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2005 buick rainier
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80 Posts
Discussion Starter #1
Folks, I have a few questions around this code:

1. Is the PCM & ECM one of the same?

2. On the V8...roughly where is this (these) components located?

3. Has anyone used a reprogram service rather than going to the dealer and having them replace / reprogram the PCM / ECM? Who did you use?

Vehicle threw the code this morning and died. It restarted and was able to drive it home.

Thanks
 

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2004 gmc envoy_slt
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2,323 Posts
A PCM is the Powertrain Control Module, a ECM is a Engine Control Module.

For our GM360/370 platforms starting with the year 2002, The PCM controlled the engine and transmission, in 2006 those functions were divided to the ECM and TCM (Transmission Control Module).
 

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2003 chevy trailblazer_ls
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472 Posts
Folks, I have a few questions around this code:

1. Is the PCM & ECM one of the same?

2. On the V8...roughly where is this (these) components located?

3. Has anyone used a reprogram service rather than going to the dealer and having them replace / reprogram the PCM / ECM? Who did you use?

Vehicle threw the code this morning and died. It restarted and was able to drive it home.

Thanks
See if they have a good one at a wrecking yard. Same make model engine. see if it fixes it.
 

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2007 chevy trailblazer_ls
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340 Posts
Here's what I read on the internet:
How does a mechanic diagnose the P0601 code?
•A mechanic will begin by hooking up a scan tool to the DLC port and checking for all codes preset including history and pending code.
•Next, freeze frame data will be noted for every code. This information is critical as it tells us what conditions, such as RPM, engine load, and coolant temperature the vehicle was under when the code was set.
•All codes will then be cleared and taken on a test drive to confirm any issues found, the test drive should be under similar circumstances to when the code was set.
•Next, a visual inspection will be performed to look for any damaged wiring or circuits.
•Then, a multimeter will be used to check for proper voltage supply going to the ECU.
•Lastly, the ECU will need to be tested. Each vehicle has its own testing procedures for the ECU.


Common mistakes when diagnosing the P0601 code
The most common mistake is not checking that the ECU is receiving proper voltage, the ECU then tests bad and is replaced when it is not the cause. All steps must be followed as P0601 can be a difficult code to diagnose with intermittent issues.
And before reading this I was going to suggest checking the connectors before automatically buying a new ECM. :undecided Especially if the problem went away. Computer faults in the silicon seldom fix themselves but electrical connectors have intermittents all the time.

If you buy a new once you can give them the VIN and they will program it for you so it is plug and play. If you get one "used" then I think you are stuck with having a dealer reprogram it.

Where is it roughly located? Roughly somewhere toward the front of the vehicle. :p Don't know and can't seem to find that info for the 5.3L. It is on top of the engine on the driver's side for the 4.2L.
 

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Registered
2005 buick rainier
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80 Posts
Discussion Starter #5
Here's what I read on the internet:
And before reading this I was going to suggest checking the connectors before automatically buying a new ECM. :undecided Especially if the problem went away. Computer faults in the silicon seldom fix themselves but electrical connectors have intermittents all the time.

If you buy a new once you can give them the VIN and they will program it for you so it is plug and play. If you get one "used" then I think you are stuck with having a dealer reprogram it.

Where is it roughly located? Roughly somewhere toward the front of the vehicle. :p Don't know and can't seem to find that info for the 5.3L. It is on top of the engine on the driver's side for the 4.2L.
Thanks for the info. I'm going to create a new post around the ECU p/n and availability, thanks again
 
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