P244C

DTC P244C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P244C
- Catalyst Temperature Too Low During Regeneration

Circuit/System Description

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.

Diagnostic Aids

* 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.

Circuit/System Verification

Important: Perform the Repair Verification after completing the Circuit/System Testing.

1. Verify that DTCs P003A, P0047, P0048, P0087, P0101, P0201-P0208, P02A1, P02A5, P02A9, P02AD, P02B1, P02B5, P02B9, P02E0, P02E7-P02E9, P029D, P0300-P0308, P0402, P046C, P0420, P0545, P0546, P2032, P2033, P2269 are not set.

^ If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

2. Verify that exhaust leaks do not exist before the DOC. Refer to Exhaust Leakage. Exhaust Leakage

Circuit/System Testing

Important: Perform the Repair Verification after completing the Circuit/System Testing.

1. Inspect the DOC for any of the following abnormal conditions:

* Physical damage or alterations
* Internal rattles caused by a damaged catalyst substrate
* Internal restrictions-Refer to Restricted Exhaust. Restricted Exhaust

^ If a condition is found, replace the DOC.

2. Inspect the exhaust system for the following conditions:

* Restrictions-Refer to Restricted Exhaust. Restricted Exhaust
* Exhaust leaks before DPF
* Physical damage or alterations

^ If a condition is found, repair the exhaust system as necessary.

3. Inspect for the following conditions, which may cause a DOC to degrade:

* An engine misfire-Refer to Fuel Injector Balance Test with Tech 2. Fuel Injector Balance Test With Tech 2
* Engine oil or coolant consumption
* Leaking fuel injectors
* A fuel that does not meet the ultra low sulfur requirements, red dye fuel, or off road diesel fuel
* Contaminated fuel-Refer to Contaminants-in-Fuel Diagnosis. Contaminants-in-Fuel Diagnosis

^ If a condition is found, repair as necessary, then replace the DOC.

4. If all inspections and tests are normal, replace the DOC.

Repair Instructions

* Catalytic Converter Replacement (4.3L) Catalytic Converter Replacement (4.8L, and 5.3L ) Catalytic Converter Replacement (6.0L - Right) Catalytic Converter Replacement (6.0L - Left) Catalytic Converter Replacement (6.6L (LMM))
* Exhaust Particulate Filter Cleaning (LMM DPF Service Regeneration) Exhaust Particulate Filter Cleaning (LMM DPF Regeneration Enable)

Repair Verification

Notice: Refer to Diesel Particulate Filter (DPF) Service Regeneration Notice.

Certain engine control conditions can cause the EPF to overload with soot. It will be necessary to clean the EPF as instructed to remove the excess soot accumulation. To avoid the customer's return to the service department, perform the Exhaust Particulate Cleaning procedure.