How severe is this DTC?
When a P2304 is stored, the cause should be diagnosed as soon as possible. The symptoms that likely accompany these codes will generally require immediate attention.
What are some of the symptoms of the code?
Symptoms of a P2304 trouble code may include:
- Engine misfires
- Decreased engine performance
- Reduced fuel efficiency
- Other related codes
- Fuel injector operation for the affected cylinder may be disabled by the PCM
What are some common causes of the code?
Causes of this code may include:
- Faulty relay or blown fuse (fuse link)
- PCM failure
- Open or shorted wiring or wiring connectors (wildlife damage)
- Faulty ignition coil
- Defective camshaft or crankshaft sensor or wiring
What are the P2304 troubleshooting steps?
You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2304 code.
You can save yourself time and trouble by searching for Technical Service Bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.
After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.
The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2304 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.
You can obtain connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.
Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged. Wiring on top of the engine is often damaged by wildlife trying to stay warm in cold climates.
Use the DVOM to test the voltage and ground circuits at the ignition coil in question. If no voltage is detected, check the system relay and associated fuses. Replace faulty relays and/or blown (or otherwise defective) fuses as needed.
If voltage and ground are detected at the coil, test the ground circuit corresponding to the PCM connector with the engine running. If a ground pulse is detected there, suspect an open circuit between the coil in question and the PCM. If no ground pulse is found there, suspect a faulty PCM or programming error.
P2304 is frequently stored due to wiring damage caused by wildlife