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4.4 V8: Lost Communication with Transmission Control Module
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redbadge
 


Member Since: 01 Apr 2015
Location: California
Posts: 6

United States 2005 LR3 4.4 V8 HSE Auto Chawton WhiteLR3
4.4 V8: Lost Communication with Transmission Control Module

Hi guys

I have a US spec 4.4 V8 LR3 with 180k miles on it. Sold engine and transmission always. Recently experience some weird issues of transmission, so looking to get some help here.

Symptoms:
Recently after I drive the car for more than 5 minutes and put it into P, it then wouldn't shift back to R or D. 5 seconds later, dash showed an E in transmission error and parking brake error. No EAS or other error was shown.

I have to turn off the engine, wait for 5 minutes and turn it back on again, and it would return to normal. Or if I unplug the battery and reconnect it it would be back to normal as well. However, the next cycle I put it into drive and then P, it wouldn't return to Drive again.

This doesn't happen when the car is cold, or at least every morning i back it out of the parking and change to Drive it works fine.

IID tool code shows everything got lost communication with transmission Control Module

Background on the car:
Interstate Battery 3 years old, well taken care of, soft charged to full every half year.
New negative battery cable 2 years ago
Transmission flushed with correct fluid 3 years ago, leaking sleeve replaced
Transmission cable checked no rust and adjusted
New transfer case ECU (behind the battery) placed 2 years ago. It was water damaged before. i checked the new one recently, seems to be all dry
Brake switch changed 3 years ago
Taillight bulbs all fine
Checked all fuses related to transmission and transfer box, all seemed to be fine
No evidence of center console water damage
both side of sunroof rubber drain was replaced (had to remove the CJB for the passenger side, didn't notice visible water damage)
New starter 2 years ago
New alternator 3 years ago

Suspection
I think this is something electrical not mechanical because if i restart the car it shifts normal and the gears shifts normal as well.
Some harness or wire getting rusted? (where do you think I should check)
Ground points got rusted?
The transfer case ECU harness rusted?

Sorry for the lengthy post. I couldn't think of anything else, running out of ideas. Any suggestion would be helpful! Shocked
  
Post #205501822nd May 2019 12:14 am
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

To me it sounds mechanical or brake light switch as to select a gear you need to press the brake pedal
  
Post #205509522nd May 2019 10:36 am
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redbadge
 


Member Since: 01 Apr 2015
Location: California
Posts: 6

United States 2005 LR3 4.4 V8 HSE Auto Chawton WhiteLR3

Update:

I replaced the shifter and another brake switch. problems still exists.
Also noticed sometime when taking off at a greenlight the transmission doesn't want to shift till 3-4 seconds later, it was like a slip and then the gear punches in and suddenly have a push.

Any idea?
  
Post #206188017th Jun 2019 10:36 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Second issue
I would check for low fluid.

Needs checking with engine running
  
Post #206190818th Jun 2019 7:53 am
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Sean LR3
 


Member Since: 24 Sep 2019
Location: Fairview
Posts: 4

United States 
Won't go in top drive with shifter

Did you solve this problem?
  
Post #208834330th Sep 2019 1:15 pm
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