U0426Network Communication

Invalid Data Received From Vehicle Immobilizer Control Module

U0426 means a module received invalid or implausible data from the vehicle immobilizer (anti-theft) control module. The security system may prevent normal starting.

🚗 Often not. If the immobilizer sends invalid data, the engine may not start or may stall.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Immobilizer module software or internal fault$200-$800

30%

A fault or outdated software can cause invalid data to be sent.

#2Key or transponder problems$100-$400

25%

A faulty key or antenna can lead to invalid immobilizer data.

#3Wiring or connector problems$50-$400

25%

Poor connections corrupt transmitted data.

#4Bus interference or grounding issues$50-$300

20%

Network noise or bad grounds corrupt data.

🩺 Common Symptoms

No-start or hard start
Security or anti-theft light on
Key not recognized
Engine stalls after starting

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$200-$900

📋 Free OBD2 Code Cheat Sheet

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

🔧 How to Diagnose U0426

1Scan for all stored codes including immobilizer faults

2Check module software and update if needed

3Inspect wiring, connectors, and grounds

4Verify key and transponder function

❓ Frequently Asked Questions

Can I drive with U0426?

Often not. The immobilizer may prevent starting or cause stalling. Diagnose it first.

What sends this invalid data?

The immobilizer control module is broadcasting values that are out of range or implausible.

What causes U0426?

An immobilizer fault, key or transponder problems, or wiring issues corrupting the data.

🔗 Related Codes

U0168U0155B1601B1602