The P2335: Ignition Coil ‘L’ Secondary Circuit code indicates an issue with the secondary circuit of Ignition Coil ‘L’. The secondary circuit is responsible for delivering the high voltage needed to produce a spark at the spark plug. Problems in this circuit, such as a faulty ignition coil, damaged wiring, or faulty connectors, can lead to misfires, poor engine performance, and increased emissions.
P2335 – Quick Overview
Code | Information |
---|---|
Meaning | P2335: Ignition Coil ‘L’ Secondary Circuit Issue |
Is it serious? | Yes, issues in the secondary circuit can lead to weak or absent sparks, causing engine misfires, poor performance, and increased emissions. Immediate attention is recommended. |
Possible causes | – Issues in the ignition coil ‘L’ secondary circuit – Faulty ignition coil – Wiring or connector problems |
How to diagnose? | – Inspect and test the ignition coil ‘L’ secondary circuit – Check wiring and connectors – Replace faulty ignition coil if needed |
P2335 Meaning
The P2335: Ignition Coil ‘L’ Secondary Circuit code means that there is a problem detected with the high voltage side of Ignition Coil ‘L’. The secondary circuit is responsible for creating the spark at the spark plug by transforming low voltage from the primary circuit into high voltage. Problems such as a defective coil, damaged wiring, or poor connections can prevent the spark plug from firing effectively, resulting in engine misfires and rough running.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if other related fault codes are present. Additional codes may provide context and help identify broader issues affecting the ignition system. | OBD-II Scanner |
Inspect Ignition Coil ‘L’ | Visually inspect Ignition Coil ‘L’ for any signs of physical damage such as cracks, burns, or corrosion. Any physical damage to the coil can lead to malfunction in the secondary circuit. | Flashlight, Safety Gloves |
Test the Secondary Circuit of Ignition Coil ‘L’ | Use an ignition coil tester or an ohmmeter to measure the resistance of the secondary winding in Ignition Coil ‘L’. Compare the resistance readings with the manufacturer’s specifications to determine if the coil is within an acceptable range. | Ohmmeter, Coil Tester |
Inspect Spark Plug Connected to Coil ‘L’ | Check the spark plug that is connected to Ignition Coil ‘L’ for fouling, wear, or damage. A compromised spark plug can place additional stress on the ignition coil, leading to secondary circuit failure. Replace if necessary. | Spark Plug Wrench, Replacement Spark Plug |
Inspect Wiring Leading to Coil ‘L’ | Inspect the wiring leading to Ignition Coil ‘L’ for signs of frayed wires, melted insulation, or corrosion. Damaged wiring can prevent the required high voltage from reaching the spark plug effectively. | Flashlight, Multimeter |
Check Connectors for Faults | Inspect the connectors associated with Ignition Coil ‘L’. Ensure that all connectors are clean, securely attached, and free from corrosion or bent pins. Poor connections can lead to intermittent or weak spark generation. | Connector Cleaner, Flashlight |
Verify Grounding of Ignition Coil | Ensure that Ignition Coil ‘L’ has a solid and secure ground connection. A weak or improper ground can prevent the secondary circuit from generating the high voltage necessary for a proper spark. Clean and tighten the ground point as needed. | Multimeter, Hand Tools |
Test Coil Voltage Output | Use an oscilloscope or coil-on-plug tester to check the voltage output of Ignition Coil ‘L’. Verify that the coil is generating enough voltage to effectively create a spark at the spark plug. | Coil-on-Plug Tester, Oscilloscope |
Replace Faulty Components if Necessary | Replace any defective ignition coils, connectors, or wiring with OEM components to ensure compatibility and reliable performance of the ignition system. | Replacement Parts, Hand Tools |
Clear the Code and Test Drive | After completing the repairs, clear the P2335 code using an OBD-II scanner. Start and drive the vehicle to monitor ignition performance and verify that the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to verify that the P2335 code has not returned. If the code persists, additional diagnostics focusing on the ECM or other related components of the ignition system may be required. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)