P1320 — IC Module 4X Ref Circuit Intermittent, No Pulses

What Does P1320 Mean?

P1320 is a manufacturer-specific diagnostic trouble code: IC Module 4X Ref Circuit Intermittent, No Pulses. This code applies to BUICK, CADILLAC, CHEVY, CHRYSLER, GM vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1320

⚠️ Check Engine Light (MIL) illuminated
⚠️ IC Module 4X Ref signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at IC Module 4X Ref
🔍 Wire chafing causing intermittent contact
🔍 IC Module 4X Ref failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P1320 mean?

P1320 indicates: IC Module 4X Ref Circuit Intermittent, No Pulses. The vehicle's computer has detected that the IC Module 4X Ref is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1320?

Yes, P1320 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P1320?

Repair costs for P1320 typically range from $30 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

🔧 Inspect and reseat all IC Module 4X Ref connectors
🔧 Repair chafed or damaged wiring in IC Module 4X Ref circuit
🔧 Replace IC Module 4X Ref if failing intermittently

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.

P1320: IC Module 4X Ref Circuit Intermittent, No Pulses