Ignition Coil "L" Secondary Circuit
P2335 indicates a fault in the secondary circuit of the ignition coil for cylinder L (typically the left bank). The PCM has detected an electrical problem in the coil's secondary winding or its control circuit, which prevents proper spark generation at that cylinder.
What You Might Notice
- Engine misfire on cylinder L
- Diminished engine performance and power loss
- Reduced fuel efficiency
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
Most Common Causes
- 1
Faulty ignition coil
The secondary winding or internal components of the ignition coil are damaged or have failed, preventing proper voltage output to the spark plug.
- 2
Damaged spark plug or wire
A worn, fouled, or incorrectly gapped spark plug or a damaged spark plug wire can disrupt the secondary circuit and cause the fault code.
- 3
Wiring or connector issues
Corroded, loose, or damaged wiring connections between the coil pack and PCM can interrupt the control signal or power delivery to the ignition coil.
- 4
PCM malfunction
A faulty powertrain control module may incorrectly report a secondary circuit fault or fail to properly control the ignition coil output.
How to Diagnose It
- 1
Check Faulty ignition coil — The secondary winding or internal components of the ignition coil are damaged or have failed, preventing proper voltage output to the spark plug.
- 2
Check Damaged spark plug or wire — A worn, fouled, or incorrectly gapped spark plug or a damaged spark plug wire can disrupt the secondary circuit and cause the fault code.
- 3
Check Wiring or connector issues — Corroded, loose, or damaged wiring connections between the coil pack and PCM can interrupt the control signal or power delivery to the ignition coil.
- 4
Check PCM malfunction — A faulty powertrain control module may incorrectly report a secondary circuit fault or fail to properly control the ignition coil output.
How to Fix It
- 1
Replace ignition coil
Disconnect the coil connector and remove the mounting bolts, then install a new OEM or quality aftermarket ignition coil and reconnect all wiring securely.
- 2
Inspect and replace spark plug
Remove the spark plug from the affected cylinder, check its condition and gap, and replace if worn, fouled, or improperly gapped to manufacturer specifications.
- 3
Check and repair wiring
Inspect the coil connectors and wiring harness for corrosion, damage, or loose connections; repair or replace damaged wires and clean corroded connectors with electrical contact cleaner.
- 4
Test or replace PCM
If coil, spark plug, and wiring are confirmed good, have the PCM tested by a qualified technician; reprogram or replace if faulty.
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