Code
U0199
Generic
U — Network/User
Lost Communication With Door Control Module A
Views:
UK: 19
EN: 62
RU: 29
AI status
Completed
Completed
100%
Causes
- Physical damage or break in the door harness (commonly at door hinge/boot)
- Corroded or loose connector at the door module or body harness
- Blown fuse or missing power/ground to the door control module
- Faulty door control module (internal electronics failure)
- Short or open on the CAN bus (CAN High / CAN Low) or missing bus termination
- Network wiring shorted to battery or ground, or high resistance in the CAN lines
Symptoms
- DTC U0199 stored (Lost Communication With Door Control Module A)
- One or more doors do not lock/unlock with key fob or door switches
- Power windows, mirror adjustments, or interior lights behave intermittently or do not operate
- Door ajar / status message missing or incorrect on dash
- Other modules report additional U-codes related to missing door module
- Chimes, courtesy lights, or alarm functions may not operate for that door
What to check
- Use a scan tool to verify U0199 and check for additional U-codes; confirm if the door control module is listed on the network
- Check battery voltage and main body/door fuses with key on and engine off
- Visually inspect door module connector, pins, and door jamb harness for damage, corrosion, or water intrusion
- Wiggle test wiring in the door hinge area while watching live data/messages for intermittent connection
- Measure CAN bus voltages at a known-good location and at the door module connector (see signal parameters)
- Check CAN bus termination resistance (~60 ohms across CANH and CANL for two 120-ohm terminators in parallel)
Signal parameters
- High-speed CAN idle common-mode: about 2.5 V on both CANH and CANL
- Dominant state: CANH ~3.5 V, CANL ~1.5 V (levels vary by vehicle)
- Bus differential (CANH - CANL) ~0 V (recessive) to ~2.0 V (dominant); verify with oscilloscope if available
- Termination: approx. 60 ohms measured across CANH and CANL at key network points (vehicle dependent)
- Typical baud rates: commonly 500 kb/s or 250 kb/s on high-speed CAN — confirm vehicle specification
- Power supply to module: battery voltage within ~0.5 V of vehicle battery on key-on; ground should be near 0 ohms to chassis
Diagnostic algorithm
- Connect a scan tool and confirm U0199 and any related codes. Record freeze frame / live data and which modules see the door module.
- Check battery voltage and body power fuses related to door electronics. Replace any blown fuses and re-test.
- Visually inspect the door module connector and door jamb harness for damage, corrosion, or pin push-out. Repair or replace damaged connectors.
- With ignition on, check presence of the door module on the network via scan tool. If not present, measure power and ground at the module connector.
- Backprobe CANH and CANL at the module connector and at a known-good network node. Verify idle voltages and differential activity with a multimeter or oscilloscope.
- If CAN signals are absent at the module but present elsewhere, trace wiring between the door module and the main harness (pay attention to the hinge/boot area). Repair any opens/shorts.
- If CAN lines show unexpected voltages (short to Vbatt or ground), isolate and locate the short by disconnecting sections or modules until normal levels return.
- Perform wiggle tests on the harness while monitoring communication to find intermittent faults. Repair broken conductors or replace the harness as needed.
- If wiring and power/grounds are good but the module does not communicate, attempt module reset/reprogramming per manufacturer procedure. If still non-responsive, consider module replacement and programming.
- After repairs, clear codes and perform functional checks of door functions and verify no reoccurrence of U0199.
Likely causes
- Broken conductor in the door jamb harness from repeated door movement
- Corrosion/poor pin contact at the door module connector allowing intermittent comms
- Blown fuse supplying the door module (check fuses for body/door circuits)
- Failed door control module due to water intrusion or electrical surge
- CANH or CANL shorted to power or ground in a door wiring splice
- Missing termination resistor or open termination causing bus reflections
Fault status
Status
Lost Communication With Door Control Module A — no valid CAN messages received from the door control module. Module may be unpowered, disconnected, or the network has an open/short.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
U0199
HYUNDAI
U — Network/User
Lost Communication With “Door Control Module A”
Views:
UK: 12
EN: 54
RU: 22
AI status
Completed
Completed
100%
Causes
- Physical damage or break in the door harness (commonly at door hinge/boot)
- Corroded or loose connector at the door module or body harness
- Blown fuse or missing power/ground to the door control module
- Faulty door control module (internal electronics failure)
- Short or open on the CAN bus (CAN High / CAN Low) or missing bus termination
- Network wiring shorted to battery or ground, or high resistance in the CAN lines
Symptoms
- DTC U0199 stored (Lost Communication With Door Control Module A)
- One or more doors do not lock/unlock with key fob or door switches
- Power windows, mirror adjustments, or interior lights behave intermittently or do not operate
- Door ajar / status message missing or incorrect on dash
- Other modules report additional U-codes related to missing door module
- Chimes, courtesy lights, or alarm functions may not operate for that door
What to check
- Use a scan tool to verify U0199 and check for additional U-codes; confirm if the door control module is listed on the network
- Check battery voltage and main body/door fuses with key on and engine off
- Visually inspect door module connector, pins, and door jamb harness for damage, corrosion, or water intrusion
- Wiggle test wiring in the door hinge area while watching live data/messages for intermittent connection
- Measure CAN bus voltages at a known-good location and at the door module connector (see signal parameters)
- Check CAN bus termination resistance (~60 ohms across CANH and CANL for two 120-ohm terminators in parallel)
Signal parameters
- High-speed CAN idle common-mode: about 2.5 V on both CANH and CANL
- Dominant state: CANH ~3.5 V, CANL ~1.5 V (levels vary by vehicle)
- Bus differential (CANH - CANL) ~0 V (recessive) to ~2.0 V (dominant); verify with oscilloscope if available
- Termination: approx. 60 ohms measured across CANH and CANL at key network points (vehicle dependent)
- Typical baud rates: commonly 500 kb/s or 250 kb/s on high-speed CAN — confirm vehicle specification
- Power supply to module: battery voltage within ~0.5 V of vehicle battery on key-on; ground should be near 0 ohms to chassis
Diagnostic algorithm
- Connect a scan tool and confirm U0199 and any related codes. Record freeze frame / live data and which modules see the door module.
- Check battery voltage and body power fuses related to door electronics. Replace any blown fuses and re-test.
- Visually inspect the door module connector and door jamb harness for damage, corrosion, or pin push-out. Repair or replace damaged connectors.
- With ignition on, check presence of the door module on the network via scan tool. If not present, measure power and ground at the module connector.
- Backprobe CANH and CANL at the module connector and at a known-good network node. Verify idle voltages and differential activity with a multimeter or oscilloscope.
- If CAN signals are absent at the module but present elsewhere, trace wiring between the door module and the main harness (pay attention to the hinge/boot area). Repair any opens/shorts.
- If CAN lines show unexpected voltages (short to Vbatt or ground), isolate and locate the short by disconnecting sections or modules until normal levels return.
- Perform wiggle tests on the harness while monitoring communication to find intermittent faults. Repair broken conductors or replace the harness as needed.
- If wiring and power/grounds are good but the module does not communicate, attempt module reset/reprogramming per manufacturer procedure. If still non-responsive, consider module replacement and programming.
- After repairs, clear codes and perform functional checks of door functions and verify no reoccurrence of U0199.
Likely causes
- Broken conductor in the door jamb harness from repeated door movement
- Corrosion/poor pin contact at the door module connector allowing intermittent comms
- Blown fuse supplying the door module (check fuses for body/door circuits)
- Failed door control module due to water intrusion or electrical surge
- CANH or CANL shorted to power or ground in a door wiring splice
- Missing termination resistor or open termination causing bus reflections
Fault status
Status
Lost Communication With Door Control Module A — no valid CAN messages received from the door control module. Module may be unpowered, disconnected, or the network has an open/short.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
U0199
LAND ROVER
U — Network/User
Lost communication with port control module A
Views:
UK: 9
EN: 45
RU: 12
AI status
Completed
Completed
100%
Causes
- Physical damage or break in the door harness (commonly at door hinge/boot)
- Corroded or loose connector at the door module or body harness
- Blown fuse or missing power/ground to the door control module
- Faulty door control module (internal electronics failure)
- Short or open on the CAN bus (CAN High / CAN Low) or missing bus termination
- Network wiring shorted to battery or ground, or high resistance in the CAN lines
Symptoms
- DTC U0199 stored (Lost Communication With Door Control Module A)
- One or more doors do not lock/unlock with key fob or door switches
- Power windows, mirror adjustments, or interior lights behave intermittently or do not operate
- Door ajar / status message missing or incorrect on dash
- Other modules report additional U-codes related to missing door module
- Chimes, courtesy lights, or alarm functions may not operate for that door
What to check
- Use a scan tool to verify U0199 and check for additional U-codes; confirm if the door control module is listed on the network
- Check battery voltage and main body/door fuses with key on and engine off
- Visually inspect door module connector, pins, and door jamb harness for damage, corrosion, or water intrusion
- Wiggle test wiring in the door hinge area while watching live data/messages for intermittent connection
- Measure CAN bus voltages at a known-good location and at the door module connector (see signal parameters)
- Check CAN bus termination resistance (~60 ohms across CANH and CANL for two 120-ohm terminators in parallel)
Signal parameters
- High-speed CAN idle common-mode: about 2.5 V on both CANH and CANL
- Dominant state: CANH ~3.5 V, CANL ~1.5 V (levels vary by vehicle)
- Bus differential (CANH - CANL) ~0 V (recessive) to ~2.0 V (dominant); verify with oscilloscope if available
- Termination: approx. 60 ohms measured across CANH and CANL at key network points (vehicle dependent)
- Typical baud rates: commonly 500 kb/s or 250 kb/s on high-speed CAN — confirm vehicle specification
- Power supply to module: battery voltage within ~0.5 V of vehicle battery on key-on; ground should be near 0 ohms to chassis
Diagnostic algorithm
- Connect a scan tool and confirm U0199 and any related codes. Record freeze frame / live data and which modules see the door module.
- Check battery voltage and body power fuses related to door electronics. Replace any blown fuses and re-test.
- Visually inspect the door module connector and door jamb harness for damage, corrosion, or pin push-out. Repair or replace damaged connectors.
- With ignition on, check presence of the door module on the network via scan tool. If not present, measure power and ground at the module connector.
- Backprobe CANH and CANL at the module connector and at a known-good network node. Verify idle voltages and differential activity with a multimeter or oscilloscope.
- If CAN signals are absent at the module but present elsewhere, trace wiring between the door module and the main harness (pay attention to the hinge/boot area). Repair any opens/shorts.
- If CAN lines show unexpected voltages (short to Vbatt or ground), isolate and locate the short by disconnecting sections or modules until normal levels return.
- Perform wiggle tests on the harness while monitoring communication to find intermittent faults. Repair broken conductors or replace the harness as needed.
- If wiring and power/grounds are good but the module does not communicate, attempt module reset/reprogramming per manufacturer procedure. If still non-responsive, consider module replacement and programming.
- After repairs, clear codes and perform functional checks of door functions and verify no reoccurrence of U0199.
Likely causes
- Broken conductor in the door jamb harness from repeated door movement
- Corrosion/poor pin contact at the door module connector allowing intermittent comms
- Blown fuse supplying the door module (check fuses for body/door circuits)
- Failed door control module due to water intrusion or electrical surge
- CANH or CANL shorted to power or ground in a door wiring splice
- Missing termination resistor or open termination causing bus reflections
Fault status
Status
Lost Communication With Door Control Module A — no valid CAN messages received from the door control module. Module may be unpowered, disconnected, or the network has an open/short.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
👎 Dislike
0
Send to email