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Home / DTC / U0144 — Lost Communication With Body Control Module D

U0144 — Lost Communication With Body Control Module D

Detailed page for trouble code U0144.

33,912codes
59brands
11,451generic
22,461specific
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Code

U0144

Generic U — Network/User

Lost Communication With Body Control Module D

Brand: Generic
Type: U — Network/User
Views: UK: 32 EN: 53 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty BCM D (internal failure)
  • Battery or charging system low voltage or intermittent
  • Poor or missing ground(s) to BCM D
  • Corroded, loose, or damaged BCM D connector(s) or pins
  • Open, shorted, or high-resistance wiring on CAN bus or dedicated LIN/wake circuits
  • Failed CAN bus transceiver or other network module driving the bus

Symptoms

  • One or more body systems inoperative (lights, locks, windows, wipers, alarm/immobilizer)
  • Instrument cluster or other modules reporting communication errors
  • No response or incomplete data from BCM D in a scan tool
  • Intermittent operation of convenience features
  • Multiple related DTCs stored in other modules referencing lost communication

What to check

  • Use a capable scan tool to confirm U0144 and check for related U‑codes in other modules
  • Record freeze frame and event counters, and note whether the fault is active or intermittent
  • Check battery voltage and charging system (key ON, engine OFF and while cranking/running)
  • Visually inspect BCM D connector, pins, and harness for corrosion, bent pins, or water intrusion
  • Verify BCM D ground(s) for tightness and low resistance to chassis/negative battery
  • Measure CAN bus voltages (CAN H and CAN L) at the BCM connector with key ON

Signal parameters

  • CAN bus recessive idle voltage: CAN H ≈ 2.5 V, CAN L ≈ 2.5 V (typical)
  • CAN bus dominant state: CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (differential ≈ 2 V)
  • Differential voltage (CANH − CANL) idle ≈ 0 V, dominant ≈ 2 V
  • Termination resistance across CAN H and CAN L ≈ 60 Ω (two 120 Ω terminators in parallel)
  • Battery voltage at BCM with key ON ≈ 12–14.5 V

Diagnostic algorithm

  1. Connect a diagnostic scan tool, verify U0144, note whether code is current or historical, and check for related codes in other modules.
  2. Verify battery voltage and charging system. Recharge or replace weak battery and ensure battery terminals are clean and tight.
  3. Inspect BCM D connector and harness for contamination, corrosion, bent pins, or water ingress. Repair or replace connector as needed.
  4. Verify ground(s) for BCM D: remove, clean contact surfaces, and measure resistance to battery negative (should be very low).
  5. With key ON, measure CAN H and CAN L at the BCM connector. Compare to expected values. If voltages are abnormal, isolate to wiring or other modules.
  6. Measure termination resistance across CAN H and CAN L at two points on the bus (expect ≈60 Ω). If open or shorted, locate missing/shorted terminator.
  7. Inspect and test wiring continuity between BCM D and other modules or the next connector on the CAN ring. Repair any opens, shorts to ground, or shorts to battery.
  8. If CAN signals look correct at the BCM connector but module does not respond, check power supply pins (constant and switched B+) and wake/ignition inputs for correct voltages.
  9. Check for bus traffic using a scope or CAN bus analyzer. Confirm whether BCM D transmits any messages or whether bus traffic stops when BCM is connected/disconnected.
  10. If wiring, power, grounds, and bus health are confirmed good and the BCM still fails to communicate, check for software updates/TSBs and consider replacing BCM D as a last step. Reprogram replacement module per manufacturer procedure.
  11. Clear codes and retest all affected systems. Monitor for recurrence and verify repair.

Likely causes

  • Loose or corroded connector at BCM D
  • Damaged CANH/CANL wiring near BCM D
  • Bad ground at BCM D or shared ground point
  • Low battery or poor battery connections causing sleep/wake faults
  • Failed BCM D module

Fault status

⚠️ Status
Lost Communication With Body Control Module D — No valid messages received from BCM D on the vehicle network (CAN/LIN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0144

HYUNDAI U — Network/User

Lost Communication With Body Control Module “D”

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 22 EN: 43 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty BCM D (internal failure)
  • Battery or charging system low voltage or intermittent
  • Poor or missing ground(s) to BCM D
  • Corroded, loose, or damaged BCM D connector(s) or pins
  • Open, shorted, or high-resistance wiring on CAN bus or dedicated LIN/wake circuits
  • Failed CAN bus transceiver or other network module driving the bus

Symptoms

  • One or more body systems inoperative (lights, locks, windows, wipers, alarm/immobilizer)
  • Instrument cluster or other modules reporting communication errors
  • No response or incomplete data from BCM D in a scan tool
  • Intermittent operation of convenience features
  • Multiple related DTCs stored in other modules referencing lost communication

What to check

  • Use a capable scan tool to confirm U0144 and check for related U‑codes in other modules
  • Record freeze frame and event counters, and note whether the fault is active or intermittent
  • Check battery voltage and charging system (key ON, engine OFF and while cranking/running)
  • Visually inspect BCM D connector, pins, and harness for corrosion, bent pins, or water intrusion
  • Verify BCM D ground(s) for tightness and low resistance to chassis/negative battery
  • Measure CAN bus voltages (CAN H and CAN L) at the BCM connector with key ON

Signal parameters

  • CAN bus recessive idle voltage: CAN H ≈ 2.5 V, CAN L ≈ 2.5 V (typical)
  • CAN bus dominant state: CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (differential ≈ 2 V)
  • Differential voltage (CANH − CANL) idle ≈ 0 V, dominant ≈ 2 V
  • Termination resistance across CAN H and CAN L ≈ 60 Ω (two 120 Ω terminators in parallel)
  • Battery voltage at BCM with key ON ≈ 12–14.5 V

Diagnostic algorithm

  1. Connect a diagnostic scan tool, verify U0144, note whether code is current or historical, and check for related codes in other modules.
  2. Verify battery voltage and charging system. Recharge or replace weak battery and ensure battery terminals are clean and tight.
  3. Inspect BCM D connector and harness for contamination, corrosion, bent pins, or water ingress. Repair or replace connector as needed.
  4. Verify ground(s) for BCM D: remove, clean contact surfaces, and measure resistance to battery negative (should be very low).
  5. With key ON, measure CAN H and CAN L at the BCM connector. Compare to expected values. If voltages are abnormal, isolate to wiring or other modules.
  6. Measure termination resistance across CAN H and CAN L at two points on the bus (expect ≈60 Ω). If open or shorted, locate missing/shorted terminator.
  7. Inspect and test wiring continuity between BCM D and other modules or the next connector on the CAN ring. Repair any opens, shorts to ground, or shorts to battery.
  8. If CAN signals look correct at the BCM connector but module does not respond, check power supply pins (constant and switched B+) and wake/ignition inputs for correct voltages.
  9. Check for bus traffic using a scope or CAN bus analyzer. Confirm whether BCM D transmits any messages or whether bus traffic stops when BCM is connected/disconnected.
  10. If wiring, power, grounds, and bus health are confirmed good and the BCM still fails to communicate, check for software updates/TSBs and consider replacing BCM D as a last step. Reprogram replacement module per manufacturer procedure.
  11. Clear codes and retest all affected systems. Monitor for recurrence and verify repair.

Likely causes

  • Loose or corroded connector at BCM D
  • Damaged CANH/CANL wiring near BCM D
  • Bad ground at BCM D or shared ground point
  • Low battery or poor battery connections causing sleep/wake faults
  • Failed BCM D module

Fault status

⚠️ Status
Lost Communication With Body Control Module D — No valid messages received from BCM D on the vehicle network (CAN/LIN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0141 U0142 U0143 U0164
370

Browse 370 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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

U0144

LAND ROVER U — Network/User

Lost communication with the body control module D

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 14 EN: 42 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty BCM D (internal failure)
  • Battery or charging system low voltage or intermittent
  • Poor or missing ground(s) to BCM D
  • Corroded, loose, or damaged BCM D connector(s) or pins
  • Open, shorted, or high-resistance wiring on CAN bus or dedicated LIN/wake circuits
  • Failed CAN bus transceiver or other network module driving the bus

Symptoms

  • One or more body systems inoperative (lights, locks, windows, wipers, alarm/immobilizer)
  • Instrument cluster or other modules reporting communication errors
  • No response or incomplete data from BCM D in a scan tool
  • Intermittent operation of convenience features
  • Multiple related DTCs stored in other modules referencing lost communication

What to check

  • Use a capable scan tool to confirm U0144 and check for related U‑codes in other modules
  • Record freeze frame and event counters, and note whether the fault is active or intermittent
  • Check battery voltage and charging system (key ON, engine OFF and while cranking/running)
  • Visually inspect BCM D connector, pins, and harness for corrosion, bent pins, or water intrusion
  • Verify BCM D ground(s) for tightness and low resistance to chassis/negative battery
  • Measure CAN bus voltages (CAN H and CAN L) at the BCM connector with key ON

Signal parameters

  • CAN bus recessive idle voltage: CAN H ≈ 2.5 V, CAN L ≈ 2.5 V (typical)
  • CAN bus dominant state: CAN H ≈ 3.5 V, CAN L ≈ 1.5 V (differential ≈ 2 V)
  • Differential voltage (CANH − CANL) idle ≈ 0 V, dominant ≈ 2 V
  • Termination resistance across CAN H and CAN L ≈ 60 Ω (two 120 Ω terminators in parallel)
  • Battery voltage at BCM with key ON ≈ 12–14.5 V

Diagnostic algorithm

  1. Connect a diagnostic scan tool, verify U0144, note whether code is current or historical, and check for related codes in other modules.
  2. Verify battery voltage and charging system. Recharge or replace weak battery and ensure battery terminals are clean and tight.
  3. Inspect BCM D connector and harness for contamination, corrosion, bent pins, or water ingress. Repair or replace connector as needed.
  4. Verify ground(s) for BCM D: remove, clean contact surfaces, and measure resistance to battery negative (should be very low).
  5. With key ON, measure CAN H and CAN L at the BCM connector. Compare to expected values. If voltages are abnormal, isolate to wiring or other modules.
  6. Measure termination resistance across CAN H and CAN L at two points on the bus (expect ≈60 Ω). If open or shorted, locate missing/shorted terminator.
  7. Inspect and test wiring continuity between BCM D and other modules or the next connector on the CAN ring. Repair any opens, shorts to ground, or shorts to battery.
  8. If CAN signals look correct at the BCM connector but module does not respond, check power supply pins (constant and switched B+) and wake/ignition inputs for correct voltages.
  9. Check for bus traffic using a scope or CAN bus analyzer. Confirm whether BCM D transmits any messages or whether bus traffic stops when BCM is connected/disconnected.
  10. If wiring, power, grounds, and bus health are confirmed good and the BCM still fails to communicate, check for software updates/TSBs and consider replacing BCM D as a last step. Reprogram replacement module per manufacturer procedure.
  11. Clear codes and retest all affected systems. Monitor for recurrence and verify repair.

Likely causes

  • Loose or corroded connector at BCM D
  • Damaged CANH/CANL wiring near BCM D
  • Bad ground at BCM D or shared ground point
  • Low battery or poor battery connections causing sleep/wake faults
  • Failed BCM D module

Fault status

⚠️ Status
Lost Communication With Body Control Module D — No valid messages received from BCM D on the vehicle network (CAN/LIN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0141 U0142 U0143 U0164
160

Browse 160 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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