P1320Ignition System

Ignition Signal Primary Circuit (Nissan/Infiniti)

P1320 is a Nissan/Infiniti code for an ignition signal primary circuit fault. The ECM detected a problem with the ignition primary signal, often from a failing coil or the power transistor inside a coil-on-plug.

🚗 Use caution. Ignition faults can cause misfire, stalling, and no-start.
HIGH
severity
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🎯 Top Causes, Ranked by Likelihood

#1Failing ignition coil$50-$400
45%
A bad coil-on-plug or its internal transistor disrupts the primary signal.
#2Spark plug or wiring fault$30-$300
30%
Worn plugs or damaged wiring cause misfire and signal faults.
#3ECM or connector issue$50-$500
25%
A connector or ECM driver fault affects the ignition signal.

🩺 Common Symptoms

💰 Repair Cost: DIY vs Shop

DIY Cost
$30-$400
Shop Cost
$150-$600

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P1320

1Inspect ignition coils and spark plugs
2Test coil primary circuit operation
3Check wiring and connectors to the coils
4Replace faulty coils or plugs

❓ Frequently Asked Questions

Can I drive with P1320?
With caution. Ignition primary faults can cause misfire, stalling, and no-start. Diagnose promptly.
Is P1320 a Nissan code?
Yes, P1320 is a Nissan/Infiniti ignition signal primary circuit code.
What causes P1320?
A failing ignition coil, worn plugs or wiring, or an ECM/connector fault are common causes.

🔗 Related Codes

P0300P0351P0352
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