Faulty ignition coil 'L' with an open or shorted secondary winding; Worn or incorrectly gapped spark plug on the affected cylinder; Damaged or corroded ignition coil connector or wiring; Failed ignition coil driver circuit inside the powertrain control module; Moisture or oil intrusion into the spark plug well or coil boot; Aftermarket or incorrect coil installed previously

DTC codes / P23xx · Ignition system and misfire / P2335

P2335Ignition Coil 'L' Secondary Circuit

Q: What does code P2335 mean?

Ignition Coil 'L' Secondary Circuit. P2335 indicates that the powertrain control module has detected a fault in the secondary circuit of ignition coil 'L', which is the high-voltage side that fires the spark plug. The computer monitors the coil's secondary winding for expected electrical behavior and sets this code when the signal is out of range, often due to an open or shorted winding or a faulty spark plug.

P2335 indicates that the powertrain control module has detected a fault in the secondary circuit of ignition coil 'L', which is the high-voltage side that fires the spark plug. The computer monitors the coil's secondary winding for expected electrical behavior and sets this code when the signal is out of range, often due to an open or shorted winding or a faulty spark plug.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Engine misfire or rough running, especially under load or acceleration
Reduced engine power or limp mode in some vehicles
Shaking or vibration felt through the steering wheel or seat
Worsened fuel economy due to incomplete combustion
Difficulty starting or intermittent stalling in severe cases

Common causes, most likely first

Faulty ignition coil 'L' with an open or shorted secondary winding
Worn or incorrectly gapped spark plug on the affected cylinder
Damaged or corroded ignition coil connector or wiring
Failed ignition coil driver circuit inside the powertrain control module
Moisture or oil intrusion into the spark plug well or coil boot
Aftermarket or incorrect coil installed previously

How to diagnose and fix it

Perform a visual inspection of coil 'L', its connector, and the spark plug well for damage, corrosion, or oil contamination
Swap coil 'L' with a known-good coil from another cylinder and see if the misfire or code moves, confirming a coil fault
Remove and inspect the spark plug for wear, incorrect gap, or fouling, and replace if necessary
Use a multimeter to check the secondary resistance of coil 'L' against the manufacturer's specification
Check for battery voltage and ground at the coil connector with the key on, and inspect the driver signal wire for continuity
If the coil and wiring test good, perform a cylinder balance or compression test to rule out mechanical issues
Replace the faulty ignition coil and clear the code, then verify the repair with a test drive

Why coil L fails without warning

A failing coil boot or spark plug tube seal can allow oil to pool around the spark plug, causing secondary circuit faults that mimic a bad coil.
The secondary circuit can test fine with a multimeter yet still break down under high load, so a swap test is often more reliable than a resistance check alone.
P2335 is sometimes set by a loose or damaged ground strap on the engine, which affects all coils but may trigger only one coil code first.
A misfire from a bad coil can damage the catalytic converter over time, so ignoring the code risks a much more expensive repair.
Some vehicles require a relearn or adaptive memory reset after coil replacement to fully restore smooth operation.

Can I keep driving with P2335?

It is generally safe to drive short distances to a repair shop, but avoid heavy acceleration or towing because a persistent misfire can overheat and damage the catalytic converter. If the check engine light is flashing, stop driving immediately and have the vehicle towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.