mattmorgans
Member Since: 21 Sep 2023
Location: Bristol
Posts: 3
  
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| Completely stumped! Discovery 4 Gearbox Fault |
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Hi All,
Hoping someone out there might be able to help me with a major problem on my Discovery 4 L319 (2013) which I'm unable to figure out the issue and has stumped me!.
I bought the Discovery 4 as a Cat S from Copart but fortunately the chassis was straight and only the two front body mounts and inner wings were damaged which I replaced with cuts from another vehicle. I replaced all the other broken parts (bumper, rad pack, headlights etc) and got the vehicle fully running with no errors being reported from my IID tool. Got it MOT'd, taxed etc and had been driving around gently as I built up confidence in its reliability etc.
I decided to go on a longer journey to a nearby Machine Mart in Gloucester but disaster struck on the way home and I broke down (AA took 7 hours to recover me but that's another story).
The issue was that my rotary gear selector decided to go into Park and would not allow me to select anything other than P. The AA patrol man said that it was a common fault and that a solenoid in the selector breaks. I did some research a few days after the breakdown and was advised to send the selector off to ecutesting.com which I did, was advised there was a fault, they fixed it and returned it to me. I plugged the unit back in but it doesn't seem to have made any difference.
I've run a scan using my IID tool and have got the following faults;
L319 - Discovery 4 2013
Vehicle scanned on 01-03-2025 15:52
Using IIDTool BT V4.0 B0098
ABS-Brake Module
* U0101-00 (AB) Lost communication with transmission control module
( on 01-03-2025 15:51:06 at 195743 km )
ATCM-Terrain Response
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
BCM-Body Control
* B1D17-87 (2E) Bus circuit - Bus signal/message failure - missing a message
( on 01-03-2025 15:51:07 at 195743 km )
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
* B1088-86 (2E) LIN bus B - Bus signal/message failure - signal is invalid
( on 01-03-2025 15:50:19 at 195743 km )
* B1D17-83 (2E) Bus circuit - Bus signal/message failure - value of signal protection calculation is incorrect
( on 01-03-2025 15:50:05 at 195743 km )
GSM-Gear Shift
* P084F-15 (2F) Park/neutral switch output circuit - General electrical failure - circuit short to battery or open
( on 01-03-2025 15:51:51 at 195743 km )
* B1087-08 (2E) LIN bus A - General failure information - bus signal/message failure
( on 01-03-2025 15:50:07 at 195743 km )
* B1087-82 (2E) LIN bus A - Bus signal/message failure - alive/sequence counter is incorrect/not updated
( on 01-03-2025 15:50:07 at 195743 km )
* B1087-87 (2E) LIN bus A - Bus signal/message failure - missing a message
( on 01-03-2025 15:51:06 at 195743 km )
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:06 at 195743 km )
* U101A-86 (2F) Lost communication with transmission control module - Multiple bus - Bus signal/message failure - signal is invalid
IPC-Instrument Pack
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
PBM-Parking Brake
* U0101-00 (2B) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
PCM-Engine Diesel 3.0L
* P0850-64 (2A) Park/neutral switch input circuit - Algorithm based failure - signal plausibility failure
( on 01-03-2025 15:51:14 at 195743 km )
* P0700-00 (2E) Transmission control system (malfunction indicator lamp request)
( on 01-03-2025 15:50:09 at 195743 km )
* U0101-00 (2A) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
RLM-Suspension
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:07 at 195743 km )
TCCM-Transfer Case
* U0101-00 (2E) Lost communication with transmission control module
( on 01-03-2025 15:51:06 at 195743 km )
* U0402-00 (2E) Invalid data received from transmission control module
( on 01-03-2025 15:50:14 at 195743 km )
I've tried looking up a couple of the faults on Google but seem to be going round in circles.
Currently there are no lights to indicate what gear the selector is in and I'm unable to turn the dial. The engine runs absolutely fine but there also appears to be a problem with the Parking Brake.
Can anyone please help as I'm somewhat stumped and not sure what to do next!!
Thanks in advance.
Matt
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 1st Mar 2025 5:28 pm |
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NC500
Member Since: 18 Sep 2017
Location: On the NC500
Posts: 576
 
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I would suggest removing the unit (easy to do) and send it to Autotronics who will replace the faulty part of the selector and send it back to you. Takes about 4 days for a turnaround….
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| 1st Mar 2025 9:25 pm |
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Dawsy82
Member Since: 05 Apr 2025
Location: Cumbria
Posts: 1
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1. Check TCM Fuse and Power Supply
• Confirm TCM is receiving battery power and ground.
2. Inspect Gear Selector Module Wiring
• Especially for shorts to power or open circuits (related to P084F).
3. Check for Water Ingress
• Behind the battery tray, around the gearbox harness, and inside the cabin near the shifter.
4. Disconnect and Reconnect TCM Connector
• Clean pins, reseat, and clear codes to see if communication resumes.
5. If no fix: TCM testing or replacement likely needed
• A software reload or replacement and programming via SDD or equivalent may be required.
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| 4th May 2025 5:31 am |
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