P038B — Ignition I Control Signal Circuit Low

What Does P038B Mean?

P038B is a diagnostic trouble code indicating: Ignition I Control Signal Circuit Low. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P038B

⚠️ Check Engine Light (MIL) illuminated
⚠️ Ignition I Control Signal reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Engine misfires or rough running

Common Causes

🔍 Open or broken wire in Ignition I Control Signal circuit
🔍 Poor ground connection at Ignition I Control Signal
🔍 Faulty Ignition I Control Signal with no output signal
🔍 Disconnected or loose Ignition I Control Signal connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P038B mean?

P038B indicates: Ignition I Control Signal Circuit Low. The vehicle's computer has detected that the Ignition I Control Signal is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P038B?

Only short distances if absolutely necessary. P038B affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P038B?

Repair costs for P038B typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Ignition I Control Signal circuit
🔧 Clean and secure Ignition I Control Signal connector and ground points
🔧 Replace failed Ignition I Control Signal

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P038B: Ignition I Control Signal Circuit Low