P2335 — Ignition Coil “L” Secondary Circuit #

Note: The description for DTC P2335 can vary depending on the vehicle manufacturer. Always refer to your OEM (Original Equipment Manufacturer) service manual for model-specific terminology and procedures.

• Ignition Coil “L” Secondary Circuit High (Ford, GM, Chrysler)
• Ignition Coil L Secondary Circuit Malfunction (Toyota, Honda)
• Secondary Circuit Fault, Ignition Coil L (BMW, Mercedes-Benz)

Summary of DTC P2335 #

P2335 is an OBD-II diagnostic trouble code that indicates an issue detected in the secondary circuit of the ignition coil “L”. The secondary circuit refers to the high-voltage side of the ignition coil, responsible for delivering the spark to the spark plug. If the vehicle’s powertrain control module (PCM) finds abnormal voltage or resistance in this circuit, it will set the P2335 code. This may result in misfires, poor engine performance, or an illuminated check engine light. The code specifically targets the coil labeled “L,” which varies by engine configuration.

Frequent Symptoms for DTC P2335 #

When the P2335 code is present, drivers often notice noticeable changes in how their engine runs. The most common symptoms are:

• Illuminated Check Engine Light
• Rough idle or engine shaking
• Engine misfire (especially at higher RPMs or under load)
• Reduced power or acceleration
• Increased fuel consumption
• Possible hesitation or stalling

Probable Causes for P2335 (Most to Least Common) #

The causes behind the P2335 code range from simple to complex. Here are the most frequent culprits, in order of likelihood:

1. Faulty ignition coil “L” (internal breakdown or open circuit)
2. Worn or fouled spark plug at cylinder “L”
3. Damaged ignition coil wiring or connector (corrosion, loose pins, broken wires)
4. PCM software issue or faulty ignition coil driver circuit
5. Moisture or oil intrusion in the ignition coil area
6. Poor ground connection at the ignition system

Step-by-Step Diagnostic for P2335 #

A systematic approach ensures you don’t overlook any potential causes. Follow these steps:

• Read and record all trouble codes (use a scan tool to check for related misfire or ignition codes).
• Identify ignition coil “L” location (refer to OEM diagrams).
• Inspect ignition coil and connector for signs of damage, corrosion, or moisture.
• Check spark plug at the corresponding cylinder for wear or fouling.
• Test ignition coil resistance (compare to OEM specs for both primary and secondary windings).
• Swap ignition coil “L” with another cylinder; see if the code follows the coil or stays.
• Check wiring continuity from coil connector back to PCM.
• Inspect PCM and related fuses if no fault found in the above steps.

Possible Repairs for P2335 #

Once the root cause is confirmed, these are the most effective repair options:

• Replace faulty ignition coil “L”
• Replace or clean spark plug in the affected cylinder
• Repair or replace damaged wiring or connectors
• Address moisture or oil leaks near ignition components
• Update or reprogram PCM if a software issue is identified
• Repair ground connections as needed

Is It Safe to Drive with P2335? #

Limited. While the vehicle may remain driveable in some cases, continued driving with the P2335 code can cause engine misfires, rough running, and potentially damage the catalytic converter over time due to unburnt fuel. It’s best to address the issue as soon as possible to prevent further complications or costly repairs.

Vehicles Most Commonly Affected by P2335 #

This code is most frequently seen on vehicles with individual coil-on-plug ignition systems. While any modern vehicle can experience this issue, it’s particularly common in:

• Ford F-Series (especially with modular V8 engines)
• Chevrolet Silverado and GMC Sierra
• Toyota Camry and Corolla
• Honda Accord and Civic
• Chrysler 300 and Jeep Grand Cherokee
• BMW 3 Series (N-series engines)

Common Mistakes & Best Practices for P2335 #

Misdiagnosing P2335 can lead to wasted time and money. Here’s what to avoid and how to proceed:

• Replacing the ignition coil without testing (always verify with resistance and swap tests)
• Neglecting the spark plug (a worn or fouled plug can mimic coil faults)
• Overlooking wiring and connectors (visually inspect and test for continuity)
• Ignoring PCM updates or TSBs (check for OEM service bulletins related to ignition faults)

Express FAQ for P2335 #

Q: Can a bad ignition coil cause further engine damage?
A: Yes, ongoing misfires from a faulty coil can lead to catalytic converter damage and even piston or valve issues if ignored long-term.

Q: Is it necessary to replace all ignition coils at once?
A: Not always. If only one coil is faulty, you can replace just that one. However, on high-mileage vehicles, replacing all coils may prevent future issues.