What Does P1330 Mean?
P1330 indicates a malfunction in the igniter circuit for cylinder 7, typically found on engines with 8 or more cylinders. The igniter is the power transistor that drives the ignition coil, and this fault means the ECU cannot properly control spark delivery to cylinder 7. This will cause a misfire on that cylinder, resulting in rough running, power loss, and increased emissions.
Safety Warning
Cylinder 7 misfire causes power loss and rough running. Unburned fuel can overheat and damage the catalytic converter. Extended driving is not recommended.
Common Causes
35%
Failed igniter module for cylinder 7
25%
Damaged or corroded wiring/connector to the igniter circuit
20%
Faulty ignition coil on cylinder 7
12%
ECU igniter driver circuit failure
8%
Poor ground connection at igniter module
Diagnostic Steps
1
Read freeze frame data and note engine conditions when the fault set. Check for companion misfire codes on cylinder 7.
2
Inspect the igniter module connector and wiring harness for cylinder 7. Look for corrosion, bent pins, chafed wires, or heat damage.
3
Measure resistance of the ignition coil primary and secondary windings for cylinder 7 and compare to specifications.
4
Using a multimeter, check for battery voltage supply and ground at the igniter connector with key on.
5
If wiring and coil are good, swap the igniter module with a known-good cylinder and retest to confirm the igniter is the faulty component.
6
If the fault follows the igniter, replace it. If the fault stays on cylinder 7, suspect ECU driver circuit failure.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
P1330 indicates a malfunction in the igniter circuit for cylinder 7, typically found on engines with 8 or more cylinders. The igniter is the power transistor that drives the ignition coil, and this fault means the ECU cannot properly control spark delivery to cylinder 7. This will cause a misfire on...
The most common cause of P1330 (Igniter Circuit Malfunction (No. 7)) is: Failed igniter module for cylinder 7
Typical repair costs for P1330 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cylinder 7 misfire causes power loss and rough running. Unburned fuel can overheat and damage the catalytic converter. Extended driving is not recommended.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1330 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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