Poor shift quality at low speeds--jerks when downshifting
What is your question?
2004 Lexus LS 430 300K miles--transmission jerks when downshifting during deceleration (approximately < 10mph). The RPMs kick up when it happens. I've heard that a software update can solve the problem. I took it to a highly recommended repair shop--replaced #2 solenoid and new Toyota transmission fluid for $700 to no avail. Still jerks; very annoying. No leaks or noises other than "thump" with it downshifts....
Any help would be appreciated.
What makes this problem better or worse?
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How long has your 2004 Lexus LS430 had this problem?
RepairPal Certified shops can diagnose and repair your 2004 Lexus LS430. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
The problem is your Engine Control Module... ECM... located beside your fusebox under the hood. - I sent mine off for repair to SIA Electronics in Tilden, IL and got it back fully repaired in less than 10 days for $115 total. It totally fixed the jerking between 2nd gear and 1st gear when slowing down. Saved me $3,800 for a rebuilt transmission that WOULD NOT HAVE FIXED THE ISSUE. It wasn't the transmission at all.
www.siaelec.com or Call 618-587-3308
Look on ebay - https://www.ebay.com/usr/zkboys?_trksid=p2047675.m3561.l2559
