<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates that the vehicle's onboard diagnostics system has detected an issue with the Diesel Particulate Filter (DPF) regeneration process. This could be due to prolonged regeneration duration.</li> <li><b>Reduced Engine Performance</b>: The vehicle may experience reduced power and acceleration. This is often a result of the DPF being clogged or the regeneration process not completing properly.</li> <li><b>Increased Fuel Consumption</b>: A malfunctioning DPF regeneration process can lead to higher fuel consumption as the engine works harder to compensate for the restricted exhaust flow.</li> <li><b>Excessive Exhaust Smoke</b>: You may notice an increase in exhaust smoke, which can be a sign that the DPF is not regenerating correctly and is becoming clogged with soot.</li> </ul>

<ul><li>An exhaust leak can disrupt the regeneration process by allowing unfiltered gases to escape.</li><li>Improperly installed or loose Exhaust Gas Temperature (EGT) sensors can provide inaccurate readings, affecting the regeneration cycle.</li><li>Low engine compression can lead to incomplete combustion, impacting the efficiency of the Diesel Particulate Filter (DPF) regeneration.</li><li>Corroded fuel injectors can cause poor fuel atomization, leading to incomplete combustion and affecting the DPF regeneration.</li><li>Water in the fuel system can cause poor combustion and affect the overall performance of the DPF regeneration process.</li></ul>

<ul> <li><b>Check Technical Service Bulletins (TSB)</b>: Verify if there are any TSBs related to the P2458 code for your vehicle. This can provide known fixes and save diagnostic time.</li> <li><b>Inspect Wiring Harnesses and Connectors</b>: Examine all system-related wiring harnesses and connectors, especially those near hot exhaust pipes and manifolds, for damage or disconnection.</li> <li><b>Load Test Battery and Check Electrical Components</b>: Load test the battery, inspect battery terminal ends, battery cables, and check alternator output to ensure proper electrical system function.</li> <li><b>Retrieve and Record Trouble Codes</b>: Connect a scanner to the diagnostic port, retrieve all stored trouble codes and freeze frame data, and document this information before clearing the codes.</li> <li><b>Test Drive and Monitor Code Reset</b>: Clear the codes and perform a test drive. If the code does not reset immediately, proceed to test the level and quality of the diesel exhaust fluid and activate the DPF regeneration system.</li> <li><b>Inspect Diesel Exhaust Fluid</b>: Check the level and quality of the diesel exhaust fluid. Incorrect or insufficient fluid can cause DPF regeneration failure.</li> <li><b>Activate DPF Regeneration System</b>: If the regeneration procedure was interrupted due to another issue that has been fixed, attempt to complete the regeneration process after clearing the codes.</li> <li><b>Test DPF Pressure Sensor</b>: If the code resets immediately, use a digital volt/ohmmeter (DVOM) to test the DPF pressure sensor according to the manufacturer’s specifications. Replace the sensor if it fails to meet resistance specifications.</li> <li><b>Inspect DPF Pressure Sensor Hoses/Lines</b>: Check the DPF pressure sensor hoses/lines for clogging or collapse, as these are common issues that can affect sensor performance.</li></ul>

<p>The DTC code P2458 indicates an issue with the Diesel Particulate Filter (DPF) regeneration duration. This can lead to increased emissions and reduced engine performance.</p><ul><li><b>Immediate Actions:</b> Inspect the DPF system for blockages or malfunctions.</li><li>Check the sensors and control module for faults.</li><li>Perform a forced regeneration if necessary.</li></ul><p>Delaying repair can result in severe engine damage and higher repair costs.</p>