P2003

P2003 is the Bank 2 mirror of P2002 and only sets on V-configuration diesels with twin DPFs or dual-bank pre/post pressure sensors, indicating the right-bank filter is reading below its modeled trap efficiency. Cheapest-first ladder: compare Bank 1 versus Bank 2 differential pressure side-by-side at idle and at 2000 rpm under load, since a healthy pair tracks within 1 kPa of each other; if Bank 2 reads notably lower the substrate side is cracked or the sample tube is loose, and if Bank 2 reads notably higher you have asymmetric soot loading from a Bank 2 injector overfueling. Pull Bank 2 fuel trims and injector balance rates (acceptable window is plus or minus 4 mg/stroke at idle), then run a bidirectional forced regen and confirm post-DPF temp on Bank 2 reaches 600 C without lagging Bank 1 by more than 30 C. Caveat: do not replace the right-bank DPF until you have ruled out a leaking Bank 2 EGT sensor port or a sooted Bank 2 turbo seal pushing oil through the filter, because both produce the same code.

Vehicle-specific patterns: 2011 to 2014 Ford 6.7L Powerstroke Super Duty trucks set P2003 from a Bank 2 EGT 13 sensor leaking at the bung, masking real Bank 2 temps; 2014 to 2018 Ram 1500 EcoDiesel 3.0L cracks the rear DPF substrate from short-trip use; 2010 to 2016 Mercedes Sprinter 3.0L OM642 BlueTEC sets P2003 when the right-bank pressure line collapses internally; 2017 to 2020 Ford F-450/F-550 6.7L PSD fleet trucks set the code from a sooted Bank 2 turbo VGT actuator. Estimated repair: $220 to $4,800.