Check engine light with fault code P300E5F and/or P300E5E in MRD1 (CDI) Complaint The check engine light...

Bulletin number

LI49_20-N-080011_2_en

Component

Fuel/propulsion system

Summary

Check engine light with fault code P300E5F and/or P300E5E in MRD1 (CDI) Complaint The check engine light is on, with a possible reduction in power. No soot is present in the exhaust system. Fault codes: P300E5F ‑ The fill level of the Diesel Particulate Filter is too high. Early warning. P300E5E ‑ The fill level of the Diesel Particulate Filter is too high. Regeneration of the Diesel Particulate Filter is disabled. Additional information: No additional fault codes related to the Diesel Particulate Filter or Exhaust Gas Recirculation system may be present for this LI to apply. Cause These fault codes may be triggered due to unfavorable driving conditions, such as: •Frequent short‑distance trips •Extended idle periods •Infrequent highway driving •Incomplete regeneration cycles These conditions can lead to excessive soot accumulation in the Diesel Particulate Filter, resulting in elevated fill levels and regeneration lockout. Remedy Fault code P300E5F indicates that the Diesel Particulate Filter soot load has exceeded 130% but remains below 160%. Regeneration remains permitted. Fault code P300E5E indicates that the Diesel Particulate Filter soot load has exceeded 160%. Regeneration is disabled to protect components. 1. Perform a tailpipe wipe test Inspect the tailpipe for soot using a clean white cloth. • If soot is found, stop this procedure and follow LI49.20‑N‑078466. • If no soot is found, continue with Step 2. 2. Check the Diesel Particulate Filter data Using XENTRY, review and save the following information: • Diesel Particulate Filter fill level • Calculated soot load • Ash load • Regeneration history • Distance and operating time since the last successful regeneration • Relevant exhaust‑temperature and differential‑pressure actual values Process any additional fault codes according to the applicable Guided Tests before attempting regeneration. 3. Perform a manual standstill regeneration Perform a manual standstill regeneration of the Diesel Particulate Filter according to the current XENTRY instructions. • Save or print the regeneration results. 4. If the manual standstill regeneration completes successfully Clear the fault memory and verify that the Diesel Particulate Filter actual values are plausible. • Confirm that the applicable fault codes do not return. • Complete a road test and confirm that no fault codes return. • Use damage code 14370F7 if the vehicle is under warranty. Release the vehicle only after proper Diesel Particulate Filter operation has been confirmed. 5. If the manual standstill regeneration does not complete successfully Replace the Diesel Particulate Filter according to the current Workshop Information System instructions. • Confirm that the MRD1/CDI control unit has the latest available software. Update the software if it is not current. • Thoroughly inspect the exhaust system downstream of the Diesel Particulate Filter for soot. • If soot is found, follow LI49.20‑N‑078466 for the required inspection and replacement of affected components. • Complete all required teach‑in, initial startup, and reset procedures after the repair. • Clear the fault memory and perform a road test. • Recheck the fault memory and verify that the Diesel Particulate Filter actual values are plausible.

Owners of these vehicles have filed 8 complaints in the fuel system category.