Code
U0205
Generic
U — Network/User
Lost Communication With Door Control Module G
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module G (internal failure or corrupted software)
- Open, short or high-resistance wiring on CAN/LIN/data lines to the module
- Loss of module supply (fuse, battery feed, ignition-switched power)
- Poor or missing ground at the module
- Connector corrosion, bent pins, water intrusion or mechanical damage
- CAN bus termination or wiring fault (short to battery/ground, open circuit)
Symptoms
- Inoperative door functions (locks, power windows, mirror folding) on the affected door(s)
- Door-related warnings/information messages on instrument cluster or infotainment
- Chimes, incorrect door-ajar indications or inability to lock/unlock
- Related modules showing communication errors or fallback behavior
- Intermittent operation or total loss of the affected door subsystem
What to check
- Use a scan tool to read U0205 and any related network codes; note if the module appears on the network list
- Check vehicle battery voltage and main power fuses for door module circuits
- Visually inspect door module connectors and wiring for corrosion, water, damage or pin issues
- Backprobe module power and ground pins; verify stable battery voltage and a good ground
- Inspect CAN (and LIN if present) wiring for chafing, kinks, or recent body/door repairs
- Check for CAN bus termination resistance across CAN_H and CAN_L (approx. 60 ohms total)
Signal parameters
- CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
- CAN dominant approx: CAN_H ≈ 3.5–3.9 V, CAN_L ≈ 0.9–1.5 V (differential ≈ 2.0–2.5 V)
- Typical bus termination resistance: ~60 ohms between CAN_H and CAN_L (two 120Ω terminators in parallel)
- Expected periodic 'heartbeat' from door module: typically transmitted every 100–1000 ms (varies by manufacturer)
- Logical data: module should appear in network node list and respond to diagnostic addressing/requests
Diagnostic algorithm
- Connect a diagnostic scan tool and confirm U0205 and any other network DTCs; record freeze frame/live data.
- Verify the module is listed on the network via the scan tool; attempt to communicate/identify the module.
- Check vehicle battery voltage and inspect/replace related fuses; ensure ignition power circuits are present at module pins.
- Inspect connector and harness at the door control module for corrosion, water, bent pins or damage; repair as required.
- Backprobe module power and ground pins; confirm stable battery voltage (with ignition state per wiring diagram) and good chassis/return ground.
- Measure termination resistance across CAN_H and CAN_L at multiple points; expect ≈60Ω total. Look for opens or extra resistances.
- Use a lab scope or CAN analyzer on CAN_H and CAN_L to verify idle voltages, message activity, and to identify bus errors or a stuck-dominant node.
- Isolate the suspected circuit: disconnect the door module and confirm whether the rest of the bus returns to normal (or vice versa) to locate a faulty node or short.
- If wiring and supply/ground are correct but no communication, attempt a module wake/reflash per manufacturer procedure; reprogram or update software if required.
- Replace the Door Control Module G only after confirming wiring/power/ground are good and the module is non-responsive; re-initialize and perform post-repair verification.
- Clear codes and road-test to confirm the fault does not return; re-scan for any new or persistent network errors.
Likely causes
- Blown fuse or lost power/ground to Door Control Module G
- Damaged or corroded connector at the door module (water intrusion common)
- Broken or shorted CAN bus wiring between the module and gateway/BCM
- Module failure (non-responsive following power and wiring checks)
Fault status
Status
Lost Communication With Door Control Module G — module not responding on vehicle network. Check power, ground, connectors, and CAN/LIN wiring; may be intermittent or permanent.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U0205
HYUNDAI
U — Network/User
Lost Communication With “Door Control Module G”
AI status
Completed
Completed
100%
Causes
- Faulty Door Control Module G (internal failure or corrupted software)
- Open, short or high-resistance wiring on CAN/LIN/data lines to the module
- Loss of module supply (fuse, battery feed, ignition-switched power)
- Poor or missing ground at the module
- Connector corrosion, bent pins, water intrusion or mechanical damage
- CAN bus termination or wiring fault (short to battery/ground, open circuit)
Symptoms
- Inoperative door functions (locks, power windows, mirror folding) on the affected door(s)
- Door-related warnings/information messages on instrument cluster or infotainment
- Chimes, incorrect door-ajar indications or inability to lock/unlock
- Related modules showing communication errors or fallback behavior
- Intermittent operation or total loss of the affected door subsystem
What to check
- Use a scan tool to read U0205 and any related network codes; note if the module appears on the network list
- Check vehicle battery voltage and main power fuses for door module circuits
- Visually inspect door module connectors and wiring for corrosion, water, damage or pin issues
- Backprobe module power and ground pins; verify stable battery voltage and a good ground
- Inspect CAN (and LIN if present) wiring for chafing, kinks, or recent body/door repairs
- Check for CAN bus termination resistance across CAN_H and CAN_L (approx. 60 ohms total)
Signal parameters
- CAN idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
- CAN dominant approx: CAN_H ≈ 3.5–3.9 V, CAN_L ≈ 0.9–1.5 V (differential ≈ 2.0–2.5 V)
- Typical bus termination resistance: ~60 ohms between CAN_H and CAN_L (two 120Ω terminators in parallel)
- Expected periodic 'heartbeat' from door module: typically transmitted every 100–1000 ms (varies by manufacturer)
- Logical data: module should appear in network node list and respond to diagnostic addressing/requests
Diagnostic algorithm
- Connect a diagnostic scan tool and confirm U0205 and any other network DTCs; record freeze frame/live data.
- Verify the module is listed on the network via the scan tool; attempt to communicate/identify the module.
- Check vehicle battery voltage and inspect/replace related fuses; ensure ignition power circuits are present at module pins.
- Inspect connector and harness at the door control module for corrosion, water, bent pins or damage; repair as required.
- Backprobe module power and ground pins; confirm stable battery voltage (with ignition state per wiring diagram) and good chassis/return ground.
- Measure termination resistance across CAN_H and CAN_L at multiple points; expect ≈60Ω total. Look for opens or extra resistances.
- Use a lab scope or CAN analyzer on CAN_H and CAN_L to verify idle voltages, message activity, and to identify bus errors or a stuck-dominant node.
- Isolate the suspected circuit: disconnect the door module and confirm whether the rest of the bus returns to normal (or vice versa) to locate a faulty node or short.
- If wiring and supply/ground are correct but no communication, attempt a module wake/reflash per manufacturer procedure; reprogram or update software if required.
- Replace the Door Control Module G only after confirming wiring/power/ground are good and the module is non-responsive; re-initialize and perform post-repair verification.
- Clear codes and road-test to confirm the fault does not return; re-scan for any new or persistent network errors.
Likely causes
- Blown fuse or lost power/ground to Door Control Module G
- Damaged or corroded connector at the door module (water intrusion common)
- Broken or shorted CAN bus wiring between the module and gateway/BCM
- Module failure (non-responsive following power and wiring checks)
Fault status
Status
Lost Communication With Door Control Module G — module not responding on vehicle network. Check power, ground, connectors, and CAN/LIN wiring; may be intermittent or permanent.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
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