What it means
The primary control circuit of ignition coil K reads a voltage below the expected level — usually a short to ground on the primary driver wire or a low-resistance fault in the coil primary winding. Coil K cannot build a normal charge, so the cylinder it fires misfires, especially under load. Causes: short to ground in the primary wiring, an internal coil primary fault, or a faulty ECU/igniter driver.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Ignition coil K is the coil identified by the vehicle’s control system for one cylinder; its primary circuit carries low-voltage current to build the magnetic field that produces spark. The engine computer monitors the electrical response of this control circuit. It sets P2330 when coil K’s primary control voltage is lower than expected, commonly because the wire is shorted to ground or the coil primary has an electrical fault.
Common causes
Most likely first.
- Primary winding shorted to ground or harness chafed
- Coil K internal driver fault
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Engine misfire or rough running
- Reduced power or hesitation
How to diagnose it
- Save freeze-frame data and check misfire counts to identify when the cylinder served by coil K begins misfiring.
- With the ignition off, inspect coil K’s connector and wiring for chafing, a wire touching ground, corrosion, or a loose terminal.
- Check coil K’s primary winding and connector for a short or resistance outside the manufacturer’s specification.
- With the circuit isolated as directed by service information, check the primary control wire for continuity and an unintended short to ground.
- If the coil and wiring pass, test the control signal and engine computer driver using the manufacturer’s circuit procedure.
Common fixes
- Reconnect coil K’s loose plug and clean or repair corroded terminals.
- Repair insulation damage or a short to ground in coil K’s primary control wiring.
- Replace coil K if its primary winding fails the specified test.
- Repair or replace the engine computer driver only after the coil and wiring have been verified.
Can I keep driving?
Avoid hard acceleration and stop driving if the engine runs very rough or the check-engine light flashes; an active misfire can overheat and damage the catalytic converter. Arrange prompt repair if the misfire persists.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.