2007 Toyota Sienna Transmission Problems

Your transmission cooler, which is integrated into your radiator, ruptured while driving, causing an immediate loss of power and engine overheating. The rupture allowed coolant and transmission fluid to leak into the engine compartment and contaminate the transmission. You were stranded on the interstate when this happened, creating a safety hazard in traffic.

Your 2007 Sienna stalled at a traffic light and you discovered the engine had no oil, which then leaked out immediately after refilling. A mechanic replaced an oil hose, but the engine began making abnormal knocking sounds and ultimately failed, requiring full replacement. After the engine was replaced, the transmission started shifting in and out of gear on its own while stopped, and jerking when accelerating in reverse. The transmission may need diagnostic service or replacement to resolve the shifting issues.

While driving on the freeway at 55 mph, your van started smoking from the rear with oil leaking out, and warning lights appeared on the dashboard. A mechanic found that the oil cooler hose had burst. After replacing it and driving 50 miles, the same hose burst again about 3 weeks later. You discovered this is a known recurring problem affecting many 2007 Siennas, and Toyota offers a special repair kit for it, though your van is now out of warranty coverage. The repair will likely involve replacing the oil cooler hose with an upgraded version or installing Toyota's specific repair kit designed to prevent this failure.

TL* THE CONTACT OWNS A 2007 TOYOTA SIENNA. WHILE DRIVING AT AN UNKNOWN SPEED, THE VEHICLE BEGAN TO JERK AND THE TRANSMISSION HESITATED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE IT WAS DIAGNOSED THAT THE TRANSMISSION FAILED. THE DEALER WAS NOT CONTACTED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND STATED THAT THE VEHICLE WAS OUT OF WARRANTY. THE FAILURE MILEAGE WAS 53,000.

AT MY 120,000 SERVICE, THE TOYOTA DEALER TECHNICIAN REPORTED A LEAKING FRONT DIFFERENTIAL. HE SAID IT WOULD TAKE 16 HOURS TO REPAIR. THE TECHNICIAN ALSO MENTIONED THAT HE HAD 3 TOYOTA CARS CURRENTLY IN THE SHOP FOR THE SAME THING. THIS SEEMS BEYOND COINCIDENTAL. CLEARLY, TOYOTA HAS A PROBLEM WITH LEAKING SEALS. THE DIFFICULTY TO FIX THIS PROBLEM TRANSLATED INTO A BILL OF $1,404.60 PLUS $31.79 FOR A RENTAL CAR. THE BILL MAY HAVE BEEN MORE: THE CAR'S RACK AND PINION WAS ALSO LEAKING, SO SOME OF THE LABOR WAS SHARED WITH THAT JOB. THIS AMOUNT SEEMS EXTREME AND EITHER TOYOTA HAS FAULTY SEALS OR, IF THIS IS A "NORMAL" WEAR AND TEAR ITEM AT 120,000 MILES, TOYOTA HAS MADE IT WAY TOO DIFFICULT TO FIX. EITHER WAY, THIS AMOUNT OF EXPENSE IS INORDINATE.

VEHICLE WAS PARKED ON SLIGHT INCLINE IN DRIVEWAY (NOT RUNNING). KEY WAS IN IGNITION, BUT VEHICLE WAS NOT RUNNING AND IT WAS IN THE OFF POSITION. FOUR YEAR OLD CHILD SHIFTED VEHICLE OUT OF PARK INTO NEUTRAL CAUSING IT TO ROLL DOWN A HILL AND IMPACT SEVERAL TREES (NO INJURIES). AFTER THE INCIDENT, WE HAVE FOUND THAT THE VEHICLE CAN OCCASIONALLY BE EASILY SHIFTED OUT OF PARK WITH NO KEY IN THE IGNITION AND WITHOUT APPLYING PRESSURE TO THE BRAKE PEDAL. MOST OF THE TIME IT FUNCTIONS AS IT SUPPOSED TO (AND WON'T LET YOU TAKE IT OUT OF PARK).

I WAS DRIVING MY HUSBAND TO WORK, WHEN WE PULLED INTO HIS WORK, ALL OF A SUDDEN I HAD SMOKE COMING FROM UNDER MY HOOD. WE SHUT THE VEHICLE OFF, I HAD OIL EVERYWHERE. WE COULDN'T TELL WHERE THE LEAK WAS. I HAD THE VEHICLE TOWED HOME AND THEN TO ELK GROVE TOYOTA. WELL IT TURNS OUT THAT THE OIL COOLER LINE BROKE. THIS IS A DESIGN FLAW IN 2007 TO 2010 TOYOTA SIENNA'S. THERE ARE TECHNICIAL SERVICE BULLETINS BUT NO RECALLS. I HAD TO RENT A VEHICLE BEFORE I COULD EVEN GET IT TO A DEALERSHIP. THAT BILL WAS $365. THIS IS MY ONLY VEHICLE. THE FIRST TIME EVER BUYING A TOYOTA. I RESEARCHED FOR 4 MONTHS BEFORE I BOUGHT THIS VEHICLE.

TRANSMISSION HAD BEEN HESITATING AT TIMES, BUT MECHANIC COULDN'T FIND ANY PROBLEMS. AT 60,400 MILES, THE TRANSMISSION DIED COMPLETELY AND WE WERE STRANDED FAR FROM HOME. THIS OCCURRED ON A WELL-MAINTAINED VEHICLE. BECAUSE IT WAS OVER THE 60 MONTHS/60,000 MILES WARRANTY, TOYOTA OFFERED NO ASSISTANCE. BETWEEN TOWING AND REPLACING TRANSMISSION, IT COST US $5900. EVEN THE MECHANIC WAS SURPRISED BY THE FAILURE AT SUCH LOW MILEAGE, AS TOYOTA SIENNA IS WHAT HE NORMALLY RECOMMENDED TO HIS CUSTOMERS LOOKING FOR A RELIABLE FAMILY VEHICLE. WE WERE LUCKY NO ONE IN OUR FAMILY WAS INJURED, BUT WE ARE EXTREMELY DISAPPOINTED WITH TOYOTA NOT STANDING BY ITS PRODUCT. IN HINDSIGHT, I WISH WE HAD PURCHASED THE HONDA ODYSSEY.

CAR STARTED HAVING PROBLEMS APPROX 55,000 MILES, LEFT ME STRANDED ON THE SIDE OF THE ROAD TWICE. FIRST TIME CHECK ENGINE LIGHT CAME ON AND STARTED TO STALL. PULLED OFF FREEWAY, CHECKED MANUAL AND IT REFERENCED ELECTRONIC THROTTLE CONTROL, SHUT OFF THE CAR AND RESTARTED AND WAS ABLE TO GET ON THE ROAD. CHECK ENGINE LIGHT CAME ON AGAIN, CHECKED CODE IGNITION COILS, HAD TO REPLACE #6. ANOTHER INSTANCE, CAR STARTED TO STALL, CHECK ENGINE LIGHT FLASHED AT ME, PULLED OFF THE ROAD. WAS ABLE TO TAKE IT TO DEALER IN WHICH THEY STATED THEY COULDN'T FIND A PROBLEM. NOW WITHIN DAYS MY CAR'S TRANSMISSION COMPLETELY WENT OUT, CURRENT MILLAGE 65, 987. TOYOTA WILL NO ABSOLUTELY NOTHING TO ASSIST BECAUSE ITS "OUT OF WARRANTY". ABSOLUTELY UNACCEPTABLE.

ON 11/12/15, THE RADIATOR BODY AROUND THE LOWER TRANSMISSION OIL LINE FITTING ON THE RADIATOR CRACKED, ALLOWING THE FITTING TO BREAK AWAY FROM THE RADIATOR. THIS CAUSED ALMOST ALL OF THE TRANSMISSION OIL TO BE PUMPED INTO THE RIGHT SIDE OF THE ENGINE COMPARTMENT. THE VEHICLE WAS BEING DRIVEN IN HEAVY RAIN ON RAIN SOAKED ROADS AT 55MPH ON SECONDARY ROADS WHEN SMOKE WAS OBSERVED. WHEN THE VEHICLE WAS STOPPED HEAVY SMOKE WAS COMING FROM UNDER THE HOOD AND BOTTOM OF VEHICLE, BUT NO FIRE STARTED. NO OIL LEAK WAS OBSERVED BEFORE THE INCIDENT (NO OIL ON GARAGE FLOOR). LEAK HAPPENED SUDDENLY AFTER APPROXIMATELY 3 MILES OF DRIVING. THE VEHICLE ODOMETER READING WAS 95,510.

I WAS NORTHBOUND ON INTERSTATE 15 IN UTAH AND NOTICED SMOKE COMING OUT FROM UNDERNEATH MY CAR. I PULLED INTO A FIRESTONE SERVICE CENTER WHERE THEY DIAGNOSED THE ISSUE TO BE A FAULTY OIL COOLER HOSE ASSEMBLY ON MY 2007 TOYOTA SIENNA MINI-VAN. I CONTACTED TOYOTA DEALER WHO SAID THAT THE PART HAD BEEN UPGRADED FROM A RUBBER HOSE TO A METAL HOSE THAT WOULD NOT BURST LIKE MINE HAD. I WAS NOT INFORMED OF THE OPTION TO UPGRADE PRIOR TO THIS INCIDENT AND IN FACT HAD HAD MY CAR INTO THE DEALER FOR AN OIL CHANGE THE WEEK BEFORE THIS INCIDENT. FIRESTONE SAID I WAS DOWN TO TWO QUARTS OF OIL REMAINING IN THE OIL PAN. I FEEL LUCKY THAT I DID NOT BURN UP MY ENGINE BY STOPPING BEFORE THE OIL PAN RAN DRY. ALSO, I AM LUCKY THAT I WAS DRIVING AND NOT MY WIFE WITH A CAR FULL OF KIDS AS THERE SEEMED TO BE A RISK OF A CAR FIRE BASED ON THE SMOKE. I AM WONDERING NOW JUST HOW SAFE AND RELIABLE MY CAR IS AND WHAT OTHER PROBLEMS TOYOTA IS AWARE OF THAT THEY HAVE NOT YET TOLD ME ABOUT ON MY YEAR MAKE AND MODEL. BY THE WAY IT KIND OF RUINED THE FAMILY VACATION WE WERE JUST STARTING.

UPON SLOWING DOWN TO TURN A STREET CORNER THE TRANSMISSION SLIPPED BEFORE IT WOULD GO AGAIN. IT SEEMED THAT IT WAS BETWEEN THE SLOWING DOWN AND RE-ACCELERATING AFTER THE TURN. THIS PROBLEM IS WELL DOCUMENTED ON GOOGLE BY MANY DRIVERS. THE DEALERS REPROGRAM SOME COMPUTER AND THEN DECLARE IT TO BE FIXED WHEN THE SAME PROBLEM OCCURS AGAIN. TOYOTA REFUSES TO FIX THE PROBLEM WHICH COSTS ONE ABOUT $3,000 TO ACTUALLY FIX IT BY REPLACING THE TRANSMISSION. I BOUGHT THE VAN AS USED. *TR

THE TRANSMISSION STARTED SLIPPING AND THEN WENT OUT COMPLETELY, CAUSING THE VAN TO BE UNABLE TO MOVE AT ALL. THIS OCCURRED ON A PUBLIC HIGHWAY. THE TRANSMISSION REQUIRED COMPLETE REPLACEMENT AT A COST OF OVER $5000.00. *TR

TL* THE CONTACT OWNS A 2007 TOYOTA SIENNA. THE CONTACT STATED THAT THE TRANSMISSION FAILED. THE CONTACT ALSO STATED THAT NHTSA CAMPAIGN NUMBER 13V429000 (POWER TRAIN) REPAIR WAS PERFORMED; HOWEVER, THE REPAIR DID NOT CORRECT THE FAILURE. THE CONTACT ALSO STATED THAT THE GEAR SHIFT WAS IN DRIVE HOWEVER, THE VEHICLE FAILED TO ACCELERATE. THE DRIVER ATTEMPTED TO SHIFT FROM REVERSE TO DRIVE AND WAS UNABLE TO RELEASE THE GEAR SHIFT. THE VEHICLE WAS TOWED TO THE DEALER, WHO PERFORMED A DIAGNOSTIC TEST THAT CONFIRMED THAT THE TRANSMISSION FAILED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE AND CURRENT MILEAGE WAS 127,000.

I AM THE SECOND OWNER OF THE VEHICLE. I WAS DRIVING ON INTERSTATE 5 AT 65 MILES PER HOURS FROM SACRAMENTO TO LOS ANGELES. THE TIME WAS 1600 ON 13 APRIL 2014. I DID NOT NOTICE ANY CRACK OR NOISE FROM ROAD DEBRIS DAMAGE WHILE I AM DIVING. THE RED LOW OIL WARNING LIGHT ON THE DASHBOARD DID NOT TURN ON AT THE TIME WHEN THE INCIDENT HAPPENED. I WAS PULLED OVER A REST STOP TO USE RESTROOM; I ALSO WALK AROUND THE VEHICLE TO CONDUCT A VISUAL CHECK AND FLUID CHECK AT THE SAME TIME. I WAS DISCOVERED ENGINE OIL WAS ALL OVER THE ENGINE BAY, UNDERCARRIAGE AND THE BACK LIFT DOOR DURING THE VISUAL CHECK. WHEN I CHECKED THE ENGINE OIL, THE DIP STICK SHOWED NO ENGINE OIL. AGAIN, THE RED LOW OIL WARNING LIGHT DID NOT TURN ON WHICH INDICATE LOW ENGINE OIL AT THAT TIME EVEN THE ENGINE HAD NO ENGINE OIL. VEHICLE WAS TOWED TO TOYOTA DEALERSHIP AND DISCOVERED AN OIL COOLER HOSE WHICH MAKE OUT OF RUBBER WAS RUPTURED. EVEN THE OIL COOLER HOSE WAS REPLACED WITH A METAL OIL HOSE; THE ENGINE WAS DAMAGED BY OPERATED WITHOUT ENGINE OIL FOR A SIGNIFICANT PERIOD. PRIOR TO THE TRIP, I PURCHASED THE ALL METAL VVT-I HOSE FROM A LOCAL DEALERSHIP, AGAIN NO WARNING FROM THE DEALERSHIP. I USED A LOCAL REPAIR SHOP TO REPLACE THE VVT-I HOSE LOCATE AT THE PASSAGE SIDE OF THE ENGINE TO AN ALL METAL PIPE SINCE I HAVE KNOWLEDGE ON THE RUBBER VVT-I HOSE HAVE THE SAME RUPTURE ISSUE. HOWEVER, I HAVE NO KNOWLEDGE ON THE T-SB-0201-11 WHICH IS THE TOYOTA TECHNICAL SERVICE BULLETIN TITLE OIL COOLER PIPE SEEP. THERE IS RECALL REGARDING SHIFT LOCK SOLENOID AND SEVERE CORROSION OF THE SPARE TIRE CARRIER CABLE ON THE 2007 SIENNA, HOWEVER, THERE IS NO RECALL ON POSSIBLE RUPTURE ON VVT-I HOSE OR OIL COOLER HOSE. IF THE RECALL WAS ISSUED OR AT LEAST WARNED BY DEALERSHIP, I WILL FIX THE OIL COOLER HOSE AT THE DEALER OR A LOCAL REPAIR SHOP AND AVOID THE ENGINE DAMAGE WHICH LEADED TO ENGINE REPLACEMENT. *TT

AFTER A SHORT TRIP, 5 MILES, I WAS BACKING INTO MY DRIVEWAY WHEN I NOTICED SOME FLUIDS ON THE CEMENT. I CHECKED THE LIQUID AND WAS NOT SURE IF IT WAS COOLANT OR TRANSMISSION FLUIDS SO I CALLED MY MECHANIC AND HE RECOMMENDED THAT I SHOULD HAVE IT TOWED IN .IT TURNS OUT THAT THE PROBLEM WAS THAT A CONNECTOR AT THE BOTTOM OF THE RADIATOR CRACKED AND WAS MIXING THE COOLANT WITH THE TRANSMISSION FLUID ,IT APPEARS THAT A DEFECTIVE FITTING WAS THE PROBLEM. IT COST ME $977.3 TO REPLACE THE RADIATOR AND FLUSH THE TRANSMISSION. MY MECHANIC SAID IF I WOULD HAVE CONTINUED DRIVING WITH THESE 2 FLUIDS MIXING I WOULD HAVE DAMAGED THE TRANSMISSION BEYOND REPAIR FOR A BILL OF $3,000. MORE IF THIS IS A COMMON PROBLEM ON THESE CARS PEOPLE SHOULD AT LEAST BE NOTIFIED WHAT TO WATCH FOR OR BETTER YET REPAIRED BY THE COMPANY. *TR

ON MON 10/22/2012 AT 11:15 AM I EXPERIENCED SUDDEN UNCONTROLLED ACCELERATION DRIVING MY VAN. I WAS TRAVELING ON I-696E IN DETROIT AT A CONSTANT 70MPH, THEN SLOWED TO 45MPH DUE TO CONSTRUCTION. AS TRAFFIC CLEARED THE CONSTRUCTION, I PUSHED THE ACCELERATOR PEDAL TO PASS A SEMI-TRUCK. I FELT THE ACCELERATOR CONTINUE TO DEPRESS, I COMPLETELY PULLED MY FOOT OFF BUT THE PEDAL DID NOT COME BACK NOR DID THE VEHICLE SLOW DOWN. RATHER, IT DID JUST THE OPPOSITE AND CONTINUED TO ACCELERATE. I ATTEMPTED TO BRAKE HARD WITH NO RESPONSE--THE VEHICLE DID NOT SLOW DOWN. THEN I PUT THE VAN IN NEUTRAL TO SLOW DOWN THE ENGINE WITH NO RESULTS, THE VAN CONTINUED INCREASING 60+MPH WITH NO FOOT ON ACCELERATOR. THIS IS WHEN I BECAME EXTREMELY FRIGHTENED. THE VEHICLE WAS PULLING FROM SIDE TO SIDE. I LOOKED DOWN TO SEE IF THERE WAS ANY INTERFERENCE FROM THE FLOOR MAT AND NONE WAS SEEN. I TAPPED GAS PEDAL - NO RESPONSE. NEXT I PUT VAN BACK IN DRIVE AND BRAKED --NO RESPONSE AGAIN. THEN I DOWNSHIFTED TO 4TH, THE ENGINE DID NOT SLOW, AND FURTHER DOWNSHIFTED TO 3RD GEAR. FINALLY, THE ENGINE RESPONDED AND SLOWED. I USED THE GAS PEDAL CAUTIOUSLY AS I THEN SHIFTED TO 4TH SO THAT I COULD EXIT THE FREEWAY. I PARKED AT MY OFFICE & IMMEDIATELY CALLED MY HUSBAND FIRST AND EXPLAINED WHAT HAPPENED AND I THEN IMMEDIATELY CALLED THE OUR TOYOTA SUBURBAN DEALER. THEY TOLD ME TO BRING IT IN FOR INSPECTION. I WAS STILL SHAKING WHEN I BROUGHT THE VEHICLE IN AND EXTREMELY UPSET. AFTER TWO INSPECTIONS, THEY STATED SUDDEN ACCELERATION WAS CAUSED BY THE FLOOR MAT. ALTHOUGH THIS SEEMS REASONABLE, IT DOES NOT EXPLAIN WHY BRAKES FAILED TO OVERCOME THE ENGINE, AND SHIFTING TO NEUTRAL FAILED TO DISENGAGE THE TRANSMISSION. THE VEHICLE SCARES ME TO DEATH. I DO NOT KNOW WHAT TO DO NEXT. I CONSIDER MYSELF A SERIOUS WITNESS AS A REGISTERED NURSE (RN/BSN) WITH 20 YR MANUAL DRIVING. REF TOYOTA CASE #[XXX] AND #[XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR

4 YR CHILD WAS ABLE TO SHIFT VAN INTO DRIVE WITHOUT IGNITITON KEY IN STARTER. WAS ABLE TO REPLICATE THE EVENT 30 MIN LATER AT HOME ONCE. WILL TAKE VAN IN TO DEALER FOR SERVICE. *TR

TL*THE CONTACT OWNS A 2007 TOYOTA SIENNA. THE CONTACT STATED THAT WHENEVER THE GEAR SHIFT WAS PLACED IN PARK, THE VEHICLE ROLLED FORWARD. THE DEALER WAS CONTACTED AND STATED THAT THERE WERE NO RECALLS OR RELATED WARRANTIES; HOWEVER, THERE WAS A PIECE THAT BROKE OFF THE LINKAGE WHERE THE GEAR BOX WAS LOCATED. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 63,000.

THE TRANSMISSION WAS DOING WHAT FELT LIKE "NEUTRAL DROPS" AT LOW SPEEDS, WHERE I WOULD SHIFT INTO DRIVE, GET THE "CLUNK" THAT I NORMALLY ASSOCIATE WITH THE TRANSMISSION DROPPING INTO FIRST, THEN DEPRESS THE GAS SLIGHTLY TO START MOVING. THE PROBLEM IS THAT THE ENGINE WOULD REV SUDDENLY, AND THEN CATCH FIRST, WHICH AS YOU KNOW, CAUSES A SUDDEN LURCH OF THE ENTIRE VEHICLE SINCE THE ENGINE HAD BEEN REVVING JUST BEFORE IT CAUGHT. IT WOULD ALSO OCCASIONALLY JUST "LOSE" THE GEAR WHILE DRIVING AT LOW SPEEDS. ON 6/12/2010 THE TRANSMISSION WENT OUT ON ME WHILE I WAS DRIVING HOME (WITH MY FAMILY) ON THE FWY (NORTH 5) FROM LEGOLAND. I HAVE TO ACROSS 5 LANES TO GET TO THE SHOULDER. I GOT THE VAN BRAND NEW ON 3/28/2007 (W/ONLY3 MILES ON THE VAN) FROM CARSON TOYOTA, CA...I PAID $28000 W/PACKAGE3 (OUT THE DOOR PRICE)...AS OF 6/12/2010 THE VAN HAS UNDER 14,000MILES. THE TOYOTA DEALER REPLACED THE TRANSMISSION WITH NO CHARGE (STILL UNDER POWERTRAIN WARRANTY). TRANSMISSIONS AREN'T SUPPOSED TO GO OUT THAT QUICKLY, IT DEFINITELY SEEMS TO BE A QUALITY CONTROL ISSUE. UNDER 14,000 MILES THERE HAS BEEN NO SERVICE DUE SO IT'S NOT A MATTER OF MISSING SCHEDULED MAINTENANCE. THIS IS OBVIOUSLY A VERY VALID SAFETY CONCERN. *TR

ON AUGUST 11, 2007, MY FAMILY EXPERIENCED A HEAD ON COLLISION. WE WERE DRIVING A 2007 TOYOTA SIENNA. MY HUSBAND WAS DRIVING AND DIED AT THE SCENE. THE INVESTIGATION NEVER FOUND ANY REASON FOR THE CAUSE OF THE ACCIDENT. MY HUSBAND CROSSED THE CENTER LINE WHILE GOING ROUND A SLIGHT CURVE. HE WAS 47, POOR WEATHER WAS NOT ISSUE. IF THE ACCELERATOR ON THE SIENNA MALFUNCTIONED AND DID NOT RESPOND, THAT COULD DEFINITELY HAVE BEEN A FACTOR. OUR VAN HAD LESS THAN 3000 MILES ON IT. WE PURCHASED IN MAY 11, 2007. THE AUTOPSY FOR MY HUSBAND CAME BACK NEGATIVE FOR ANY MEDICAL CONDITION CONCERN. PLEASE INVESTIGATE OUR ACCIDENT REPORT AND BE SURE THE SAFETY AND RELIABILITY OF SIENNA'S IS SOUND. UPDATED 03/10/10 *BF *TR UPDATED IVOQ 08/24/10 UPDATE 9/19/2011*CW

MY 2007 TOYOTA SIENNA ACCELERATE ON TURNS OR WHEN TRYING TO STOP. *CN

2007 TOYOTA SIENNA: TRANSMISSION TEMPORARILY FAILS TO ENGAGE THE CORRECT GEAR AFTER DECELERATING THEN RE-ACCELERATING RESULTING IN A PAUSE OR HESITATION BEFORE CONTROL IS AGAIN REGAINED. THIS OCCURS MOST FREQUENTLY WHEN SLOWING FOR TURNS AT INTERSECTIONS OR BEHIND SLOWING TRAFFIC OR ATTEMPTING A LANE CHANGE. THREE SERVICE CALLS HAVE BEEN MADE ON THE VEHICLE WHICH WERE RECORDED AS A "BAD ECU PROGRAM". SERVICE TECHNICIANS "REPROGRAMMED THE ECU" TO "RESET ADAPTIVE MEMORY AND SHIFT POINTS" HOWEVER THERE WAS NO CHANGE IN PERFORMANCE. IT WAS SUGGESTED THAT THIS WAS A DESIGN PROBLEM WHICH HAD BEEN CORRECTED IN LATER MODEL YEARS. THE POTENTIAL CONSEQUENCES OF THE TRANSMISSION'S FAILURE TO IMMEDIATELY ENGAGE IN THE CORRECT GEAR ARE THE LOSS IN ABILITY TO QUICKLY ACCELERATE OUT OF A PENDING COLLISION OR TO AVOID SLOWING IN THE MIDDLE OF AN INTERSECTION AND CAUSING OTHERS TO HAVE COLLISIONS. *TR

2007 SIENNA, HESITATES AFTER RE-ACCELERATING BETWEEN 5 TO 10 MPH. ACCELERATION PRESSED BUT CAR DOES NOT MOVE FOR 1 OR 2 SECOND. TOOK TO DEALER 3 TIME AND ALSO TALKED TO TOYOTA HQ (DEALER DID FIND PROBLEM BUT HQ SAID NOT TO PUT ANYTHING IN REPORT SAYING THERE IS A PROBLEM) THEY JUST SAYING NOTHING CAN BE DONE TO CAR RIGHT NOW A.K.A NO UPDATES AVAILABLE ALSO AUTOMATIC TRANSMISSION HAS LOT OF JERKS WHEN IT SWITCHES GEARS... EXAMPLE: HALF STOP AT STOP SIGN AND IT ACCELERATES WITHOUT DEPRESSING THE PEDAL AND RPM GOING UP BUT CAR NOT MOVING UNTIL HALF WAY DOWN TO INTERSECTION. *TR

TRANSMISSION SLIPPING ON 2007 TOYOTA SIENNA VAN. WHEN TRAVELING AT 6-8 MPH THE TRANSMISSION WILL SLIP WHEN THE ACCELERATOR IS DEPRESSED. THE VAN WILL HESITATE THEN SUDDENLY LURCH FORWARD. THE DEALER SAYS THAT THIS IS NORMAL AND WILL NOT DO ANYTHING TO REPAIR IT. *TR

ENGINE/TRANSMISSION HESITATION/NON-RESPONSIVENESS. THIS IS PARTICULARLY APPARENT WHEN YOU LIFT OFF THE THROTTLE TO GO OVER A BUMP OR TURN. WHEN YOU PRESS THE THROTTLE AFTER THAT, THE THROTTLE DOES NOT RESPOND QUICKLY LIKE ANY OF MY OTHER VEHICLES. THIS HAPPENS ALL THE TIME. *TR