What does P2311 Ignition Coil D Secondary Circuit mean?
The P2311 code refers to an issue with the Ignition Coil D Secondary Circuit.
This code is commonly found in vehicles from brands like Jeep and Dodge.
When this code is stored, it means that the powertrain control module (PCM) has detected an abnormal voltage condition in the secondary control circuit of the ignition coil designated with the letter D.
The primary circuits of the ignition coil supply battery voltage to the coil, while the secondary coil circuits are responsible for transferring the high-energy spark from the coil to the spark plug.
If the primary voltage is insufficient, the engine cylinder will not produce horsepower.
Symptoms of this code may include engine misfires, diminished engine performance, reduced fuel efficiency, and other related codes.
Some common causes of this code include a bad spark plug wire or boot, malfunctioning relay or blown fuse, open or shorted wiring or wiring connectors, defective ignition coil, or faulty camshaft or crankshaft sensor or wiring.
To diagnose and repair this code, you will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and access to reliable vehicle information.
P2311 Symptoms
- Engine misfire
- Diminished engine performance
- Reduced fuel efficiency
- Other related codes
- Fuel injector operation for the affected cylinder may be disabled by the PCM
Possible P2311 Causes
- Bad spark plug wire or boot
- Malfunctioning relay or blown fuse (fusible link)
- Open or shorted wiring or wiring connectors (wildlife damage)
- Defective ignition coil
- Faulty camshaft or crankshaft sensor or wiring
Troubleshooting P2311 error code
- Connect a diagnostic scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data
- Clear the codes and test drive the vehicle to see if the code is restored or if the PCM enters readiness mode
- Perform a visual inspection of related wiring and connectors, repairing or replacing damaged wiring
- Replace spark plug wires and boots if the vehicle is beyond the recommended maintenance interval for a tune-up
- Check for high-energy ignition (HEI) at the spark plug and at the coil
- Based on the results, suspect and replace defective components such as spark plug, plug wire/boot, or ignition coil
- Test HEI carefully with the engine running
- Consider a maintenance tune-up if necessary
