B1004Body / Restraints

Control Module Internal Fault (Restraints)

B1004 indicates an internal control module fault, commonly in the restraint (airbag) system. The module detected a problem within itself that can affect safety functions.

🚗 Not recommended. An internal restraint module fault can disable airbag protection.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Internal control module failure$300-$900

40%

An internal hardware or logic fault may require module replacement.

#2Poor power or ground to the module$50-$300

25%

Weak power or ground can cause internal fault detection.

#3Software or configuration issue$100-$400

20%

Corrupt or incorrect software can trigger the fault.

#4Wiring or connector problems$50-$300

15%

Poor connections can cause module faults.

🩺 Common Symptoms

Airbag warning light
Restraint features disabled
Related airbag codes
Fault message in the cluster

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$300

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 B1004

1Confirm which module set B1004

2Verify power and grounds to that module

3Check for software updates or reconfiguration

4Inspect wiring and connectors, then retest

❓ Frequently Asked Questions

Can I drive with B1004?

It is not recommended. An internal restraint module fault can disable airbag protection. Diagnose it promptly.

What does B1004 mean?

A control module, often the airbag module, reported an internal fault that can affect safety functions.

What causes B1004?

An internal module failure, power and ground issues, software problems, or wiring faults.

🔗 Related Codes

B1000B1007B0081B1015