P1320

Ignition Signal Primary Circuit Malfunction

Q: What does fault code P1320 mean?

Ignition Signal Primary Circuit Malfunction. Nissan/Infiniti-specific code for the primary ignition signal circuit between the ECM and ignition coil(s).

Q: What are the symptoms of P1320?

Misfire symptoms; Rough idle; CEL, possibly flashing if severe

Q: What are the possible causes of P1320?

Faulty ignition coil; Wiring/connector issue; Faulty ECM driver circuit (less common)

Q: How to fix P1320?

Test coil primary resistance; Inspect wiring and connectors; Replace faulty coil; Verify ECM driver if coils test fine

Severity: High Ignition System Nissan Specific Est. Repair: $100 - $350

High severity. Avoid long drives and get diagnosed as soon as possible. Flashing check engine light = stop driving if safe.

Quick Answer

P1320 means “Ignition Signal Primary Circuit Malfunction.” Severity: High. Estimated repair cost: $100 - $350. Most common sign: Misfire symptoms.

What Does P1320 Mean?

Nissan/Infiniti-specific code for the primary ignition signal circuit between the ECM and ignition coil(s).

Common Symptoms

Misfire symptoms

Rough idle

CEL, possibly flashing if severe

Possible Causes

Faulty ignition coil

Wiring/connector issue

Faulty ECM driver circuit (less common)

How to Fix P1320 – Repair Guide

Test coil primary resistance

Inspect wiring and connectors

Replace faulty coil

Verify ECM driver if coils test fine

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Budgeting for This Repair?

A typical P1320 repair runs about $100 - $350. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.