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What are the probable causes of DTC P2444? - 2005 Buick LaCrosse

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Hello Please read this carefully. This info directly relates to the code you are having. I will include a troubleshooting tree at the bottom. If there are any other codes or if you need further info please let me know:

SYSTEM DESCRIPTION The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. An electric air pump, the AIR pump, provides filtered air on demand to the AIR control solenoid valve/pressure sensor assembly. The AIR control solenoid valve/pressure sensor assembly controls the flow of air from the AIR pump to the exhaust manifold. The AIR valve relay supplies the current needed to operate the AIR control solenoid valve/pressure sensor assembly. A pressure sensor is used to monitor the air flow from the AIR pump. The powertrain control module (PCM) supplies the internal pressure sensor with a 5-volt reference, an electrical ground, and a signal circuit.

The AIR diagnostic uses 3 phases to test the AIR system:

  • DTCs P0411 and P2430 run during Phase 1
  • DTCs P2430 and P2440 run during Phase 2
  • DTC P2444 runs during Phase 3
In all 3 phases, testing is accomplished by comparing the measured pressure against the expected pressure. The PCM can detect faults in the AIR pump, AIR control solenoid valve/pressure sensor assembly, and the exhaust check valve. The pressure sensor can also detect leaks and restrictions in the secondary AIR system plumbing.

The DTC P2444 Secondary Air Injection (AIR) Pump is Stuck ON diagnostic monitors the system pressure signal during test phase 3. When the PCM determines the AIR pressure sensor signal is higher than expected, DTC P2444 sets.

DTC DESCRIPTOR
This diagnostic supports the following DTC:
  • DTC P2444 Secondary Air Injection (AIR) System Pump Stuck On
CONDITIONS FOR RUNNING THE DTC
  • DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0350, P0411, P0412, P0418, P0420, P0606, P0641, P0651, P1350, P2430, P2431, P2432, P2433, P2440 are not set.
  • The system voltage is between 10-18 volts .
  • The engine is running.
  • The start-up engine coolant temperature (ECT) parameter is between 5-50°C (41-122°F) .
  • The start-up intake air temperature (IAT) parameter is between 5-60°C (41-140°F) .
  • The BARO parameter is more than 60 kPa .
  • The MAF sensor parameter is between 3-24 g/s .
  • DTC P2444 runs once per trip start-up when the above conditions are met and the AIR pump operation is requested.
CONDITIONS FOR SETTING THE DTC
The measured AIR pressure is more than expected during AIR pump Phase 3 operation. DTC P2444 sets within 5 seconds when the above conditions are met.

ACTION TAKEN WHEN THE DTC SETS
  • The PCM illuminates the malfunction indicator lamp (MIL) during the first key cycle in which the diagnostic trouble code (DTC) sets.
  • The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Freeze Frame buffer.
CONDITIONS FOR CLEARING THE MIL/DTC
  • The PCM turns OFF the MIL on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
  • A DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
  • A DTC can be cleared by using the scan tool Clear Information function.
DIAGNOSTIC AIDS

Inspect for any of the following conditions:
  • The resistance of the AIR pump relay coil (across terminal 85 and terminal 86) is 50-70 ohms at 20°C (68°F) . In the normal unenergized state, the resistance of the open relay contacts (across terminal 30 and terminal 87) is infinite.
  • The AIR pump relays electrical contacts may be pitted and sticking. Replace the relay if tapping gently on the relay or wiggling the relay causes a change in the relays operation.
  • The performance of the AIR pump relay may be affected by temperature. Check the relay after sitting outside overnight and after running the engine 30 minutes .
  • An intermittent malfunction may be caused by a fault in an AIR system electrical circuit. Inspect the wiring harness and components for an intermittent condition.


What are the probable causes of DTC P2444? - 21812371-jq13pypi3egybe0aho3o0ljx-4-0.gif

The numbers below refer to the step numbers on the diagnostic table.
  1. This step tests for the correct operation of the AIR pump. When the AIR pump relay is commanded ON with the scan tool, only the AIR pump relay is energized. When the AIR valve relay is commanded ON with the scan tool, both the AIR pump and the AIR valve relays are energized.
  2. This step tests for the correct operation of the AIR pump relay.

Posted on Jul 06, 2015

  • David Payne
    David Payne Jul 07, 2015

    Good Answer Tim. Well layout.

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The procedure to replace head light assembly on buick lacrosse is as follows:--- 1)To remove and replace the headlight assembly you will need to remove 1 retaining bolt on the top of the headlamp assembly and 2 sliding retainers at the rear. 2) The carefully Pull up the retainers and that will release the headlight assembly and allow you to pull it out the front. 3) When installing the new headlight assembly make sure you have it lined up correctly before trying to install the retainers, don't force them it may get cracked . 4) Both the cover and the bulb are removed by a standard twist to the counterclockwise and replaced by a twist to the clockwise. 5) Now to the dim light. You have to release the entire light assembly before you can remove the screw-on cover to reach the light. 6) On the rear edge of the light unit closest to the engine is a white locking tab. Pull that tab up just to the point where it releases…pull too far and it locks again. 7) Next, locate the other locking bracket which is a metal bracket in the center-rear of the light assembly. This bracket is held down by a screw. 8) Remove the screw with a 10mm wrench. Lift the bracket just like you did the white bracket. You should now be able to pull (or pry) the entire light unit forward a little. Depending on the size of your hands this might be enough. Note:-- The turn signal is part of the headlight assembly on your 2005 Buick LaCross. 9) To replace the headlight bulb you need to remove the front bumper cover. 10)To release the plastic bumper assembly to give you a little more space. This is done by removing two expansion locking pins, one that holds the little plastic strip down between the bright and dim lights and one that is located inside a rubber bumper on the engine side of the light unit. 11)To remove these locking pins, pull or pry up the little tab in the center of the pin. Thanks.

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