Need Help, 07 Yukon Track/Engine Light On

Hector Owner/Technician Texas Posted   Latest   Edited  
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Driveability
2007 GMC Yukon XL 1500 Denali 6.2L (8 L92) 6-spd (6L80)
Track And Engine Light On

Good afternoon, I have an 07 GMC YUKON 6.2 that has code P0011 CMP system performance and C0561:71 ABS system disable.

The Yukon has been to a repair shop and then to the GMC dealer where they replaced all related internal timing components including camshaft !

the suv runs fine but feels sluggish, on the scan timing data it shows 45 and 9 degree timing fluctuating, it also has a new ECM and harness, with out tearing into the engine timing area i have re checked all connections, tested all related circuits and found nothing.

any input on this ?

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Interesting
Missing Tests
Joel Mechanic
California
Joel
 

You verified timing completely? Does engine have any evidence of sludge or other internal problems? What is the oil pressure to the switch?

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Jim Educator
California
Jim
   

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Helpful
Hector Owner/Technician
Texas
Hector
 

Hey Jim, yes i have an Autel, but i will post data tomorrow as i did not work on it today , thanks.

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Kerry Mobile Technician
Ohio
Kerry
 

Hi Jim, Can you expand a little on the Autel handicap? I would wholesale agree with the sketchiness of GM with autel but are you speaking of something specific to this platform or a missing capability/function?

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Jim Educator
California
Jim
   

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Geoff Diagnostician
Hawaii
Geoff
 

Kinda hard to follow the conversation when you delete all your posts, Jim.

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Marlin Technician
Oregon
Marlin
 

Probably he got in trouble.

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Robert Technician
Michigan
Robert
 

P0011 can be a serious DTC if current for one it takes 14 seconds to set and would be human error if timing is advanced ,DTC Enabling Criteria is something like - Whats camshaft desired angle Vs actual angle for DTC to set will be over 6 degrees … 45/9 is a 35 degree sweep specs needed that means nothing w/o the spec 0 point ,also have Desired vs actual camshaft position …timing components…

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Hector Owner/Technician
Texas
Hector
 

No noises, all GM parts . All new actuators, oil pump, I removed the magnetic actuator and did a ohms test good at 7.2 ohms, powered it and pushes strong. i verified actuator torque at cam, verified part numbers, all good. Must have loss of pressure some where but oil pressure on scan tool reads 42 psi at idle.

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Caleb Diagnostician
Indiana
Caleb
 

Need to know what actual and desired cam position is and if the actual moves at all. These engines are known for wiped #2 cam bearing casuing low oil pressure to cam sprocket/phaser

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Hector Owner/Technician
Texas
Hector
 

Ok, Would that show lower than normal pressure at oil pressure sensor ? i can commend 5-30 degrees and pid on scan tool shows 0. not moving at all other wise i would see an increase in rpm, i put a scope on the magnetic actuator and can clearly see the commend signal.

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Robert Technician
Michigan
Robert
 

Looks like your back to a brand new stuck actuator or no oil or a bad solenoid

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Hector Owner/Technician
Texas
Hector
 

Very possible, i replaced the magnetic actuator. but possible stuck phaser !. i will tear in to it. thanks.

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Brandon Diagnostician
Arizona
Brandon
 

Do you have a lab scope to use? This is a situation where I believe it is absolutely needed to verify timing and phasers operation.

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Jim Educator
California
Jim
   

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Brandon Diagnostician
Arizona
Brandon
   

Great question. From my point of view when you can't understand or believe the data you're scan tool is showing you especially with timing and timing controls a lab scope will validate what the pcm is seeing and its ability to output with the inputs it is receiving (or should be seeing) with an in cylinder analysis you can really see the whole picture. This is what I've come to learn and really…

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Marlin Technician
Oregon
Marlin
 

There is a real fault, likely related to oil flow/pressure. Do some analysis and post meaningful results. Statements such as “on the scan timing data it shows 45 and 9 degree timing fluctuating” isn't specific enough to be useful in helping you.

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Hector Owner/Technician
Texas
Hector
 

thanks, will do.

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Scott Owner
California
Scott
 

Hi Hector, I'm wondering how this ended up at your shop and not back to the dealer, or the other shop that did all that work? Do they have any money left? I say this in jest, but… As Marlin said I'm starting with oil - full, correct viscosity, correctly spec'd - what's the oil pressure? Is there sludge in the engine? As Jim, mentioned scan data is useful while commanding the VVT - commanded…

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Hector Owner/Technician
Texas
Hector
 

Hey Scott, well customer said that at the end, dealer suggested a new engine. Im not sure how that turned out but what i do know is that the engine also has a new oil pump, the oil is the right viscosity and no sludge. the oil pressure reads 42 psi at idle. When i commend the VVT the timing reading on the Autel go's from 0 to 45 / 9 fluctuating ! I really think that it is an oil pressure problem…

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Caleb Diagnostician
Indiana
Caleb
 

Can you post a video of the solenoid duty cycle, the actual and desired position PIDs on scan data. No one is really able to understands “0 to 45/9” unfortunately. You should have a VVT solenoid command PID that is 0-100%. Another PID Actual cam position in degrees. Another PID desired cam position in degrees. The position PIDs will be about 0-25° and may be in 5° increments.

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Hector Owner/Technician
Texas
Hector
 

Ok here it is, i also scoped the magnetic actuator and clearly saw the commend increments of 5 degrees. diag​.​net/file/f69yvodvq… ​

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Caleb Diagnostician
Indiana
Caleb
 

Thanks Hector, great info. Ill answer as best I can and then itll be up too you too make a diagnostic descision. So I had an 08 6.0 with VVT that had a VVT performance fault. The cam would move but at low speeds it had a hard time keeping the actual postion matching desired. When this happened the oil pressure was only about 15 psi on scan data. It had a wiped 2nd cam bearing causing low oil…

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Hector Owner/Technician
Texas
Hector
 

All good, the customer and i decided that re doing the other shops job would reveal the problem. thanks for your time.

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Robert Technician
Michigan
Robert
 

Good Luck were pulling for you on this .

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Hector Owner/Technician
Texas
Hector
 

Ill be sure to post fix, thanks for all the support.

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Hector Owner/Technician
Texas
Hector Resolution
 

Found problem to be a defective new cam actuator (phaser), Replaced it and suv runs great! Moving the phaser back and forth felt grinding, But i never understood the Autels timing reading 45/9 fluctuating.

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Thanks