Member Since: 18 Dec 2016
Location: East Yorks.
Posts: 26
Transmission fault message.
Hi.
I have a 2005 TDV6 Disco 3 Auto. When I turn the key to start it I get a transmission fault message on the dash which goes off after a couple of seconds.
I've read the fault codes with a snap on solus found P173E Ignition key lock solenoid circuit low.
Apart from the light the car drives fine in auto and tip, all terrain settings work etc.
I can't find anything online about this fault and not entirely sure why this would come under the heading of transmission but hey!!
Has anyone had any experience of this and can point me in the right direction.
Thanks in anticipation.
21st Dec 2016 7:31 pm
L319
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2083
Low battery?
21st Dec 2016 8:55 pm
R5cpk
Member Since: 18 Dec 2016
Location: East Yorks.
Posts: 26
Battery tested and all ok. Bought another battery just in case but fault still there.
21st Dec 2016 8:56 pm
L319
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2083
I also had a faulty Alternator giving these start up messages.
22nd Dec 2016 8:22 am
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
SAME FAULT
Hi
Did you ever get this fault fixed, we have the exact same problem on a 2006 Range Rover sport, put a battery on today but still no joy. There is not much on the web about this fault. Hope you sorted it. Regards
31st Jan 2018 8:52 pm
R5cpk
Member Since: 18 Dec 2016
Location: East Yorks.
Posts: 26
Yes, I sorted it. Do you have the exact same issue??
31st Jan 2018 9:16 pm
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
Ah that’s good to know mate well done, what was it?
Yes we have the exact same symptoms as you described with your disco, starts up and says transmission fault but drives absolutely fine in all modes, p173e is the only code that won’t clear. Hope you can help. Thanks in advance
31st Jan 2018 9:40 pm
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
Sounds like it's either a fault with the shifter mechanism not allowing the key solenoid to release or it's an issue with the key solenoid itself.
The DTC is for Ignition Key Lock Solenoid Circuit Low as in short circuit to ground on the solenoid output from the transmission.1972 Range Rover Classic 2 door V8
2013 Land Rover Discovery 4 HSE - SCRAPPED
2016 Land Rover Discovery 4 Landmark
2022 Volvo XC40 T5 PHEV 282HP FWD 3 cylinder!
1st Feb 2018 10:04 am
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
Thanks for that, do you know if the key solenoid is the one with the interlock system and also are they easy to change. Thanks in advance
1st Feb 2018 10:11 am
R5cpk
Member Since: 18 Dec 2016
Location: East Yorks.
Posts: 26
The key lock solenoid is what stops you removing the key from the ignition when the car is not in park. Can you remove the key with the car in drive?
Using a wiring diagram I traced the fault on my car back to a corroded wire in the drivers footwell. If you pull the carpet back there’s a multi plug. If I remember rightly the key lock solenoid wire was blue. On mine it had corroded either side of the multiplug. Joined it back together. Fault went away. Spent ages finding the problem and bought parts unnecessarily based on bad advice. In the end it was a 10 minute, free repair!! Good luck.
1st Feb 2018 1:06 pm
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
Thank you so much mate that really helps as we have tried a new key lock solenoid today with no joy. Yes the key comes out when in drive so I’m going to check the wiring as you’ve advised and will let you know. Thank you again
1st Feb 2018 1:33 pm
Tim_1087
Member Since: 31 Jan 2018
Location: Sheffield
Posts: 6
Quick update
So we traced all the wiring back and checked the footwell which was all fine, then spoke to my Land Rover tech who looked into it and said check the ecu the one that’s behind the battery, and there it was the pin was corroded and broke. Just tried the new ecu and it works all fine, no light key will not come out in drive so result after 2 days of nearly stripping most of the inside.
Thanks
1st Feb 2018 8:42 pm
YankeeRoverGuy
Member Since: 26 Feb 2024
Location: Florida
Posts: 2
Looking for wiring diagram
TigerRecovery wrote:
Sounds like it's either a fault with the shifter mechanism not allowing the key solenoid to release or it's an issue with the key solenoid itself.
The DTC is for Ignition Key Lock Solenoid Circuit Low as in short circuit to ground on the solenoid output from the transmission.
Am chasing this problem down - P173E code: Ingition key lock solenoid - circuit low. Truck otherwise runs awesome. Message center "transmission fault" intermittent and when illuminated, falls off in seconds.
Drive selector changed (with known good unit) - no change
All network plugs, wires, cleaned and checked under center console - no change
TCase module inspected, cleaned, multiplugs, too - no change
Fob battery is dead. Key does not pull out when in drive.
I have another ignition lock solenoid... are they plug and play or need to be reprogrammed? Or am I lucky and it's a dead fob battery?
Any other wire diagram or experience would be helpful. TY from across the pond!
26th Feb 2024 9:11 pm
YankeeRoverGuy
Member Since: 26 Feb 2024
Location: Florida
Posts: 2
2006 Range Rover Sport Message Center Transmission Fault Fix
Click image to enlarge
Hi All -
I have solved this issue on my truck and wanted to offer more comprehensive details than what's readily out there.
I used to be a Land Rover tech - the golden years of LR (48-98) - and while retired now I don't have any of the diagnostics I used to have, so I resorted to instincts first, throwing parts at it second, then brute force old school muscle in the end.
My intermittent "Transmission Fault" on the message center presented the same as everyone else's.
The big clue to me was knowing that this is essentially a 5v feature, but measured 2.4v with real-time data.
For the novices out there... that means... you go looking for the small wires. Not the big ones.
Anyway... here's the rough steps I took to resolve:
- new battery (no change)
- cleaned all plugs in center console & swapped shift control/gear lever box (no change)
- tried two other transfer case control modules and rewrote vin (at a buddies shop - no change)
- tried two ignition interlock solenoids (on the LH side of the switch assembly - no change)
- but that's where I found the suspicious looking dark green/blue wire and I went looking deeper
- following the attached wiring diagram (note the ignition switch to ground in the TCCM on the bottom), mid ground there is a connector... the lightest grey one in the pic... closest to the firewall
- totally rotten, I bypassed the connector with the red wire spliced in
- little Timmy is all better now
Also... this is a LHD example NAS spec. But I would think all models and LR3's too would be similar.
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