What Does P1325 Mean?
P1325 indicates a malfunction in the igniter circuit for cylinder number 6. The ECM has detected an abnormal feedback signal from the No. 6 igniter power transistor, meaning spark delivery on cylinder 6 is unreliable. This results in misfires on cylinder 6 and potential catalyst damage if unaddressed.
Common Causes
35%
Failed igniter (power transistor) for cylinder 6
30%
Defective ignition coil on cylinder 6
20%
Corroded or heat-damaged wiring/connector in the igniter circuit
10%
Poor ground at the igniter module
5%
ECM igniter driver failure for cylinder 6
Diagnostic Steps
1
Inspect the cylinder 6 ignition coil connector and igniter wiring for signs of heat damage, corrosion, or looseness.
2
Swap the cylinder 6 ignition coil with a known-good coil from another cylinder, clear codes, and test drive to determine if the fault follows the coil.
3
Measure the ignition coil primary and secondary winding resistance for cylinder 6 against manufacturer specifications.
4
Verify the igniter module has proper power supply voltage and ground continuity.
5
Use an oscilloscope on the ECM-to-igniter trigger line for cylinder 6 to confirm a clean trigger signal is being sent.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
P1325 indicates a malfunction in the igniter circuit for cylinder number 6. The ECM has detected an abnormal feedback signal from the No. 6 igniter power transistor, meaning spark delivery on cylinder 6 is unreliable. This results in misfires on cylinder 6 and potential catalyst damage if unaddresse...
The most common cause of P1325 (Igniter Circuit Malfunction (No. 6)) is: Failed igniter (power transistor) for cylinder 6
Typical repair costs for P1325 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A cylinder 6 misfire causes rough running and dumps unburned fuel into the exhaust. This heats the catalytic converter excessively and can create a fire risk under sustained driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1325 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
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Manufacturer
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