P1755 dtc

[GrantP]

The check engine light just popped up when I started the truck this morning, P1755 (transmission throttle valve actuator), no other codes. The truck now won't shift into second gear until ~2600 rpm although the upper gears seem to be behaving normally.

Most of you will probably understand this but I could just tell there's been something going south when I start the truck lately. The starter cranks over a little slow and the truck is sometimes reluctant to actually start and my tachometer is flaking out, it's only reading 400 rpms at idle. The tach thing is apparently common on 06's so that may not be related. Doing some research on this site and others I see a lot of people mentioning batteries as the culprit for the DTC. My batteries are 5 years old so I have ordered new ones this morning as a preventive measure but new batteries seem to have fixed the problem for some. The existing ones are on the charger now until the new ones arrive.

My question is whether or not any of you in TDR land have corrected this specific DTC with new batteries or do I have a TTVA problem? Is there a way to test the TTVA?

Thanks in advance.

 

[GrantP]

Well, disconnected the battery cables and charged both batteries. Reconnected the cables then cleared the code. Took it for a quick trip (maybe a mile) and transmission shifted fine. Hopefully it's just batteries (which I needed anyway). Tach is still flakey.

 

[sag2]

Nice to hear. The tach problem is a pretty easy fix if you find the right video. That is assuming you can solder.

 

[GrantP]

Well I got a new code two days later, P2509 ECM/PCM Power Input Signal Intermittent. That pretty much confirmed my suspicion of the batteries. UPS finally showed up with the batteries and I cleared the code. Truck now starts immediately and zero codes after putting three hundred miles on it over the weekend.

Hope this helps someone searching either of those codes on the forum. Lesson learned, old batteries do bad things to electronic trucks. Glad it was something simple.