P0606 Intermittent

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Nap73

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What’s up guys

So I’ve got an issue with Goldie

“”””2007 GMC Yukon XL 2500 216,000 miles

Went to start the truck today and it would click but not turn over. It threw a P0606 code and flashed “reduced engine power” on the dash when I finally got it started.

This happened a few weeks ago also but that time the dash was flashing and the radio was going crazy flashing and ejecting a cd.

Both times it ended up starting and running fine.

My question is has anyone delt with this or a similar issue. And if so how did you fix it ?

As always thanks in advance for the help.


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BG1988

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There is actually many reason for the same code

P0606 is ECM is bad..


1# ECM processor P0606 Indicates that the ECM has Detected an internal processor integrity fault.

2# Bosch T43 TEHCM P0606
Security Output Disable /IPT test

3# PCM processor Perforamce /Integrity checK
P0606 Indicates that the HCP has detected an internal processor integrity fault

#4 Control Module internal Performance P0606 This DTC indicates that FSCM has detected an internal processor integrity fault

i would check the wires for damage or corrosion first before replacement

Also I would check and make sure the 12v+ battery is good.

it might have drop too much while it's cranking causing that code.
 
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Big Mama

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What they said. I believe an ecm going bad is fairly rare out of the blue but connections go at this age. I have the same year.
 
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Nap73

Nap73

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It would also be a good idea to inspect and clean all ground connections. Many threads here about that causing multiple probs at the same time. Dash flashing, radio spitting out cd's....etc.
Where can I find all ground connections?

I’ve been looking for a diagram but can’t find one.


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Nap73

Nap73

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def check your battery cables, even if they "look" ok, take them off and give them a scrub with a wire brush, maybe have the battery tested also the change in seasons kills a lot of battery's
I did all that when this happened the first time. Battery has been tested and is good and the connections have been cleaned.


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Doubeleive

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well might be time to start looking at connections, codes seem to point to the ecm so maybe start there and take a good look at the wires and pins, I would look for anything corroded or burnt looking or any frayed wiring
 

BG1988

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I did all that when this happened the first time. Battery has been tested and is good and the connections have been cleaned.


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it might test good that does not mean it's good
mine tested good but failed randomly a couple months later with U0xxx codes... caused the Engine stall upon an auto resume.. as the battery dipped below 9 volts upon a resume... also make sure you clean the battery terminals correctly by taking them apart that means you got to take the 10mm nut off at the posts
there was all kindas of grease and grime (this will cause a open circuit or high impedance connection)..
look how dirty it is compared to a new battery cable

20200314_115328.jpg 20200328_081841.jpg
 
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Nap73

Nap73

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it might test good that does not mean it's good
mine tested good but failed randomly a couple months later with U0xxx codes... caused the Engine stall upon an auto resume.. as the battery dipped below 9 volts upon a resume... also make sure you clean the battery terminals correctly by taking them apart that means you got to take the 10mm nut off at the posts
there was all kindas of grease and grime (this will cause a open circuit or high impedance connection)..
look how dirty it is compared to a new battery cable

View attachment 248745 View attachment 248746
So if the battery test isn’t reliable how do I determine if the battery is good or bad ?

You know what I’ll buy a new battery & new positive & negative battery cables. Can’t hurt.

What’s everyone running battery wise ?

I’ll get AC delco cables but not sure of the brand of battery.


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