P1775 and P0730 on 98 P38 please point me in the right direction
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1st Gear
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P1775 and P0730 on 98 P38 please point me in the right direction
P1775 and P0730 on 98 P38 please point me in the right direction Dtc’s = P1775 Gearbox has signaled a fault & P0730 incorrect gear ratio The P0730 is always present I can clear the codes and MIL will remain off for some time But after a while a day sometimes two the P1775 shows up and the MIL illuminates once again Could someone please point me in the right direction unsure where to begin….
2nd Gear
Joined: Dec 2011
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P0730 & P1775 Error codes
I have a 98 Range Rover SE and it is failing emissions for P0730 & P1775 Error codes. Had it to Transmission shop and they have checked everything out and found nothing wrong. Only thing I found on a site was that it could be the thermostat so I changed that but still no Joy. Any help would be appricated
Pro Wrench
Joined: Feb 2008
Posts: 1,706
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From: Meridian, Idaho
I've gotten P1775 before, cleared it and it never came back. In your case there is probably something wrong. Could just be a sensor problem. Came across this little article: Land-Rover P0730 OBD/DLC Error Code - Incorrect Gear Ratio
They listed a number of possibilities. If it were me, I might consider replacing the TCM. Second hand units are fairly cheap. However, the TCM might not be causing a problem either... Have you cleaned the connectors on the TCM?
BTW, who told you it could be the thermostat? There is nothing "connected" to it, the only way it affects the transmission is through temp regulation of the engine, which doesn't directly affect the transmission. If you had a thermostat problem, your engine would be overheating, not throwing transmission faults. MAF sensors have been known to cause weird transmission problems, but if that were malfunctioning then your engine would be running strange.
They listed a number of possibilities. If it were me, I might consider replacing the TCM. Second hand units are fairly cheap. However, the TCM might not be causing a problem either... Have you cleaned the connectors on the TCM?
BTW, who told you it could be the thermostat? There is nothing "connected" to it, the only way it affects the transmission is through temp regulation of the engine, which doesn't directly affect the transmission. If you had a thermostat problem, your engine would be overheating, not throwing transmission faults. MAF sensors have been known to cause weird transmission problems, but if that were malfunctioning then your engine would be running strange.
Last edited by LRScott; Dec 9, 2011 at 09:14 PM.
Three Wheeling
Joined: May 2011
Posts: 77
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From: Northen Virginia
If your truck transmission seems to work okay -
Clean or replace your MAF (Mass Air Flow/ Inlet Air Temperature Sensor). A good spray with electrical contact cleaner worked for me. Two screws hold it in place, it looks mechanically fragile so handle gently - but giving a few hard shots of cleaner should do it.
I know... but I had a similar problem truck failed emissions test, but seemed to run okay, and this resolved it. How I think this is, is: The ECU gets erroneous info from the MAF the resulting speed/power is out of range from the expected value, it faults.
Clean or replace your MAF (Mass Air Flow/ Inlet Air Temperature Sensor). A good spray with electrical contact cleaner worked for me. Two screws hold it in place, it looks mechanically fragile so handle gently - but giving a few hard shots of cleaner should do it.
I know... but I had a similar problem truck failed emissions test, but seemed to run okay, and this resolved it. How I think this is, is: The ECU gets erroneous info from the MAF the resulting speed/power is out of range from the expected value, it faults.
Last edited by Ringo; Dec 14, 2011 at 12:31 PM.
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