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Replaced a broken ESM on a customers 06 Grand Cherokee

Customer Question
Replaced a broken ESM...

Replaced a broken ESM on a customers 06 Grand Cherokee (3.7). Since then, Codes P0700,P0607, U0002, U0404 keep reoccurring. Unable to communicate with ESM "Version not found in Database Version num: 241 Select closest Variant/Version

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

Codes as above. Yes, cleared NUMEROUS times

Mechanic's Assistant: Are you fixing your Grand Cherokee yourself? What have you tried so far?

Customers vehicle )I'm a certified Master Tech, 45 years experience. Electronic Shift Module was physically broken, she was unable to shift into park and just kept jamming it, rubber had warped and came out of track.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Just what I entered above, thank you!

Submitted: 3 months ago.Category: Jeep
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Customer reply replied 3 months ago
Still there?
Customer reply replied 3 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 3 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 1 hour by:
3/12/2018
Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Jeep
Satisfied Customers: 5,507
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicle
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

Hey how are you ,I will Try to Help you with This Issue

You mentioned the shifter ESM broken, was it replaced ? or you cleaned connection and but back in track and put back together and clear faults

we have to start with U0002 and then go from there, as you know , the other dtc could be collateral faults caused by the U0002 ,so we run thru the troubleshoot steps for U0002 and repair then clear faults and see if any comes back

there is tsb bulletin on this issue

PROBABLE CAUSES:

  • Electronic Shift Module (ESM) Shift Lever Assembly
  • Transmission Control Module (TCM)
  • Open or Shorted Circuits or Connectors

DIAGNOSIS:
1. Connect a capable scan tool and read all trouble codes from all modules. Repair any Transmission Control Module (TCM) or Front Control Module (FCM) CAN BUS codes first. Verify the scan tool can communicate with the TCM and the Electronic Shift Module (ESM).
--> If the scan tool is NOT capable communicating or reading the U0404 from the ESM, find a scan tool that can and retest.
--> If the scan tool is capable of communicating and reading the U0404 from the ESM proceed to the next step.

2. Visually inspect the Transmission Control Module (TCM), and Electronic Shift Module (Shift Lever Assembly) wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded or contaminated terminals.
--> If any problems are found make the necessary repairs and retest.
--> If no problems are found, proceed to the next step.

3. Disconnect the Shift Lever Assembly harness connector. Ignition on engine off. Using a 12-volt test light connected to the (F1) Fused Ignition Switch Output circuit and the (Z907) ground circuit. Verify the test light illuminates brightly.
--> If the test light does NOT illuminate brightly, use the wiring diagram to repair the malfunctioning circuit.
--> If the test light illuminates brightly, replace the Shift Lever Assembly (ESM).

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Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

RELATED VEHICLES: 2005-2007 Jeep Grand Cherokee, Commander 3.7L with NAG1 Transmission. Related vehicles have similar information.

SUMMARY: U0404 - Implausible Data received From ESM (Shift Lever Assembly)
Theory of Operation: The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.
When Monitored: Continuously with the ignition on, one valid CAN ID received at least once, and no U0002-CAN Bus Off Performance DTC present.
Set Condition: When the TCM detects an incorrect CAN ID from the Electronic Shift Module (ESM).

RELATED TSB.
TSB: 21-016-06 REV. A DATE: November 15, MODELS: 2005-2007 Grand Cherokee, Commander. SUBJECT: The shifter assembly now has serviceable components. It is no longer necessary to replace the shifter as an assembly.

TSB: 08-046-05 DATE: August 23, 2005. MODELS: 2005 Grand Cherokee with a 3.7L engine and a NAG1 transmission. SUBJECT: Generic Scan Tool - No Communication With NAG1 (W5A580) Transmission Module. OVERVIEW: This bulletin involves removal of an electrical wire (communication line) from the NAG1 (W5A580) EGS52 transmission control module jumper harness. A technician, using a Generic Scan Tool (not StarSCAN), may fail to communicate with the vehicle NAG1 transmission control module (TCM). This condition will occur only when certain (aftermarket) Generic Scan Tools are used to attempt communication with the TCM. This condition will NOT occur if the technician uses a StarSCAN scan tool.

Please Let Me Know if you can view file pdf file

Thank You
Chad Farhat
ASE Certified Technician

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Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

My experience with them is the Shifter ESM or The TCM module , that is after checking our wiring between the tcm and esm

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Customer reply replied 3 months ago
I replaced it with a Dorman part. I was able to communicate prior to replacing it. Would you please call me?
Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

Sure , i do not mind calling you ,it will cost you more money ,

but there is a button on screen for a call request ,so it will pop on my screen so the system can call you for me ,

but if we had communication prior ,you have more years on me :), could we have simply a failed new (dorman part )

dlc connector checked ?

can you communicate with any other modules ?

what scanner do u have on it ?

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Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

do we have power on pin #12 on esm

with key in run/ start position

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Customer reply replied 3 months ago
Snap on Solus Edge fully updated. Already exchanged the Dorman part once. All connectors good. Can communicate with ALL other modules. I can. Receive pdfs on my laptop. Not on my phone. On a service call right now.
Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

But still original TCM module ?

did you point out the tcm module side if we have power to esm and out of it to tcm module ?

just reply back when ready, do not promising anything but we try

if the esm and wiring and connector checks out that is the next step

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Jeep Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 3 months ago

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Thank You?Chad Farhat?ASE Certified Technician

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