After a reset, the ecu probably still has to complete a cycle before it will pass an OBD test. I really doubt unplugging the battery does a reset.
#2005 pontiac vibe torque converter clutch solenoid location code#
If you reset the code with a scan tool, I'm pretty sure it's dumped from the ecu. If your light is lit (or if the code is still in the ecu), you flunked and can't get reregistered. The situation is that many areas(like here) have annual emission inspections which basically just scan for codes on OBD cars. Before LTC, all automatic trans slipped by design. At worst if the LTC stops locking up completely, your hwy mpg will drop slightly. Like I said above, chances are it's a slight slippage in the lockup torque converter, which is no big deal. The control valve bodies in these Aisin A246E trans are surprisingly easy to remove on the car, but we won't go there. Numerous issues with the control valve body components can cause LTC malfunctions, like the famous pressure control valve solenoid. One TSB I came across for the Toyota Echo (remember Echo) pulled the transaxle and LTC, then inspected an oil seal inside the LTC that apparently keeps pressure on the lockup clutch. there are, of course, several other failures that will throw this code.
I could lose a lot of fuel economy before paying for a $1500 trans rebuild. Hopefully, this will fix the problem if I cooked the ATF after 135k of desert driving. I may do it twice, since I'll only be getting 3 out of 8 qts each time. Inspect the magnets and pan for residue, clean or replace the screen and put in fresh type I-IV Toyota fluid. Mine was off for almost a year.ĭespite the little label on my trans dipstick that says the ATF is good for life, and it looks clean, but a little brown, I plan to drain it and drop the pan. If it looks like the LTC is acting normally, then it probably is occaissionally slipping under severe conditions. If it fails, the trans won't lock up.Īnyway, the driving conditions when the CEL comes on are important to diagnosing the problem. If it's acting up, like sticking, it impacts shifting and causes other, more noticeable problems. This solenoid valve is the one everyone zeroes in on for this code, and surprisingly, unlike the shift solenoids, it doesn't have its own electrical failure (open-short) code. The lockup clutch on the torque converter is hydraulically activated by a lockup valve which is apparently electrically controlled by the trans pressure solenoid valve. When the LTC goes into lock while accelerating on a highway, it feels and looks on the tach like going into a mild 5th gear. The test for a stuck off LTC is to drive the car warmed up over 50mph at a steady speed, then push down on the gas a bit, if the tach rises quickly, the LTC is Stuck off because the trans isn't locked to the engine when it should be.
Even then, the only impact is a small decrease in mpg, the sole purpose of the LTC. This isn't a big deal until the LTC eventually fails to lock up / stuck off. The ECU compares the engine rpms to the trans input rpms and throws a code if they don't closely agree due to slippage in the LTC. I suspect 3 is the most common and shows up at high speed under load. This code is triggered: 1-if the lockup torque converter LTC is stuck off, 2- LTC is stuck on, 3- LTC is slipping. Both times the car was being driven on the highway around 80mph in hot weather (110F). I strongly suspect it was the same code and cause. The first time was 11 mos ago and I was on a road trip with no tools and the code reset itself on the next cycle before I found out what it was. This is only the second time this car threw any code. Reset it but according to the service manual, it takes two strikes / malfunctions to trigger the CEL, so I haven't seen it back yet.
Just had this code come up last nite and researched it.
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