U0146Network Communication

Lost Communication With Gateway A

U0146 means a module has lost communication with the gateway module over the CAN bus. The gateway bridges different vehicle networks. It usually points to a wiring, power, ground, or connector fault.

🚗 Not recommended. The gateway routes data between networks, so losing it can knock out many modules at once.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring, connector, or CAN bus fault$50-$500

45%

Damaged or corroded wiring at the gateway.

#2Power or ground fault$50-$400

30%

Blown fuse or poor ground at the gateway.

#3Failed gateway module$300-$1200

15%

The gateway module itself has failed.

🩺 Common Symptoms

Multiple modules not communicating
Widespread warning lights
No communication with scan tool on some networks
Erratic behavior
Other U-codes stored

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$1000

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0146

1Check gateway fuses, power, and grounds first

2Inspect CAN wiring and connectors at the gateway

3Scan all networks for communication problems

4Back-probe the buses for correct signal

❓ Frequently Asked Questions

Can I drive with U0146?

Not safely. The gateway connects vehicle networks, so its loss can disable many systems. Diagnose it first.

What causes U0146?

Wiring, connector, or power/ground faults at the gateway, most often.

What does the gateway module do?

It routes data between separate vehicle networks. When it fails, modules on different buses can no longer talk to each other.

🔗 Related Codes

U0100U0140U0155U0121