What Does P1305 Mean?
P1305 signals a malfunction in the igniter circuit for Bank 2 or the number 2 ignition coil. The igniter is the power transistor that switches the primary coil current on and off to generate spark. When the ECM detects an abnormal signal from this circuit, it sets this code, which typically results in a misfire on the affected cylinder.
Common Causes
35%
Failed igniter (power transistor) module
30%
Defective ignition coil on cylinder 2 or Bank 2
20%
Damaged or corroded wiring/connectors in the igniter circuit
10%
Poor ground connection at the igniter module
5%
ECM igniter driver circuit failure
Diagnostic Steps
1
Inspect the igniter module connector and wiring for corrosion, broken pins, or heat damage.
2
Measure resistance of the ignition coil primary and secondary windings against manufacturer specifications.
3
Check for proper power supply voltage and ground at the igniter module connector with key on.
4
Swap the suspected ignition coil with a known-good coil from another cylinder and see if the fault follows.
5
Use an oscilloscope to verify the ECM is sending the correct ignition trigger signal to the igniter.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
P1305 signals a malfunction in the igniter circuit for Bank 2 or the number 2 ignition coil. The igniter is the power transistor that switches the primary coil current on and off to generate spark. When the ECM detects an abnormal signal from this circuit, it sets this code, which typically results ...
The most common cause of P1305 (Igniter Circuit Malfunction, (Bank 2 Or No. 2)) is: Failed igniter (power transistor) module
Typical repair costs for P1305 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A misfiring cylinder causes loss of power and can dump unburned fuel into the catalytic converter, potentially causing converter overheating and fire risk. Avoid sustained high-load driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1305 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
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