P2310 indicates the Powertrain Control Module (PCM) has detected a higher-than-expected voltage on the primary control circuit for ignition coil D (typically cylinder 4). This suggests an electrical fault in the ignition coil's control circuit, preventing proper firing of the affected cylinder.
The ignition coil's primary winding can develop an internal short, causing excessive circuit voltage that triggers the code. This is the most common root cause.
Chafed, melted, or shorted wiring in the coil primary circuit—often from heat damage or engine movement—can create unwanted voltage paths.
Oxidation, bent pins, or poor terminal contact at the coil connector or PCM harness can cause intermittent high-voltage readings.
A heavily fouled, cracked, or grounded spark plug can cause abnormal coil loading and circuit voltage spikes.
Insufficient voltage supply or poor ground to the PCM's ignition driver circuit can produce false high-voltage readings.
The PCM's internal ignition coil driver circuitry can fail, though this is rare and should be diagnosed after all other causes are ruled out.
Driving is not recommended. The engine will likely misfire, causing rough operation, catalytic converter damage from unburned fuel, and poor fuel economy. The vehicle should be diagnosed promptly.
No. While the ignition coil is the most likely cause, wiring issues, connector problems, and faulty spark plugs can also trigger this code. Thorough diagnosis is necessary.
PCM replacement is rarely needed for this code. Most shops replace the PCM only after verifying all other causes (coil, wiring, connectors, spark plugs) are sound. A failed PCM accounts for less than 5% of P2310 cases.
Possibly, if a severely fouled spark plug is causing abnormal coil circuit loading. However, this is uncommon as the primary cause. The coil itself fails more frequently.