Code
U0149
Generic
U — Network/User
Lost Communication With Serial Data Gateway Module D
Views:
UK: 16
EN: 26
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or short in the gateway module power or ground circuit
- Damaged, corroded, or loose connector at the gateway or adjacent modules
- Faulty Serial Data Gateway Module D (internal failure)
- CAN/serial bus wiring damage or pinched harness
- Missing or faulty termination on the CAN/serial network
- Low battery or insufficient supply voltage during communication
Symptoms
- MIL (Check Engine) or network warning indicator illuminated
- Loss or malfunction of functions controlled through Gateway D (infotainment, telematics, body features depending on vehicle)
- One or more modules not present/listed in the scan tool network view
- Intermittent or permanent communication faults on related networks
- Some vehicle features may be disabled or show error messages
What to check
- Record all current and pending DTCs and freeze frame data with a scan tool
- Check battery voltage (key on and cranking) and system supply ≈12.0–14.5 V
- Inspect fuses and fusible links related to gateway power circuits
- Visually inspect gateway connectors and surrounding harness for damage, corrosion, pin push-out, or water intrusion
- Verify good ground(s) at module body/chassis ground points
- Use a scan tool to see if Gateway D is present and to view network nodes and message traffic
Signal parameters
- Module supply voltage: ~11–14.5 V with ignition ON (varies by vehicle)
- Module ground near 0 V (low resistance to chassis)
- CAN bus idle voltages (typical): CANH ≈2.5–3.5 V, CANL ≈1.5–2.5 V (vehicle-dependent)
- Dominant state differential voltage on CAN typically ~1.5–3.5 V when active
- Gateway heartbeat/“alive” messages should appear at a regular interval (commonly 100–1000 ms depending on network)
- Expected presence of adjacent module messages when vehicle is in the correct ignition state
Diagnostic algorithm
- Connect a full-function scan tool and read all stored, pending and history DTCs; note any other U-codes.
- Confirm battery condition and system voltage. Recharge or load-test battery if low.
- Inspect and verify fuses and relay circuits that supply Gateway Module D.
- Visually inspect gateway connector and harness; disconnect and check for bent pins, corrosion, pushed-out terminals, or foreign material.
- Verify good module ground(s) with low-resistance measurement to chassis.
- With ignition ON, use a scan tool to check if Gateway D appears and whether it transmits/receives. Note module IDs and missing nodes.
Likely causes
- Loss of module supply voltage or bad ground to Gateway Module D
- Corroded/loose connector or pin at the gateway or bus splice
- Damaged CAN/serial wiring (short to ground/voltage or open)
- Faulty gateway module hardware or failed transceiver
- Blown fuse or removed/disabled circuit powering the gateway
Fault status
Status
Lost communication with Serial Data Gateway Module D — the module failed to respond on its serial/CAN network segment. Check power, ground, connectors, harness integrity and bus signals; intermittent faults may set the code.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U0149
HYUNDAI
U — Network/User
Lost Communication With Gateway “D”
Views:
UK: 16
EN: 27
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or short in the gateway module power or ground circuit
- Damaged, corroded, or loose connector at the gateway or adjacent modules
- Faulty Serial Data Gateway Module D (internal failure)
- CAN/serial bus wiring damage or pinched harness
- Missing or faulty termination on the CAN/serial network
- Low battery or insufficient supply voltage during communication
Symptoms
- MIL (Check Engine) or network warning indicator illuminated
- Loss or malfunction of functions controlled through Gateway D (infotainment, telematics, body features depending on vehicle)
- One or more modules not present/listed in the scan tool network view
- Intermittent or permanent communication faults on related networks
- Some vehicle features may be disabled or show error messages
What to check
- Record all current and pending DTCs and freeze frame data with a scan tool
- Check battery voltage (key on and cranking) and system supply ≈12.0–14.5 V
- Inspect fuses and fusible links related to gateway power circuits
- Visually inspect gateway connectors and surrounding harness for damage, corrosion, pin push-out, or water intrusion
- Verify good ground(s) at module body/chassis ground points
- Use a scan tool to see if Gateway D is present and to view network nodes and message traffic
Signal parameters
- Module supply voltage: ~11–14.5 V with ignition ON (varies by vehicle)
- Module ground near 0 V (low resistance to chassis)
- CAN bus idle voltages (typical): CANH ≈2.5–3.5 V, CANL ≈1.5–2.5 V (vehicle-dependent)
- Dominant state differential voltage on CAN typically ~1.5–3.5 V when active
- Gateway heartbeat/“alive” messages should appear at a regular interval (commonly 100–1000 ms depending on network)
- Expected presence of adjacent module messages when vehicle is in the correct ignition state
Diagnostic algorithm
- Connect a full-function scan tool and read all stored, pending and history DTCs; note any other U-codes.
- Confirm battery condition and system voltage. Recharge or load-test battery if low.
- Inspect and verify fuses and relay circuits that supply Gateway Module D.
- Visually inspect gateway connector and harness; disconnect and check for bent pins, corrosion, pushed-out terminals, or foreign material.
- Verify good module ground(s) with low-resistance measurement to chassis.
- With ignition ON, use a scan tool to check if Gateway D appears and whether it transmits/receives. Note module IDs and missing nodes.
Likely causes
- Loss of module supply voltage or bad ground to Gateway Module D
- Corroded/loose connector or pin at the gateway or bus splice
- Damaged CAN/serial wiring (short to ground/voltage or open)
- Faulty gateway module hardware or failed transceiver
- Blown fuse or removed/disabled circuit powering the gateway
Fault status
Status
Lost communication with Serial Data Gateway Module D — the module failed to respond on its serial/CAN network segment. Check power, ground, connectors, harness integrity and bus signals; intermittent faults may set the code.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 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
0
👎 Dislike
0
Send to email