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Exhaust Temperature Too High For Particulate Filter Regeneration

The Powertrain Control Module (PCM) monitors the conditions necessary for diesel particulate filter regeneration. During vehicle operation if the diesel particulate filter temperature is greater than a calibrated limit, the PCM stores the amount of time the temperature is greater than the limit. The test fails when the temperature before or after the diesel particulate filter is greater than the calibrated limit for greater than 120 minutes over the life of the filter.

Faulty diesel particulate filter
Fuel system concerns
Customer driving habits
Exhaust restriction

Check engine light

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