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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-01-2018, 12:58 PM   #1 (permalink)
Tigerprovan26
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Cleaning exhaust keep driving

I am experiencing a intermittent lack of power and code P2459. I purchased the truck new and it is stock. I tow a trailer and have a camper on it always. I live in Colorado and am always climbing mountains at altitude with a load. Up I70 and through the Eisenhower Tunnel to Vail Or South over Raton Pass to Albuquerque NM. are my standard routs. I have always pulled the pass at speed no problem. Last time out i had a low power feeling. Low boost or plugged exhaust i felt. It just didn't feel right or sound right. The "Cleaning Exhaust keep driving" message came on. I was pulling the pass with a trailer and couldn't hold my speed and my foot was in it. Usually i could go 80 no problem and accelerate if desired, uphill. I was droping like a rock at 60 before It went into reduced power mode, I had a basic scan tool and cleared the code and made it to the top of Vail pass where we ride. The light did not come on the 3 hour ride home. This weekend i went to Socorro NM. I felt like it lacked power again. 65 up the hills with it to the mat. Usually i could go 80 and accelerate up hills. Then the power came back, exhaust sounded like it was making boost again. Made it there no problem. On the way home, no power again, the exhaust sounded flat , then on the big, long, hills the cleaning exhaust light came on, keep driving. If i would lift and stay off the gas it would go out. When i got back into it it came back on. 8 or 9 time up Raton pass, each time i cleared the code with my scan tool while driving. So am i loosing boost, creating low power, my foot is in it trying to pull an extreme hill at altitude causing a dirty exhaust, plugging the exhaust filter? Or is a dirty exhaust not letting the turbo build boost? I am told that the ring on the turbo can rust after sitting and become intermittent? My rig sits for months, its a camper only. Thanks

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Old 12-02-2018, 01:36 PM   #2 (permalink)
Ron Nielson
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Having a problem like this is truly frustrating. Perhaps this will shed a little light on a possible fix.



DTC P2459

Diagnostic Instruction


  • Perform the Diagnostic System Check - Vehicle 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 Descriptor

DTC P2459: Diesel Particulate Filter Regeneration Too Often.

Circuit/System Description

The particulates in the exhaust gases are collected by the diesel particulate filter (DPF). When the filter becomes saturated with particulates, they are incinerated by a regeneration process. The regeneration process increases the exhaust gas temperature, warming the diesel oxidation catalyst (DOC) first, then warming the DPF. The engine control module (ECM) monitors the system with inputs from two exhaust gas temperature (EGT) sensors 1 and 2 and an exhaust differential pressure sensor.

The ECM will command an active regeneration base on a calculated soot model. The soot model calculations are based on the following information:


  • Distance since last DPF regeneration.
  • Fuel used since last DPF regeneration .
  • Engine run time since last DPF regeneration .
  • Exhaust differential pressure sensor values.
If the ECM detects that the average time between completed regenerations is less than a calibrated threshold this diagnostic will fail.

Conditions for Running the DTC


  • The engine is running.
  • One active regeneration event has completed.
  • DTC P2459 runs continuously when the above condition is met.
Conditions for Setting the DTC

The ECM detects that the average time between completed regenerations is less than 1 hour 10 minutes.

Action Taken When the DTC Sets

DTC P2459 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P2459 is a Type A DTC.

Diagnostic Aids


  • A skewed or shifted exhaust differential pressure sensor will cause inaccuracies in the soot model and may cause this DTC to set.
  • Exhaust leaks in the exhaust system may cause inaccurate gas temperature sensor or exhaust differential pressure values causing this DTC to set.
  • Improperly installed or loose exhaust gas temperature (EGT) sensors will cause inaccuracies in the soot model and cause this DTC to set.
  • Low engine compression may cause this DTC to set.
  • Corroded fuel injectors will have an inability to properly control regeneration temperatures and may cause this DTC to set.
  • Water in the fuel system will lower the energy of the fuel. Emulsified fuel will lower regeneration temperatures that may cause this DTC to set.
Circuit/System Verification


  • Verify that DTCs P003A, P0047, P0048, P0087, P0101, P0201-P0208, P02A1, P02A5, P02A9, P02AD, P02B1, P02B5, P02B9, P02E0, P02E7-P02E9, P029D, P0234, P0299, P0300-P0308, P0401, P0402, P046C, P0545, P0546, P0698, P0699, P2032, P2033, P2269, P2453, or P2563 are not set.
  • If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List.
  1. Engine running at a warm stabilized idle, observe the scan tool Particulate Filter. Pressure Variance parameter. The value should be between 0-3 kPa.
Circuit/System Testing

Important:

  • Perform the Repair Verification after completing the Circuit/System Testing.
  • DO NOT clear this DTC until the repair is completed. This DTC will take several hours and/or miles to reset.
  • Select Capture Info to store the DTC information with the scan tool.
  • This DTC may require reviewing the Freeze Frame/Failure Records carefully for accurate diagnosis.
  1. Visually inspect the exhaust differential pressure system for any of the following conditions:
    • Modifications.
    • Damaged components.
    • Loose or improperly installed components--Ensure the smaller diameter pressure line is connected to the front of the DPF and to the smaller port of the differential pressure sensor.
    • Improperly routed differential pressure lines--The exhaust differential pressure line should have a continuous downward gradient without any sharp bends or kinks from the sensor to the DPF.
  1. Remove and visually inspect the flexible part of the exhaust differential pressure lines for internal restrictions.
    • If a condition is found, replace the exhaust differential pressure lines.
  1. Test for water in fuel contamination. Refer to Contaminants-in-Fuel Diagnosis.
  2. Ignition ON, observe the scan tool EGR Position Sensor and Desired EGR Position parameters while commanding the EGR solenoid to 20 percent and 0 percent. The values should remain equal to or less than 3 percent of each other.
    • If greater than the specified range, replace the EGR valve and gaskets.
  1. Engine running, verify the scan tool Particulate Filter. Pressure Variance parameter is greater than 0 kPa (0 psi) and increases as engine speed is increased.
    • If less than the specified range, and the parameter decreases as engine speed is increased, inspect for incorrect differential pressure line routing.
  1. Test the charge air cooler (CAC) for leaks. Perform the Full System Air Leak Test and Induction System Smoke Test in Charge Air Cooler Diagnosis.
  2. Test the fuel system for leaking fuel injectors, high fuel pressures, or high fuel injector flow rates. Refer to Fuel Injector Balance Test with Tech 2.
  3. Ignition OFF, disconnect the harness connector at the exhaust differential pressure sensor.
  4. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5 ohms between the low reference circuit terminal 1 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  1. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  1. Verify the scan tool Particulate Filter Pressure Variance parameter is greater than 98 kPa.
    • If less than the specified range, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the ECM.
  1. Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Particulate Filter Pressure Variance parameter is less than 13 kPa.
    • If greater than the specified range, test the signal circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  1. If all circuits, exhaust system, and engine control system components test normal, test the exhaust differential pressure sensor. Refer to Component Testing.
Component Testing

Important:

  • You must perform the Circuit/System Testing in order to verify the integrity of the exhaust differential pressure sensor circuits before proceeding with Component Testing.
  • Perform the Repair Verification after completing the Component Testing.
  1. Ignition OFF, remove the exhaust pressure differential pressure sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 3 and the corresponding terminal of the differential sensor. Install a jumper wire between the low reference terminal 1 of the sensor and ground.
  3. Connect a DMM between terminal 2 of the differential sensor and ground.
  4. Ignition ON, with the J 23738-A or J 35555 connected to the pressure sensor rear pressure port, slowly apply vacuum to the sensor while monitoring the voltage. The voltage should vary and transition smoothly without any spikes or dropouts.
    • If the voltage is erratic, replace the differential pressure sensor.
    • If the sensor tests normal, perform the Repair Verification.
Repair Verification


  1. Install any components or connectors that have been removed or replaced during diagnosis.
  2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
  3. Clear the DTCs.
  4. Turn OFF the ignition for 90 seconds.
  5. Duplicate the Conditions for Running the DTC and use the freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
  6. To avoid the customer's return to the service department, perform the Diesel Particulate Filter (DPF) Regeneration Enable.


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Ron Nielson

2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers
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Old 12-04-2018, 08:47 AM   #3 (permalink)
Tigerprovan26
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Thank You Ron for the information. I have started on it. Will keep you posted on what i find...........
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