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Discussion Starter · #1 · (Edited)
Got the code while driving. No other symptoms. Reset with code reader and the next drive it reoccurred.

2016 Jeep EcoDiesel - 92,000 miles (40,000 since emissions recall mod)

Anyone ever have this code before? Curious as to the specific diagnosis and repair. Also curious if the extended warranty for the emissions modification covers repair.


Described as below according to inter-webs,

OBD-II Code Exhaust pressure sensor failure is defined as a Diesel Particulate Filter Pressure Sensor "A" Circuit
Diesel Exhaust Fluid (DEF) is used to assist in converting leftover exhaust particles to harmless gases. In order to burn off those particles, the temperature of the exhaust system needs to increase. the injection of DEF Fluid into the exhaust stream brings Diesel Particulate Filter (DPF) up to temperature. The system is then able to convert harmful NOx to Nitrogen, Carbon Dioxide, and water. The Reductant Catalyst (SRC) was added to further reduce any NOx was still in the exhaust stream. The Exhaust Pressure Sensor measures exhaust pressure going into and out of the Diesel Particulate Filter (DPF). If the engine computer (PCM) detects an implausible signal from one of the pressure sensors, code P2456 will be set.

Exhaust pressure sensor failure Symptoms
  • Clean exhaust filter message may appear on the instrument cluster
Common Problems That Trigger the P2456 Code
  • Exhaust leak
  • Exhaust pressure sensor failure
  • Restriction in the exhaust system
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