DTC Code P02E3 – What does this code mean?

<ul> <li><b>Malfunction Indicator Light On</b>: The Malfunction Indicator Light (MIL) illuminates, indicating an issue with the diesel intake air flow control circuit. This is often the first sign of a problem.</li> <li><b>Low Idle Speed</b>: The vehicle may experience a low idle speed, which can be linked to improper air flow control affecting engine performance.</li> <li><b>Flashing Electronic Throttle Control Symbol</b>: A flashing Electronic Throttle Control (ETC) symbol may appear on the dashboard, indicating a problem with the air flow control circuit.</li> <li><b>No Regeneration of Diesel Particulate Filter</b>: The diesel particulate filter (DPF) may fail to regenerate, leading to soot build-up. This can eventually cause a loss of power as the DPF becomes clogged.</li> </ul>

<ul><li>Short to power in the signal circuit to the Diesel Intake Air Flow Control System (DIAFCS) motor/control.</li><li>Failed Diesel Intake Air Flow Control System (DIAFCS) motor/control.</li><li>Failed Powertrain Control Module (PCM).</li></ul>

<ul> <li><b>Check Technical Service Bulletins (TSB)</b>: Verify if there are any TSBs related to the P02E3 code for your vehicle. This can provide known fixes and save diagnostic time.</li> <li><b>Locate DIAFCS Motor/Control System</b>: Find the Diesel Intake Air Flow Control System (DIAFCS) motor/control, typically attached to the intake manifold.</li> <li><b>Visual Inspection</b>: Inspect the connector and wiring for damage such as scraping, rubbing, bare wires, burn spots, or melted plastic. Check terminals for burns or corrosion.</li> <li><b>Clean Terminals</b>: Use electrical contact cleaner and a plastic bristle brush to clean the terminals. Let them dry and apply electrical grease.</li> <li><b>Clean Carbon Deposits</b>: If a mechanical code was set, use intake cleaner and a rag to clean carbon deposits behind the throttle plate. Do not spray cleaner directly into the engine.</li> <li><b>Clear DTC Codes</b>: Use a scan tool to clear the DTC codes from memory. Check if the P02E3 code returns.</li> <li><b>Test DIAFCS and Circuits</b>: With the Key Off, disconnect the DIAFCS motor/control connector. Use a Digital Voltmeter to check for 12 volts at the motor terminal with the Key On Engine Off. Repair power or ground wire if voltage is incorrect.</li> <li><b>Replace DIAFCS Motor/Control</b>: If the previous tests pass and the P02E3 code persists, replace the DIAFCS motor/control. If the issue continues, consider PCM replacement.</li></ul>

<p>The DTC code P02E3 indicates a high circuit issue in the Diesel Intake Air Flow Control. Given the provided information, the severity is minor. <ul><li>If mechanical issues are the cause, expect low idle speed.</li><li>If it is an electrical failure, the PCM can compensate adequately.</li></ul> Immediate actions include checking the intake air flow control circuit and ensuring all connections are secure to prevent potential drivability issues.</p>