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Old 02-03-2019, 05:35 PM   #1
TROLL
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Default P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Earlier this year I purchased an 06 Sprinter (07 Winnebago View, actually).
The transmission was replaced roughly 40k miles ago with a rebuilt unit by Silver Star Transmissions. It drove well, although during the pre-purchase inspection the experienced tech could tell it had been rebuilt and was not an OEM unit due to some vibration he felt. It was subtle though and I never really noticed much.

Fast forward 6 months and I just hit the road, with a one-time flat tow of my 97 Wrangler from FL to CO. The route is mostly flat, except for a 6% grade over a pass in TN where I was maintaining about 45 mph over a 2300' rise in elevation.
Shortly after this climb I got a CEL with a P0740 error code and also noticed for the first time a "rumble strip noise" at a couple different spots in my driving. If I left off the gas or press the gas pedal in more it goes away usually. At one point it resonates very badly with what I think is the factory jack and makes a very loud rattling noise, but other times it just really does sound like I'm driving over the rumble strip on the side of the road.

I continued my drive to CO which was mostly drama free, except for the rumble strip noise and the CEL on the dash. I have not reset the codes yet, waiting to decide what my next move is. I do hope to continue driving this cross country though and want to try and avoid being stranded in the middle of nowhere! I do not plan to flat tow any more, but I do plan to drive in and out of mountain passes.

Not finding a whole ton of info on the P0740 code or what if any action I should take so figured I'd start a thread here and see if anyone had experience with this.

(Also have a recurring glow plug P0380 and P0671, and a new 02 sensor P2A00 code, but I don't believe any of these would be related).

Thanks!
Bryan

Last edited by TROLL; 02-03-2019 at 06:03 PM.
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Old 02-03-2019, 05:39 PM   #2
Cheyenne
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Your P0740 code translates as 'Torque Converter Clutch Circuit/Open' so it may be time for a trans service as a starter unless anyone else knows more.

Keith.
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Old 02-03-2019, 05:44 PM   #3
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Most likely the torques converter solenoid is out, maybe the gallery pressure control solenoids as well!
A scan interrogation will show up what is working and what is not including pressures by looking at clutch pack fill time operation.
Dennis
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Old 02-03-2019, 05:46 PM   #4
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Quote:
Originally Posted by TROLL View Post
The transmission was replaced roughly 40k miles ago with a rebuilt unit by Silver Star Transmissions.
Say no more. There is no such thing as a correctly rebuilt transmission. They are too complicated to rebuild in the aftermarket, and impossible without the full specs and tolerances and manufacturing procedures - which no OEM will provide to a re-builder - or anyone else.

Take good care of your OEM unit. If it fails, get rid of the entire vehicle, IMO.
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Old 02-03-2019, 06:09 PM   #5
ptheland
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Are you still in Colorado? Dennis (Lindenengineering above) has his shop in the Denver area.
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Old 02-03-2019, 06:14 PM   #6
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Yes, in Lakewood, CO -- will have to send a message, thanks!
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Old 05-23-2019, 05:13 PM   #7
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

Bryan - what became of this? Thx ~
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Old 05-23-2019, 05:32 PM   #8
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Default Re: P0740 Error Code and Rumble Strip Noise after flat towing Jeep up steep grade

I took the vehicle to Linden in order to get the transmission codes so I had more info -- they scanned the vehicle and drove it and based on their diagnosis they recommended replacing one solenoid and the main board, plus a fluid change in the process. Labor was $450 and parts were about $750. Unfortunately I didn't get the actual transmission codes from them which kind of defeated the purpose of my trip, but I didn't specifically ask for them before I left so I'll take responsibility there.

I haven't done anything as I shifted my focus to a coolant loss issue that has led me deep into a head gasket change and head repair. Before I started that I had the vehicle at the MB dealer and they scanned and I guess cleared my codes. The tech said he didn't notice any vibration from the transmission. When I got the vehicle back the codes were cleared and I don't notice any vibration from the transmission either. Strange... but at this point I plan to do a fluid change because its about due, and hopefully the vibration and CEL won't come back. They probably will though, and I'll just have to address it when they do.
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