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P2003 is a diagnostic trouble code (DTC) for "Diesel Particulate Filter Efficiency Below Threshold Bank 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P2003 is a generic diagnostic trouble code (DTC) that indicates a fault with the Diesel particulate filter.
This code is identical to the P2002 code except that P2002 is for bank 1.
The P2003 code means that the diesel particulate filter efficiency has dropped below the given threshold for bank 2. The ECU closely monitors the diesel particulate filter and its efficiency and when it drops below the expected range a Check Engine Light is set. The Check Engine Light will be displayed on the dashboard and will remain until repaired or normal operation is present. P2003 may cause a limp mode if left unattended.
Qualified technicians will begin by using a scan tool to access all codes stored in the ECU.
Technicians will note codes present and any freeze frame data associated with them.
Next all codes will be cleared.
A long test drive at freeway speeds is done in order to burn out any particulate found in the DPF filter.
If the code reappears, then a visual inspection will be done looking for any damage to the DPF or wiring.
Next, the live engine data will be observed while the engine is operating and the throttle will be depressed looking for a change in the exhaust pressure sensor readings in comparison to bank 1.
Mistakes are easy to make when diagnostic steps are not completed in the proper order.
A common mistake is to replace the DPF when it just needed to be driven at freeway speeds to clear the filter out.
If nothing is done to repair the persistent P2003 code, the ECU will put the vehicle into a limp mode. This mode limits the top speed and reduces engine power greatly to protect the engine. The limp mode can be problematic if far from home.
An advanced level scan tool will be helpful in diagnosing the P2003 code. These scan tools allow access to the the ECU’s data stream which shows live data such as sensor readings and voltage. With this information it makes it much easier to ensure many different systems are operating properly.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.