2010 Escalade Hybrid No Crank NO Start

Alan Mechanic Manchester, Tennessee Posted   Latest   Edited  
Question
High Voltage - Hybrid & Electric Vehicles
Electrification
2010 Cadillac Escalade Hybrid 6.0L (J LZ1) 4-spd (2ML70)
P0633 - Immobilizer Key Not Programmed - ECM/PCM
No Crank / No Start

Customer brought me a escalade hybrid that he purchased not running, vehicle been sitting for a while apparently. Vehicle has been tampered with by many unqualified persons from the looks of things. He felt it was a security issue.. I did see that the VTD module had a unknown calibration. I was able to reflash main modules and security light is out. My scanner does not show the security preventing truck from starting but I have a code P0633. When I attempt to crank the truck my ignition voltage drops completely out. Any ideas what this may be? Does this truck have a starter in same regards as a 6.0 non hybrid? I've been told that the code P0633 will clear once the truck starts. Is this true? This truck had 60 plus codes in it and I'd say the hybrid system is in need of replacement or serving as well but don't think that would prevent truck from starting. Thanks Al

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Interesting
Matt Technician
Lawrence, Massachusetts
Matt Default
   

Hi Alan, The truck DOES NOT have a convential 12 Volt starter. The engine is cranked by a high voltage motor/generator. Can you post the hybrid codes? This may give a better direction for the no start. Do any of the code descriptions mention the interlock circuit?

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Alan Mechanic
Manchester, Tennessee
Alan Default
 

Hi Matt, thanks for reply, Yes I have that code and many others, I was just researching this U1888. Here is a list of relevant codes P0633 P0AC4 P1AE2 P1B05 P1B06 U1862 U1866 U1888 P0LOL < joke

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Matt Technician
Lawrence, Massachusetts
Matt Default
 

I would first concentrate on the interlock codes. The interlock circuit is a safety system for the high voltage components. If the computer detects an open in the circuit it will prevent the truck from going into Ready mode and starting the engine. I would first check the plastic inverter cover on the passenger side of the engine compartment. There's a shorting bar on the inside of the cover…

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Alan Mechanic
Manchester, Tennessee
Alan Default
 

thanks Matt, I noticed someone had been in that box and not all the screws were replaced? I haven't opened it myself but will take a look and let you know what I find.

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Babu Owner/Technician
McLean, Virginia
Babu Default
 

Test the regular battery first

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David Diagnostician
Philadelphia, Pennsylvania
David Default
 

Hey Alan, as a hybrid repair tech we see a ton of these trucks. Always start with the basics first, eg. 12volt system. Then get the interlock codes situated and then see where you stand. These trucks can be quite costly to repair but when they work they work good.

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

The motor is cranked by the transmission.

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Scott Owner
Moreno Valley, California
Scott Default
 

Hi Alan, Have you seen PIT4585F? Have you accessed the Serial Data Gateway Module (SDGM) to see if it reports "Crash Sense Failed"? And, of course the 12V battery needs to be good, and...If unqualified people have attempted repairs... I'm not seeing a P0663 listed for this vehicle.

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Alan Mechanic
Manchester, Tennessee
Alan Default
 

Hi Scott, I read about this last night and plan to check for this tomorrow. I didn't have a chance today to work on it anymore today. I'll post my findings. The P0 code is P0633, Sorry I must have typed wrong above but the code only came up after flashing the VTD and I did a successful relearn after flash. I had read this code will remain until the truck starts its next run? My Theft module…

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

Alan in my experience you are correct. The P0633 usually disappears when the car has a successful crank and start up event. Obviously I am not in front of the truck but I dont believe the immo is the problem at this point.

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William Technician
Morgantown, West Virginia
William Default
 

Caleb is correct. From #PIT4660B “You may experience a vehicle that has a P0633 DTC set in the ECM. Also, the Tech 2 will not be able to clear the DTC. DTC P0633 will set as an indicator that the ECM is in learn mode and not as a fault indicator. Any malfunction that causes a no crank condition will prevent DTC P0633 from clearing. DTC P0633 will clear upon a successful engine crank and start.“

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William Technician
Morgantown, West Virginia
William Default
 

Refer to #PIT4811C for correct troubleshooting. First, P1AE2-P1AE4, P1B05, or P1B06. Second, U-codes for power train expansion bus or high speed gm lan. Third, 12 volt low voltage concerns.

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William Technician
Morgantown, West Virginia
William Default
 

From what I can infer. You have an open condition or high resistance in the interlock circuit of the battery energy control module. This unit is located inside the case of the hybrid battery. Extreme caution must be taken if the case is removed as high voltage is always present and SI procedure must be followed to the T, along with the correct use of PPE. Complete hybrid battery unit replacement…

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Alan Mechanic
Manchester, Tennessee
Alan Default
 

thanks William,

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Alan Mechanic
Manchester, Tennessee
Alan Default
 

Sorry been a while on update, Good news is I fixed it. The battery interlock under the rear seat had been tampered with and wasn't married. Plus side, all his modules have been updated and battery pack is 285Volts. Only bad news is his engine is rattling like a box of rocks... Thanks again for all the excellent help. I'm sure I'll post something else soon.. Regards

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