Code
U0230
Generic
U — Network/User
Lost Communication With Rear Gate Module
Views:
UK: 19
EN: 75
RU: 29
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power supply to the rear gate module
- Open, short or high-resistance wiring in CAN/LIN/network lines to the rear gate module
- Poor or missing ground at the rear gate module
- Corroded, loose, or water-damaged connector at the rear gate module
- Damaged or shorted network (CAN/LIN) bus due to chafing, pinched harness, or aftermarket device
- Missing or improper bus termination (open or shorted termination resistors)
Symptoms
- Diagnostic scanner reports U0230 and possibly other U0xxx network codes
- No response from rear gate module in scanner (module not present or no comms)
- Rear gate functions (lock/unlock, motor operation, latch release, courtesy lights) inoperative or intermittent
- Related network functions or other modules reporting communication errors
- Odd/erratic behavior of gate functions or inability to control gate from multiple inputs (switches/key fob)
- Possible intermittent faults when moving gate (open/close)
What to check
- Use a capable scan tool to read all U-codes and confirm U0230; note which network (CAN high-speed, CAN low-speed, LIN) is indicated
- Check for other network-related codes that help isolate bus segment or gateway issues
- Visually inspect rear gate connector(s) and harness for corrosion, water ingress, damaged wires, or pin damage
- Verify relevant fuses and relays for module power (continuous and ignition-switched)
- Measure battery voltage at the module power pin with harness connected and ignition in required state
- Check module ground(s) for continuity to chassis (
Signal parameters
- Battery supply to module: ~12 V nominal (key-dependent supply may be switched)
- Ground continuity:
- CAN recessive voltages: CAN_H ≈2.5 V, CAN_L ≈2.5 V (idle)
- CAN dominant voltages (typical): CAN_H ≈3.5 V, CAN_L ≈1.5 V (during dominant) — differential ≈2 V
- Bus termination: ~60 ohms measured between CAN_H and CAN_L across the entire network
- Oscilloscope: valid CAN frames with expected data rate (e.g., 125/250/500/1000 kbps depending on vehicle) — absence of frames or excessive errors indicates bus fault
Diagnostic algorithm
- Connect a scan tool; record U0230 plus any other network codes and note whether the rear gate module responds to diagnostics.
- Confirm vehicle battery voltage is healthy (≥12.2 V) and that power to the rear gate module is present at the module connector (check fuses/relays first).
- Visually inspect rear gate connector(s) and the flexible harness through the gate pivot. Look for broken wires, chafing, pin corrosion, or water entry. Repair as necessary.
- Verify ground(s): backprobe or disconnect and measure continuity to chassis. Clean and tighten ground connections if high resistance is found.
- With key ON, measure CAN_H and CAN_L at the module connector: verify recessive voltages near 2.5 V and check for proper differential when commands are sent. If voltages are out of range, trace wiring for short to battery or ground.
- With ignition OFF, measure resistance between CAN_H and CAN_L at parked condition; expect approximately 60 ohms across the network. If very high (open) or very low (short), isolate by disconnecting segments/modules to find the abnormal section.
- Use an oscilloscope or CAN bus analyzer to look for valid traffic and CRC errors. If there is no traffic on that segment but other modules on the same bus communicate, suspect an open to the liftgate segment or a failed gateway.
- Perform wiggle/actuate tests of the gate while monitoring communication to reproduce intermittent behavior; secure test leads safely to avoid pinching during motion.
- Disconnect suspected aftermarket devices/trailer adapters and retest communications.
- If wiring, power and ground check good and bus shows proper termination and traffic but the rear gate module does not respond, consider module fault — replace or reprogram per OEM procedure. After repair, clear codes and verify normal operation across several open/close cycles.
- Safety note: avoid pinching test leads when moving the gate; disconnect the battery only if required by vehicle-specific service procedures and follow anti-theft/module programming precautions.
Likely causes
- Fuse or relay for rear gate module supply blown or not energizing
- Corroded/mis-seated connector at tailgate (water intrusion common)
- Broken or chafed CAN or low-speed network wires in the liftgate harness
- Poor ground at module mounting point
- Intermittent failure when gate is opened/closed from flexible harness wear
- Aftermarket trailer harness or accessory loading the network
Fault status
Status
U0230 — Lost Communication With Rear Gate Module. Rear gate module not responding on vehicle network; communication bus or module likely fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U0230
HYUNDAI
U — Network/User
Lost Communication With Rear Gate Module
Views:
UK: 18
EN: 70
RU: 26
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power supply to the rear gate module
- Open, short or high-resistance wiring in CAN/LIN/network lines to the rear gate module
- Poor or missing ground at the rear gate module
- Corroded, loose, or water-damaged connector at the rear gate module
- Damaged or shorted network (CAN/LIN) bus due to chafing, pinched harness, or aftermarket device
- Missing or improper bus termination (open or shorted termination resistors)
Symptoms
- Diagnostic scanner reports U0230 and possibly other U0xxx network codes
- No response from rear gate module in scanner (module not present or no comms)
- Rear gate functions (lock/unlock, motor operation, latch release, courtesy lights) inoperative or intermittent
- Related network functions or other modules reporting communication errors
- Odd/erratic behavior of gate functions or inability to control gate from multiple inputs (switches/key fob)
- Possible intermittent faults when moving gate (open/close)
What to check
- Use a capable scan tool to read all U-codes and confirm U0230; note which network (CAN high-speed, CAN low-speed, LIN) is indicated
- Check for other network-related codes that help isolate bus segment or gateway issues
- Visually inspect rear gate connector(s) and harness for corrosion, water ingress, damaged wires, or pin damage
- Verify relevant fuses and relays for module power (continuous and ignition-switched)
- Measure battery voltage at the module power pin with harness connected and ignition in required state
- Check module ground(s) for continuity to chassis (
Signal parameters
- Battery supply to module: ~12 V nominal (key-dependent supply may be switched)
- Ground continuity:
- CAN recessive voltages: CAN_H ≈2.5 V, CAN_L ≈2.5 V (idle)
- CAN dominant voltages (typical): CAN_H ≈3.5 V, CAN_L ≈1.5 V (during dominant) — differential ≈2 V
- Bus termination: ~60 ohms measured between CAN_H and CAN_L across the entire network
- Oscilloscope: valid CAN frames with expected data rate (e.g., 125/250/500/1000 kbps depending on vehicle) — absence of frames or excessive errors indicates bus fault
Diagnostic algorithm
- Connect a scan tool; record U0230 plus any other network codes and note whether the rear gate module responds to diagnostics.
- Confirm vehicle battery voltage is healthy (≥12.2 V) and that power to the rear gate module is present at the module connector (check fuses/relays first).
- Visually inspect rear gate connector(s) and the flexible harness through the gate pivot. Look for broken wires, chafing, pin corrosion, or water entry. Repair as necessary.
- Verify ground(s): backprobe or disconnect and measure continuity to chassis. Clean and tighten ground connections if high resistance is found.
- With key ON, measure CAN_H and CAN_L at the module connector: verify recessive voltages near 2.5 V and check for proper differential when commands are sent. If voltages are out of range, trace wiring for short to battery or ground.
- With ignition OFF, measure resistance between CAN_H and CAN_L at parked condition; expect approximately 60 ohms across the network. If very high (open) or very low (short), isolate by disconnecting segments/modules to find the abnormal section.
- Use an oscilloscope or CAN bus analyzer to look for valid traffic and CRC errors. If there is no traffic on that segment but other modules on the same bus communicate, suspect an open to the liftgate segment or a failed gateway.
- Perform wiggle/actuate tests of the gate while monitoring communication to reproduce intermittent behavior; secure test leads safely to avoid pinching during motion.
- Disconnect suspected aftermarket devices/trailer adapters and retest communications.
- If wiring, power and ground check good and bus shows proper termination and traffic but the rear gate module does not respond, consider module fault — replace or reprogram per OEM procedure. After repair, clear codes and verify normal operation across several open/close cycles.
- Safety note: avoid pinching test leads when moving the gate; disconnect the battery only if required by vehicle-specific service procedures and follow anti-theft/module programming precautions.
Likely causes
- Fuse or relay for rear gate module supply blown or not energizing
- Corroded/mis-seated connector at tailgate (water intrusion common)
- Broken or chafed CAN or low-speed network wires in the liftgate harness
- Poor ground at module mounting point
- Intermittent failure when gate is opened/closed from flexible harness wear
- Aftermarket trailer harness or accessory loading the network
Fault status
Status
U0230 — Lost Communication With Rear Gate Module. Rear gate module not responding on vehicle network; communication bus or module likely fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
U0230
LAND ROVER
U — Network/User
Lost communication with the rear gate module
Views:
UK: 10
EN: 57
RU: 19
AI status
Completed
Completed
100%
Causes
- Blown fuse or disabled power supply to the rear gate module
- Open, short or high-resistance wiring in CAN/LIN/network lines to the rear gate module
- Poor or missing ground at the rear gate module
- Corroded, loose, or water-damaged connector at the rear gate module
- Damaged or shorted network (CAN/LIN) bus due to chafing, pinched harness, or aftermarket device
- Missing or improper bus termination (open or shorted termination resistors)
Symptoms
- Diagnostic scanner reports U0230 and possibly other U0xxx network codes
- No response from rear gate module in scanner (module not present or no comms)
- Rear gate functions (lock/unlock, motor operation, latch release, courtesy lights) inoperative or intermittent
- Related network functions or other modules reporting communication errors
- Odd/erratic behavior of gate functions or inability to control gate from multiple inputs (switches/key fob)
- Possible intermittent faults when moving gate (open/close)
What to check
- Use a capable scan tool to read all U-codes and confirm U0230; note which network (CAN high-speed, CAN low-speed, LIN) is indicated
- Check for other network-related codes that help isolate bus segment or gateway issues
- Visually inspect rear gate connector(s) and harness for corrosion, water ingress, damaged wires, or pin damage
- Verify relevant fuses and relays for module power (continuous and ignition-switched)
- Measure battery voltage at the module power pin with harness connected and ignition in required state
- Check module ground(s) for continuity to chassis (
Signal parameters
- Battery supply to module: ~12 V nominal (key-dependent supply may be switched)
- Ground continuity:
- CAN recessive voltages: CAN_H ≈2.5 V, CAN_L ≈2.5 V (idle)
- CAN dominant voltages (typical): CAN_H ≈3.5 V, CAN_L ≈1.5 V (during dominant) — differential ≈2 V
- Bus termination: ~60 ohms measured between CAN_H and CAN_L across the entire network
- Oscilloscope: valid CAN frames with expected data rate (e.g., 125/250/500/1000 kbps depending on vehicle) — absence of frames or excessive errors indicates bus fault
Diagnostic algorithm
- Connect a scan tool; record U0230 plus any other network codes and note whether the rear gate module responds to diagnostics.
- Confirm vehicle battery voltage is healthy (≥12.2 V) and that power to the rear gate module is present at the module connector (check fuses/relays first).
- Visually inspect rear gate connector(s) and the flexible harness through the gate pivot. Look for broken wires, chafing, pin corrosion, or water entry. Repair as necessary.
- Verify ground(s): backprobe or disconnect and measure continuity to chassis. Clean and tighten ground connections if high resistance is found.
- With key ON, measure CAN_H and CAN_L at the module connector: verify recessive voltages near 2.5 V and check for proper differential when commands are sent. If voltages are out of range, trace wiring for short to battery or ground.
- With ignition OFF, measure resistance between CAN_H and CAN_L at parked condition; expect approximately 60 ohms across the network. If very high (open) or very low (short), isolate by disconnecting segments/modules to find the abnormal section.
- Use an oscilloscope or CAN bus analyzer to look for valid traffic and CRC errors. If there is no traffic on that segment but other modules on the same bus communicate, suspect an open to the liftgate segment or a failed gateway.
- Perform wiggle/actuate tests of the gate while monitoring communication to reproduce intermittent behavior; secure test leads safely to avoid pinching during motion.
- Disconnect suspected aftermarket devices/trailer adapters and retest communications.
- If wiring, power and ground check good and bus shows proper termination and traffic but the rear gate module does not respond, consider module fault — replace or reprogram per OEM procedure. After repair, clear codes and verify normal operation across several open/close cycles.
- Safety note: avoid pinching test leads when moving the gate; disconnect the battery only if required by vehicle-specific service procedures and follow anti-theft/module programming precautions.
Likely causes
- Fuse or relay for rear gate module supply blown or not energizing
- Corroded/mis-seated connector at tailgate (water intrusion common)
- Broken or chafed CAN or low-speed network wires in the liftgate harness
- Poor ground at module mounting point
- Intermittent failure when gate is opened/closed from flexible harness wear
- Aftermarket trailer harness or accessory loading the network
Fault status
Status
U0230 — Lost Communication With Rear Gate Module. Rear gate module not responding on vehicle network; communication bus or module likely fault.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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