Ignition Coil "C" Primary Control Circuit High
P2307 indicates the ignition coil C primary control circuit is receiving a voltage signal that is higher than the PCM expects. This prevents proper ignition coil operation for one or more cylinders, causing misfires and reduced engine performance.
What You Might Notice
- Engine misfire or rough idle
- Diminished engine performance and acceleration
- Reduced fuel efficiency
- Check engine light illumination
- Fuel injector may be disabled for affected cylinder
Most Common Causes
- 1
Faulty ignition coil
The ignition coil C has failed electrically or is producing incorrect voltage signals to the PCM, triggering the high voltage fault.
- 2
Wiring or connector issues
Damaged, corroded, or loose wiring in the ignition coil circuit can cause voltage irregularities and poor signal transmission to the PCM.
- 3
PCM or control module malfunction
A faulty powertrain control module may misinterpret normal voltage signals as excessively high, falsely triggering this code.
- 4
Ground circuit problems
Poor or broken ground connections in the ignition coil circuit can cause voltage imbalances and control circuit faults.
How to Diagnose It
- 1
Check Faulty ignition coil — The ignition coil C has failed electrically or is producing incorrect voltage signals to the PCM, triggering the high voltage fault.
- 2
Check Wiring or connector issues — Damaged, corroded, or loose wiring in the ignition coil circuit can cause voltage irregularities and poor signal transmission to the PCM.
- 3
Check PCM or control module malfunction — A faulty powertrain control module may misinterpret normal voltage signals as excessively high, falsely triggering this code.
- 4
Check Ground circuit problems — Poor or broken ground connections in the ignition coil circuit can cause voltage imbalances and control circuit faults.
How to Fix It
- 1
Replace ignition coil C
Remove and replace the faulty ignition coil with a manufacturer-approved or quality replacement part to restore proper voltage and ignition operation.
- 2
Inspect and repair wiring
Examine the ignition coil circuit wiring harness for corrosion, breaks, or loose connections. Repair or replace damaged wiring and reseat connectors firmly.
- 3
Clean and inspect connectors
Remove corrosion and debris from ignition coil connectors using electrical contact cleaner and a soft brush. Ensure tight connections between the coil and PCM harness.
- 4
Check PCM and ground circuits
Verify all ground connections are clean and secure. If wiring and coil are functional, the PCM may require diagnostics or reprogramming by a dealer.
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