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

BUICK CADILLAC CHEVY CHRYSLER GM GMC OLDSMOBILE SATURN
Severity
Low
System
Manufacturer-Specific Powertrain
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

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

Common Causes

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. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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