM A (internal failure)
- CAN/LIN bus fault (physical layer or termination)
- Faulty connector, corrosion, or water intrusion
- Blown fuse or ignition-switched power loss to BCM
Symptoms
- Loss of body functions controlled by BCM (door locks, lights, wipers, etc.)
- No communication with BCM via scan tool
- Multiple related DTCs for body modules or network
- Warning lights or message center errors
- Remote keyless entry, security, or immobilizer faults
- Intermittent operation of interior/exterior lighting or convenience features
What to check
- Read all stored and pending DTCs and freeze frame data from all modules
- Confirm scan tool cannot communicate with BCM and note any other U-codes
- Verify battery voltage at vehicle (12.4–12.8 V resting; >13 V with engine running)
- Check BCM fuses and relay(s) for continuity and proper power
- Inspect BCM connectors for corrosion, bent pins, or water intrusion
- Check primary ground(s) for BCM for tightness and low resistance
Signal parameters
- Idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Differential idle voltage ≈ 0 V; dominant differential ≈ 2.0 V
- Bus termination ≈ 60 ohms (two 120-ohm terminators in parallel)
- Typical CAN data rates: 125 kb/s, 250 kb/s, 500 kb/s (vehicle-specific)
- LIN bus idle ≈ battery voltage (if applicable for BCM wake lines)
Diagnostic algorithm
- Retrieve freeze frame and all related U- and P-codes from all modules; document symptoms and start conditions.
- Attempt to communicate with BCM using a capable scan tool. Verify the module ID and whether it responds intermittently or not at all.
- Inspect BCM power and ground: verify fuse(s), measure battery feed and ground voltage at the BCM connector with key on and during attempted communication.
- Visually inspect BCM connector and harness for corrosion, water, bent pins, or signs of repair. Wiggle harness while monitoring communication to check for intermittent faults.
- Measure CAN bus voltages at the BCM connector (CAN_H and CAN_L) with key on, engine off. Compare to expected idle values and check for short to battery/ground.
- Measure termination resistance between CAN_H and CAN_L with power off; look for approx. 60 ohms. If open or incorrect, isolate which terminator is missing.
- Use a scope or CAN bus analyzer to check for valid frames and waveform integrity at the BCM. Look for noise, voltage offsets, missing frames, or bus arbitration errors.
- Isolate the network: disconnect suspected modules or aftermarket devices one at a time to see if communication is restored. Pay attention to modules that share the same gateway or trunk lines.
- Repair any wiring faults, replace corroded connectors, restore proper power/ground and termination. If BCM has proper power/ground and bus is good but no communication, consider BCM replacement or reprogramming per manufacturer procedure.
- After repairs, clear codes, perform relearn/programming if required, and verify normal operation over a road test and with multiple ignition cycles.
Likely causes
- Blown fuse or disconnected battery/power feed to BCM
- Corroded connector or poor ground at BCM
- Damaged CAN high/low wires (open/short)
- Faulty BCM (failed transceiver or internal electronics)
- Network termination resistor open or incorrect value
- Module asleep / not awake due to wake signal failure
Fault status
Status
Stored when the control module fails to receive expected messages from Body Control Module A (BCM-A) within a defined timeout period. May be set as active, pending or history depending on occurrence and ignition cycles.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
U0141
HYUNDAI
U — Network/User
Lost Communication With Body Control Module “A”
Views:
UK: 13
EN: 40
RU: 22
AI status
Completed
Completed
100%
Causes
- Open, shorted or high-resistance wiring/circuits between modules and BCM
- BCM A has no battery power or poor ground
- Faulty BCM A (internal failure)
- CAN/LIN bus fault (physical layer or termination)
- Faulty connector, corrosion, or water intrusion
- Blown fuse or ignition-switched power loss to BCM
Symptoms
- Loss of body functions controlled by BCM (door locks, lights, wipers, etc.)
- No communication with BCM via scan tool
- Multiple related DTCs for body modules or network
- Warning lights or message center errors
- Remote keyless entry, security, or immobilizer faults
- Intermittent operation of interior/exterior lighting or convenience features
What to check
- Read all stored and pending DTCs and freeze frame data from all modules
- Confirm scan tool cannot communicate with BCM and note any other U-codes
- Verify battery voltage at vehicle (12.4–12.8 V resting; >13 V with engine running)
- Check BCM fuses and relay(s) for continuity and proper power
- Inspect BCM connectors for corrosion, bent pins, or water intrusion
- Check primary ground(s) for BCM for tightness and low resistance
Signal parameters
- Idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Differential idle voltage ≈ 0 V; dominant differential ≈ 2.0 V
- Bus termination ≈ 60 ohms (two 120-ohm terminators in parallel)
- Typical CAN data rates: 125 kb/s, 250 kb/s, 500 kb/s (vehicle-specific)
- LIN bus idle ≈ battery voltage (if applicable for BCM wake lines)
Diagnostic algorithm
- Retrieve freeze frame and all related U- and P-codes from all modules; document symptoms and start conditions.
- Attempt to communicate with BCM using a capable scan tool. Verify the module ID and whether it responds intermittently or not at all.
- Inspect BCM power and ground: verify fuse(s), measure battery feed and ground voltage at the BCM connector with key on and during attempted communication.
- Visually inspect BCM connector and harness for corrosion, water, bent pins, or signs of repair. Wiggle harness while monitoring communication to check for intermittent faults.
- Measure CAN bus voltages at the BCM connector (CAN_H and CAN_L) with key on, engine off. Compare to expected idle values and check for short to battery/ground.
- Measure termination resistance between CAN_H and CAN_L with power off; look for approx. 60 ohms. If open or incorrect, isolate which terminator is missing.
- Use a scope or CAN bus analyzer to check for valid frames and waveform integrity at the BCM. Look for noise, voltage offsets, missing frames, or bus arbitration errors.
- Isolate the network: disconnect suspected modules or aftermarket devices one at a time to see if communication is restored. Pay attention to modules that share the same gateway or trunk lines.
- Repair any wiring faults, replace corroded connectors, restore proper power/ground and termination. If BCM has proper power/ground and bus is good but no communication, consider BCM replacement or reprogramming per manufacturer procedure.
- After repairs, clear codes, perform relearn/programming if required, and verify normal operation over a road test and with multiple ignition cycles.
Likely causes
- Blown fuse or disconnected battery/power feed to BCM
- Corroded connector or poor ground at BCM
- Damaged CAN high/low wires (open/short)
- Faulty BCM (failed transceiver or internal electronics)
- Network termination resistor open or incorrect value
- Module asleep / not awake due to wake signal failure
Fault status
Status
Stored when the control module fails to receive expected messages from Body Control Module A (BCM-A) within a defined timeout period. May be set as active, pending or history depending on occurrence and ignition cycles.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
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Code
U0141
LAND ROVER
U — Network/User
Lost communication with the body control module A
Views:
UK: 9
EN: 30
RU: 14
AI status
Completed
Completed
100%
Causes
- Open, shorted or high-resistance wiring/circuits between modules and BCM
- BCM A has no battery power or poor ground
- Faulty BCM A (internal failure)
- CAN/LIN bus fault (physical layer or termination)
- Faulty connector, corrosion, or water intrusion
- Blown fuse or ignition-switched power loss to BCM
Symptoms
- Loss of body functions controlled by BCM (door locks, lights, wipers, etc.)
- No communication with BCM via scan tool
- Multiple related DTCs for body modules or network
- Warning lights or message center errors
- Remote keyless entry, security, or immobilizer faults
- Intermittent operation of interior/exterior lighting or convenience features
What to check
- Read all stored and pending DTCs and freeze frame data from all modules
- Confirm scan tool cannot communicate with BCM and note any other U-codes
- Verify battery voltage at vehicle (12.4–12.8 V resting; >13 V with engine running)
- Check BCM fuses and relay(s) for continuity and proper power
- Inspect BCM connectors for corrosion, bent pins, or water intrusion
- Check primary ground(s) for BCM for tightness and low resistance
Signal parameters
- Idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
- Dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Differential idle voltage ≈ 0 V; dominant differential ≈ 2.0 V
- Bus termination ≈ 60 ohms (two 120-ohm terminators in parallel)
- Typical CAN data rates: 125 kb/s, 250 kb/s, 500 kb/s (vehicle-specific)
- LIN bus idle ≈ battery voltage (if applicable for BCM wake lines)
Diagnostic algorithm
- Retrieve freeze frame and all related U- and P-codes from all modules; document symptoms and start conditions.
- Attempt to communicate with BCM using a capable scan tool. Verify the module ID and whether it responds intermittently or not at all.
- Inspect BCM power and ground: verify fuse(s), measure battery feed and ground voltage at the BCM connector with key on and during attempted communication.
- Visually inspect BCM connector and harness for corrosion, water, bent pins, or signs of repair. Wiggle harness while monitoring communication to check for intermittent faults.
- Measure CAN bus voltages at the BCM connector (CAN_H and CAN_L) with key on, engine off. Compare to expected idle values and check for short to battery/ground.
- Measure termination resistance between CAN_H and CAN_L with power off; look for approx. 60 ohms. If open or incorrect, isolate which terminator is missing.
- Use a scope or CAN bus analyzer to check for valid frames and waveform integrity at the BCM. Look for noise, voltage offsets, missing frames, or bus arbitration errors.
- Isolate the network: disconnect suspected modules or aftermarket devices one at a time to see if communication is restored. Pay attention to modules that share the same gateway or trunk lines.
- Repair any wiring faults, replace corroded connectors, restore proper power/ground and termination. If BCM has proper power/ground and bus is good but no communication, consider BCM replacement or reprogramming per manufacturer procedure.
- After repairs, clear codes, perform relearn/programming if required, and verify normal operation over a road test and with multiple ignition cycles.
Likely causes
- Blown fuse or disconnected battery/power feed to BCM
- Corroded connector or poor ground at BCM
- Damaged CAN high/low wires (open/short)
- Faulty BCM (failed transceiver or internal electronics)
- Network termination resistor open or incorrect value
- Module asleep / not awake due to wake signal failure
Fault status
Status
Stored when the control module fails to receive expected messages from Body Control Module A (BCM-A) within a defined timeout period. May be set as active, pending or history depending on occurrence and ignition cycles.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
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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?
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