U0150

Code

HYUNDAI U — Network/User

Lost Communication With Gateway “E”

Brand: HYUNDAI

Type: U — Network/User

Views: UK: 12 EN: 24 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

One or more vehicle systems inoperative (e.g., door modules, instrument cluster, climate control depending on network)
Multiple related body-control DTCs present
Warning lights illuminated (network communication or system-specific)
Remote/keyless or immobilizer issues if routed through that gateway
Intermittent operation of affected functions

Connect a manufacturer-level scan tool and read all U and module communication codes and module presence on each network
Record freeze-frame or stored data showing when code set and which modules unavailable
Check battery voltage and measure at gateway power and ground pins with engine off and cranking
Inspect gateway connector for bent pins, corrosion, water intrusion, or damage
Verify fuses and relays that feed the gateway and associated networks
Backprobe CAN_H and CAN_L at the gateway and at a known-good module to compare signals

CAN bus idle voltages: CAN_H ≈ 2.5 V (recessive), CAN_L ≈ 2.5 V (recessive); dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (values may vary by vehicle)
Bus termination: approx. 60 ohms across CAN_H and CAN_L (two 120 ohm terminators)
Presence/heartbeat messages: expected periodic frames from gateway (check with OEM data list)
Bus data rate: commonly 500 kbps, 250 kbps, or CAN-FD rates — confirm OEM network speed
Module response to UDS/ISO-TP diagnostic requests: gateway should reply to diagnostic identifier queries

Use a dealer or manufacturer-level scan tool. Confirm U0150 and list other network U-codes or missing modules. Note the exact network/gateway name.
Verify battery voltage is within specification. Check for recent low-voltage events and reconnect battery if necessary. Clear codes and attempt to reproduce.
Visually inspect the gateway and harness. Look for water entry, corrosion, crushed wiring, or recent repairs in the area.
Verify power and ground at the gateway connector (with harness connected). Check fuses/relays that feed the gateway circuit and replace if blown.
With an oscilloscope or CAN bus tester, probe CAN_H and CAN_L at the gateway connector and a known-good node. Confirm proper idle voltages, differential signals, termination, and presence of data frames.
If CAN lines are silent at the gateway but present elsewhere, trace wiring between gateway and the next network node for opens/shorts, repair as required.
If CAN frames are present but gateway does not respond to diagnostic requests, attempt wakeup procedures per OEM tool. Reflash or reprogram gateway only if confirmed necessary and supported.
If wiring and power/ground are good and the gateway remains unresponsive, replace the gateway module and reprogram/configure using OEM procedures. Retest and clear codes.
After repair, verify all related modules appear on the network and perform full system function checks. Monitor for reoccurrence.

Loose or corroded connector at the gateway module
Power or ground supply missing at the gateway (fuse, relay, battery connection)
Shorted CAN_H or CAN_L to ground/voltage or between each other on the gateway side
Gateway module internal fault (hardware or firmware) after wiring checks
Module lost after recent service, module replacement, or BMS disconnect (programming needed)

⚠️ Status

Lost Communication With Gateway "E" — Gateway module not responding on the vehicle network. Related modules may be unavailable.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-4.0 hours

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U0150 — Lost Communication With Gateway “E”