2022 TOYOTA SIENNA Electrical System Problems

The wiring harness connector for both lights has had water accumulate in the connector which causes the rear tail lights to fail. Both of my tail lights have failed, and the cause was corrosion inside the wiring harness connector. I had to replace the wiring harness and connectors on both sides, driver, and passenger And I had to pay out-of-pocket. The dealer said that this problem is common on 22 sienna's and I have seen other 22 sienna's with out their driver and passenger rear running lights burnt out.

Pre-Collision System Malfunction, Hybrid System Malfunction, AWD System Malfunction suddenly when restarting the vehicle. Towed to Toyota of Downtown LA dealership. Toyota of Downtown LA Service tells me that the CPU on my relative new Sienna 2022 was fried from jump start when Sienna starting-battery was low. It was done by a AAA professional, I doubt that is the reason for the fried CPU. I believe Toyota engineers would not design/allow the CPU vulnerable to being fried from a jump start. This is a horrific design flaw if it is this way. This happens now, just 6 months after the 3 year warranty coverage. Toyota of Downtown LA Service is telling me it is going to cost me $2900 to replace this CPU. I find this unacceptable.

When break to slow down the car it accelerate instead.

05/13/23 - Hybrid malfunction, battery consistently dies/won't take a charge. 06/01 - 28/25 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery not charging. 06/09/23 - Van will not start; towed to Steet Toyota. Street confirmed numerous codes, AC issues. 06/27 - 07/06/23 - Van had to be taken to United Access, Albuquerque. 09/01/23 - 12/14/23 - Windshield wipers go off & run dry, cannot stop it & randomly happens. 10/11/23 - Hybrid malfunction, battery continues to die/won't take a charge. 10/23/23 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery not charging. Towed to United Access at personal expense. 11/12/23 - Picked up van from United Access repairs (dropped off 10/23/23). 12/08/24 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery not charging. Towed at personal expense. 12/08/24 - 01/15/25 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery dies/won't accept a charge. Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery dies/won't accept a charge; confirmed numerous codes. 05/24/24 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery issues. Windshield wipers still malfunctioning with no apparent cause. 07/25/24 - Hybrid malfunctions, confirms malfunctions & charging issues. 07/29 - 08/10/24 - Hybrid malfunction, Advanced Detection System Malfunction and Sonar Malfunction, ABS malfunction, Seatbelt malfunction, battery issues. Windshield wipers still malfunctioning with no apparent cause. 08/19/24 - Hybrid, Advanced Detection System, Sonar, ABS, seatbelt & battery dying. More issues.

The complaint was the failure mode of a no start condition while traveling. The issue was related to partial or improper function of the DSM which caused a drain on the battery and battery cell damage requiring full replacement. The fix was a software update to prevent recurrence which cost several hundred dollars (according to the Toyota Service Bulletin or TSB-0089) along with approx $200 for diagnostic analysis. The TSB work would have been covered if we had not exceeded 36,000 miles. We had the vehicle for 3 years and 1 month. I do not understand the mileage impact to the coverage of a firmware update as this was related to a no start condition and could have occurred when we stopped at a rest stop area as we were traveling across country at the time. I am very disappointed with the failure and the impact of getting several jump starts for our vehicle as well as the couple days waiting to get scheduled into a dealership and 4 hours to get fixed.

What component or system failed or malfunctioned, and is it available for inspection upon request? Toyota Integrated Dashcam, and yes its available to review. How was your safety or the safety of others put at risk? None Stop beeping Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, was replaced once under of warranty and failed again. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No, failed again after 30,000 miles

WHILE STOPPING AT TRAFFIC LIGHT BEHIND OTHER CARS AND BRAKING ON SLIGHT DOWNSLOPE THE BRAKES LET OFF FOR A SECOND OR TWO, THEN RE-ENGAGED. FELT LIKE WHEN YOU HIT AN ICY PATCH OR OIL SPOT ON PAVEMENT. THE 2022 VEHICLE IS UNDER 3 YEARS OLD AND HAS 10,539 MILES ON IT AND THIS WAS FIRST TIME THIS HAS OCCURRED.

Our 2022 Toyota Sienna would not start after arriving at a doctor’s appointment. Contacted active ToyotaCare for towing - no one showed up. Called a friend to jump start van; consulted the owners’ manual and performed jump. Van started but could only be driven about 100 yds in parking lot. Van stopped; multiple error codes showed up when trying to jump start again. ToyotaCare didn’t call again or show up so we ended up paying for tow service to the dealership - Haley Toyota of Richmond. Dealership checked vehicle; concluded the battery had an internal weld problem but that the jump start was not performed properly even though the manual was followed. There are no jump start instructions in the engine compartment. We were given a Tech Bulletin instruction sheet with more accurate information. We were advised the Engine Control Unit was burned out, causing all the error codes and would not be covered under warranty because “we” did not perform the jump start correctly. The cost of repair is almost $1100.00 but the battery, which started all the issues, is covered under warranty. The Tech Instruction sheet indicates to me that Toyota was aware of the inadequate jump start instructions and failed to inform customers of the possible issues. The Tech Instruction sheet we were given is dated April 6, 2022 - one month BEFORE we purchased the vehicle. The sheet lists all Toyota hybrid models as affected.

Ever since a tire was changed on the vehicle, it has had a recurring error message that states there is a malfunction in the tire pressure monitor system. As such, I rarely know the status of my tire pressure as the system has the malfunction at least 50% of the time. The car has been in service 2x for this issue and they have had it for close to 30 days and driven it all over saying they needed to drive it to make the error go away. They have replaced the sensors on the tire, nothing has worked and the problem still occurs daily.

Over the past 18 months, this vehicle has exhibited the following actions approximately 30-40 times. When slowing the vehicle, with brake pressure applied, the vehicle reacts appropriately until, at the slow speed( approximately 5-10 mph) it suddenly accelerates or surges ahead for approximately 1-2 seconds. The has occurred while in the process of turning as well as moving straight ahead. I have taken the vehicle to the dealer of the original sale, Shepard's Toyota, Thomaston Maine, and they have attempted to replicate this action. They were unable to do so. The reported to me that they contacted Toyota engineering and was told, I paraphrase, that when the drive battery is fully charged and the dynamic braking system is still creating a charge, the current is directed to the drive motors, despite the fact that the brake is applied to slow and stop the vehicle. These events have occurred inn the middle of turns, when attempting to stop at crosswalks, and stopping prior to entering a traffic stream. If I had not continued to apply the brake, the vehicle would have, in several case, collided with objects.

The TPMS sensors stop working when driving at highway speeds and won't tell you the air pressure. Says see dealer but when I take it there, they can't do anything. Has happened probably 10 times. Usually only on interstate. Can be safety hazard if tire pressure goes low and no idea.

This van was converted to be wheelchair accesible by Vantage Mobility International. My parents have repeatedly had an error arise that indicates an issue with the hybrid battery cooling system. This system was modified by VMI, in partnership with Toyota, to allow for the accessibility features to be added to van. Neither the vehicle dealer, Superior Van and Mobility in Knoxville, TN, nor the local Totota dealer, Toyota of Knoxville, have been able to rectify the issue, despite mutliple attempts.We are concerned that this is a safety issue, and have asked for written confirmation of that and for the issue to be resolved. None of the three parties, Superior, Toyota, nor VMI, have been willing to do that nor rectify the issue. (I have filled this out for my parents because this has already become so stressful and in the wake of my dad's rapidly progressing disability, I don't want either of them to have to deal with more of the headache with this.)