P1320 on 2022-2024 Infiniti QX55 (PURE, LUXE, ESSENTIAL, SENSORY) — Ignition Signal Primary Circuit Malfunction
1 vehicles · 1 makes
Most Reported On
P1320 is an OBD-II diagnostic trouble code meaning “Ignition Signal Primary Circuit Malfunction.” Manufacturer-specific powertrain code used by Nissan and Infiniti. The ECM monitors the primary (low-voltage) side of the ignition coil circuits that trigger spark, and sets this code when the ignition primary signal is not returned to the ECM during cranking or running. On many Nissan engines the power transistor that switches the coil is built into the coil-on-plug assembly, so a failed coil often sets this code. Expect misfires, rough idle, hesitation, and in bad cases a flashing check engine light - a flashing light means stop driving, as raw fuel can destroy the catalytic converter. This code is most commonly reported on 2022-2024 Infiniti QX55 (PURE, LUXE, ESSENTIAL, SENSORY).
Common Causes
Diagnostic Tools
P1320 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1320 mean?
P1320 stands for "Ignition Signal Primary Circuit Malfunction." Manufacturer-specific powertrain code used by Nissan and Infiniti. The ECM monitors the primary (low-voltage) side of the ignition coil circuits that trigger spark, and sets this code when the ignition primary signal is not returned to the ECM during cranking or running. On many Nissan engines the power transistor that switches the coil is built into the coil-on-plug assembly, so a failed coil often sets this code. Expect misfires, rough idle, hesitation, and in bad cases a flashing check engine light - a flashing light means stop driving, as raw fuel can destroy the catalytic converter.
What are the most common causes of P1320?
The most common causes of P1320 are: Failed ignition coil / integrated power transistor (a very common Nissan failure, often one coil at a time), Worn or fouled spark plugs overstressing the coils, Open, shorted, or chafed wiring in the ignition primary circuit, Poor connection or corrosion at an ignition coil connector, Crankshaft or camshaft position sensor fault disrupting the ignition trigger signal, ECM fault (rare - rule out coils and wiring first). The specific cause varies by vehicle.
How much does it cost to fix P1320?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P1320?
Au7o has documented P1320 across 1 vehicle models from 1 manufacturers: Infiniti.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.