Join Date: Apr 2012
Location: Casa Grande, Az
DTC P244C (ENGINE CONTROLS AND FUEL - 6.6L)
Document ID# 1961334
•Perform the Diagnostic System Check - Vehicle (with HP2)Diagnostic System Check - Vehicle (without HP2) prior to using this diagnostic procedure.
•Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC P244C: Catalyst Temperature Too Low During Regeneration
The diesel oxidation catalyst (DOC) converter controls emissions of non methane hydro carbons (NMHC), and soluble organic fraction (SOF). The DOC is also utilized in regenerating the exhaust particulate filter (EPF). The engine control module (ECM) monitors the exhaust gas temperature (EGT) sensor 1 during regeneration to determine if regeneration temperatures can be maintained.
If the ECM detects that the DOC cannot maintain a pre-determined temperature during a regeneration event this DTC will fail, and the regeneration event aborts.
Conditions for Running the DTC
•The engine control system is in an active regeneration.
•DTC P244C runs continuously when the above condition is met.
Conditions for Setting the DTC
•The ECM determines that the EGT sensor 1 is less than 75°C (167°F) of a calibrated threshold, during an active regeneration event.
•The condition exists for greater than 5 minutes.
Action Taken When the DTC Sets
•DTC P244C is a Type A DTC.
•Regeneration will be inhibited.
Conditions for Clearing the DTC
DTC P244C is a Type A DTC.
•The use of 500 ppm sulfur, non-road diesel fuel containing red dye, or the continuous use of non ultra low sulfur fuel may be a possible contributor to the degradation of metals in the DOC. A degraded DOC will not light off, and properly maintain the necessary heat required to completely regenerate the particulate filter.
•If EGT sensor 1 (before the DPF) is slow to respond to exhaust gas temperature changes, or sticks in range, this DTC may set.
2012 GMC 2500 SLT 4x4
---Arizona Diesel Club---
Last edited by KensAuto; 01-03-2013 at 08:57 AM.