Power-train warning light

2006 HOLDEN COMMODORE
20 MILES • 4.3L • V6 • 4WD • AUTOMATIC
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HAMEDSTAR
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Hello,

I have the vehicle listed above VZ v6 Executive 3.6l, "check power-train"warning light comes on dash. I had a GSCAN fault tool hooked up to it and it showed the following error codes and messages:

P0300 - Random/Multiple Cylinder Misfire Detected.
P0302 - Cylinder 2 Misfire Detected.
P0304 - Cylinder 4 Misfire Detected.
P0306 - Cylinder 6 Misfire Detected.
U0121 Lost Communication With Anti-Lock Brake.

U0415 Invalid data received - anti-lock brake system.
P0850 Park/Neutral Switch Input Circuit.

I have recently replace spark plugs after message comes after 5 days comes again
Replaced engine oil and filter.

Before change spark plugs when "check power-train" comes I feel engine vibrate and can't increase speed more than 90 KM/H.
Later after spark plugs replaced I feel car normal when "check power-train" come and car can move more than 100KM with out any problem.

Please help
Nov 18, 2019 at 2:10 PM
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STRAILER
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Hello,

It sounds like you have more than one problem. We will handle the misfire issue on this post please make a new question for the ABS problem. The misfire issue sounds like the MAF or fuel pump need to be replaced. Here are two guides to help us see whats going on:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Nov 20, 2019 at 10:45 AM
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HAMEDSTAR
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Thank Mr.Ken for great help, i forget to tell you that Drive Shaft Center Bearing and Support is defective and need replacement is that can effect on misfire issue .
Nov 21, 2019 at 1:04 PM
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STRAILER
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It wont affect the way the engine runs but it will cause the car to act funny. Can you please shoot a quick video with your phone so we can see what's going on? that would be great. You can upload it here with your response.
Nov 22, 2019 at 9:20 AM
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HAMEDSTAR
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Done, Here are two videos:
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Nov 23, 2019 at 7:30 AM
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STRAILER
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Nice work on the videos. it seems like the engine is running okay. I would make sure you have fresh spark plugs and then clear the codes and replace the MAF sensor.

Here are two guides to help us:

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://youtu.be/ahK_eucFi-k

Please run down these guides and report back.
Nov 23, 2019 at 11:12 AM
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HAMEDSTAR
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Dear Mr. Ken,

i really appreciate your help and support, kindly be informed that fresh spark plugs already
replaced 10 days ago after I had a GSCAN fault tool.
now i did again G Scan with WIFI interface and clrear all codes only code P0521 comes
and still check power train comes.

Replaced engine oil and filter from 2 week ago and move only 300 KM.

Thanks
Nov 26, 2019 at 4:21 AM
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STRAILER
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The P0521 code is set when the ECM detects the voltage value is either higher or lower than the specified acceptable range of oil pressure. This code can also be set when the engine detects constant fluctuation of the oil pressure value. How many miles on the engine? It sounds like you may have a clogged oil pump pick up screen. I don't see a oil pressure gauge in the cluster correct? Let remove the oil pressure sender and insert a manual gauge to see what the pressure is it sounds like it could be low. Please let me know.
Nov 26, 2019 at 12:26 PM