Yukon threw warnings and died - Error Code P0601

[Xypher]

Hi all,

Just got a 2014 Yukon SLT (5.3 motor) Wednesday and it ran fine untll today. My wife was sitting at her Dad's shop to see why the check engine light was on earlier (O2 sensor apparently) when it just stopped running and threw errors about stabilitrak and a few others. He ran the scanner again it it gave out error P0601 and mentioned the PCM. It would not start until he cleared the codes. She drove it home it and died in the driveway (about 15 after the first time it died). I did a little research and checked on here but found only 1 post with the same error code. Any tips or ideas where to start or what it could ultimately be? Best guess is a faulty ground somewhere, but hoping to avoid replacing the module all together. Anyone had experience with this error? We're hoping to go through it tomorrow and see what we can figure out.
Thanks in advance!

 

[wjburken]

Hi all,

Just got a 2014 Yukon SLT (5.3 motor) Wednesday and it ran fine untll today. My wife was sitting at her Dad's shop to see why the check engine light was on earlier (O2 sensor apparently) when it just stopped running and threw errors about stabilitrak and a few others. He ran the scanner again it it gave out error P0601 and mentioned the PCM. It would not start until he cleared the codes. She drove it home it and died in the driveway (about 15 after the first time it died). I did a little research and checked on here but found only 1 post with the same error code. Any tips or ideas where to start or what it could ultimately be? Best guess is a faulty ground somewhere, but hoping to avoid replacing the module all together. Anyone had experience with this error? We're hoping to go through it tomorrow and see what we can figure out.
Thanks in advance!

These trucks hate low voltage/poor grounds. I would check all of your power cables and the connections. I would also check all the grounding cables and their connections. How old is the battery? What is the voltmeter reading on the dash?

 

[OR VietVet]

What Wade said. Check all power and ground connections. All over the place. A failed PCM is a very rare thing.

 

[Xypher]

These trucks hate low voltage/poor grounds. I would check all of your power cables and the connections. I would also check all the grounding cables and their connections. How old is the battery? What is the voltmeter reading on the dash?

Unsure of the batteries age, but the volt gauge is around 14v or a little more. Is there any particular grounds that are the "typical" ones that need to be touched up? Or is it more check them all and good luck?

 

[OR VietVet]

Check them all and good luck. Most of what you are looking for will be under the hood, on the engine and near the firewall but they can be also down on the frame and back a ways. Make sure the connections are clean and tight at the battery and the starter.

Plus, it is not so much as a LOOK thing as it is a FEEL thing. Lay hands on them and wiggle and even disassemble and clean and refasten them correctly. If you are in the rust belt that salt plays hell with these grounds and power connections.

 

[Xypher]

Check them all and good luck. Most of what you are looking for will be under the hood, on the engine and near the firewall but they can be also down on the frame and back a ways. Make sure the connections are clean and tight at the battery and the starter.

Plus, it is not so much as a LOOK thing as it is a FEEL thing. Lay hands on them and wiggle and even disassemble and clean and refasten them correctly. If you are in the rust belt that salt plays hell with these grounds and power connections.

Oh yes, I live in Maine so EVERYTHING ends up rusting here. I’ve had plenty of vehicles in the past where the motor outlasted the body.

 

[Xypher]

Ok one more question. If I have to end up replacing the pcm, is this the right part?
https://www.gmpartscenter.net/oem-p...9eXVrb24meT0yMDE0JnQ9c2x0JmU9NS0zbC12OC1mbGV4

Thanks again.

 

[OR VietVet]

https://www.rockauto.com/en/moreinfo.php?pk=1792002&jsn=2689


Yes, looks to be same as this from Rock Auto.

Or this one at Amazon:

https://www.amazon.com/ACDelco-1263...1_10?keywords=12633238&qid=1582417317&sr=8-10

 

[OR VietVet]

Read this about the grounds:

https://www.rockauto.com/Newsletter/

 

[swathdiver]

Hi all,

Just got a 2014 Yukon SLT (5.3 motor) Wednesday and it ran fine untll today. My wife was sitting at her Dad's shop to see why the check engine light was on earlier (O2 sensor apparently) when it just stopped running and threw errors about stabilitrak and a few others. He ran the scanner again it it gave out error P0601 and mentioned the PCM. It would not start until he cleared the codes. She drove it home it and died in the driveway (about 15 after the first time it died). I did a little research and checked on here but found only 1 post with the same error code. Any tips or ideas where to start or what it could ultimately be? Best guess is a faulty ground somewhere, but hoping to avoid replacing the module all together. Anyone had experience with this error? We're hoping to go through it tomorrow and see what we can figure out.
Thanks in advance!

That code means the memory in the ECM for the throttle positions has failed. Time for a new ECM. It will have to be programmed to your vehicle.

 

[BG1988]

Hi all,

Just got a 2014 Yukon SLT (5.3 motor) Wednesday and it ran fine untll today. My wife was sitting at her Dad's shop to see why the check engine light was on earlier (O2 sensor apparently) when it just stopped running and threw errors about stabilitrak and a few others. He ran the scanner again it it gave out error P0601 and mentioned the PCM. It would not start until he cleared the codes. She drove it home it and died in the driveway (about 15 after the first time it died). I did a little research and checked on here but found only 1 post with the same error code. Any tips or ideas where to start or what it could ultimately be? Best guess is a faulty ground somewhere, but hoping to avoid replacing the module all together. Anyone had experience with this error? We're hoping to go through it tomorrow and see what we can figure out.
Thanks in advance!

PCM's Memory check sum test is failing. that means the on board rom failed


the ROM ('read only memory' has failed)


bad voltage faluty battery bad alternator bad wires

worst case the memory chip soldering failed or the ROM has failed, faulty programming

 

[Xypher]

Update: Dropped it off at the stealership, waiting to hear back from them. We bought it from them a week ago on their wholesale to the public lot. You can get a decent price but the issue with that is it comes with no warranty. They said they'd "work with us" on the cost. Can't wait to see what they say is wrong with it and the cost. I will update when we get it back since this seems to be an issue that's not posted on here much.

 

[Rocket Man]

Looking forward to the update.

 

[Xypher]

They couldn’t replicate the error or get the vehicle to shut down. They didn’t want to replace the ecm because “it’s expensive”. Yeah, we all know that it’s expensive at a dealership. Charged me $99 for the diagnostics that I didn’t need done and told me to come pick it up. If it does it again to just bring it back. So literally nothing was resolved, and just need to hope it doesn’t shut down going 70mph down the highway.