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Discussion Starter #1
Ecm has no codes. All sensors show a - number so there default. Every injector shows a fault for power and ground it has fuel pressure and new battery. I’m leaning towards ecm. I checked all grounds but haven’t pined out ecm plugs yet anyone seen this
Thanks shaun
 

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How is cylinder pressure?with plugs out you have spark? I guy I worked with on his the motor wound up bad we thought it was timing chain issues which destroyed the engine.
 

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Discussion Starter #4
Engine has compression

Fuse block looks fine

Tried a different ecm

It seems to be a ground since it shows default settings on sensor readings

Anyone have any wiring diagrams

Thanks shaun
 

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Discussion Starter #6
Ok so ecm and bcm all have proper voltages and grounds.
What I found is All sensors in tcm and ecm are at default. Nothing changes as I crank it seems like a communication issue

I checked ignition switch it has all proper voltages and ground So far still at a loss
 

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Ok so ecm and bcm all have proper voltages and grounds.
What I found is All sensors in tcm and ecm are at default. Nothing changes as I crank it seems like a communication issue

I checked ignition switch it has all proper voltages and ground So far still at a loss
Did you ever find out the problem same issue I thought about crankshaft position sensor or pcm
 

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Look at your high pressure ac switch to see if it's damaged. I had similar issue with no start a d reduced power and the silly switch was the problem.

Sent from my SM-N986U using Tapatalk
 

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Also, check throttle body. Just because sensor has a number doesn't mean it's within acceptable range. When you said you had fuel pressure...was this at the hpfp at the engine?
 

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Look at your high pressure ac switch to see if it's damaged. I had similar issue with no start a d reduced power and the silly switch was the problem.

Sent from my SM-N986U using Tapatalk
An A/C switch caused a reduced power issue? I believe that is the first time I heard of that one.
 

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That's what I was told and moved on after having worked I the problem myself for two days in a parking lot I gave in and had it towed. Throttle body was new, spark plugs, intake gasket, pcv orifice mod, clean air intake, etc, etc all had been done prior. These cara work off a single or dual computer and all types of things effect one another in positive ways and some not. If it wasn't I'm OK with that considering I paid less than the other shop wanted and the week or more to just look at. This shop had me in on Monday afternoon and I picked it up Wednesday morning. If someone can post a wiring diagram of the high pressure switch??

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I'm not an electrical specialist but in chart 8 the ac sensor runs thorough the ECM and powertrain. My best guess from is that the ECM saw the fault and sent a message to the powertrain to go into limp mode thinking something was wrong. This happened while I was stopped at a traffic light and before turning it started stalling and revving up and down. The car started up a few times but would not run over 15-20mph and then finally wouldn't start at all. All this happened suddenly and without warning. Drove it for a about 5 miles back towards home in limp mode or power something error and then decided it was to risky to have it stall again and parked in another lot. The next day started it right up and then limp mode again. That was it and to the tow and shop it went. I lost two days working I this and for a little under $300 I'm back on the road ang have made up the money not having to rent another vehicle to carry my family of 8 to 3 events.

Sent from my SM-N986U using Tapatalk
 

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If that was the cause then we will need to update the numerous reasons we may go into Reduced Power Mode, one for the books. Thanks for updating, Numerous sensors cause various issues and erroneous messages on these sophisticated vehicles, sometimes unnecessarily.
 

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A/C pressure sensor is hard mounted to a grounded metal line.
Possible internal short in it pulling down the common 5v reference signal from ECU causing a reduced power mode is my guess.
 
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