P0700 on Toyota

On higher-mileage 4Runner automatics owners report harsh/abrupt shifts, jerky 3-2 downshifts, unstable RPM blips while coasting near 40 mph, and delayed engagement. The most common mechanical cause is valve-body pressure control wear - a sticking pressure-regulator or throttle valve, or a worn shift solenoid - which raises line pressure and slams the shifts, separate from the torque-converter shudder issue. RepairPal logs hundreds of reports of these trucks not shifting correctly at high mileage. Long-neglected, dark/burnt ATF accelerates it.

The C-HR's CVT (K120) exhibits noticeable hesitation on acceleration and the typical CVT 'rubber band' effect where engine RPM rises before the vehicle accelerates. The lag between throttle input and forward motion is more pronounced than in competing vehicles.

The Continuously Variable Transmission (CVT) in 2014-2019 Corollas may experience shuddering, jerking during acceleration, high RPM before shifting, and in severe cases complete transmission failure. Issues are particularly reported when accelerating from a stop or during downshifting. Some owners have experienced catastrophic failures at relatively low mileage.

Toyota recalled certain 2019 Corolla Hatchback models with CVT transmissions due to pump impeller blades within the torque converter potentially detaching under high-load driving conditions. If blades detach, the torque converter loses hydraulic pressure, causing the vehicle to stall and lose power while driving. This is a safety recall (NHTSA Campaign 19V-252).

The intelligent Manual Transmission (iMT) rev-match system can interfere with smooth shifting, causing unexpected RPM blips and a disconnected shift feel. The system sometimes over-revs or under-revs during downshifts, and the clutch pedal feel is reported as vague.

GR86 models with the 6-speed manual develop throw-out bearing noise, typically a chirping or squealing sound when the clutch pedal is depressed or released. The bearing wears prematurely, especially in stop-and-go traffic. Not an immediate failure risk but worsens over time.

Automatic-transmission Highlanders route ATF through a cooler integrated into the main radiator end tank. When the internal separator corrodes/cracks, engine coolant and transmission fluid mix, producing a pink 'strawberry milkshake' emulsion. Coolant in the ATF destroys the clutch friction material (it absorbs water and disintegrates), so a radiator failure frequently takes the transmission down with it. Especially common on higher-mileage vehicles and those used for towing.

The UA80E/UA80F 8-speed automatic in V6 Highlanders can develop a whine or grind noise traced to defective front carrier assembly pinion shafts/bearings. As the bearings delaminate they shed metal debris through the fluid, which can progressively damage the torque converter and transaxle internals. This is a hard mechanical failure distinct from the more common torque-converter shudder/hesitation driveability complaint, and Toyota's prescribed repair is full transaxle replacement.

Toyota T-SB-0107-19 Rev1 documents a narrow hesitation condition on some 2019 RAV4s: vehicle speed is 6 mph or below, the event occurs immediately after a 3-to-1 downshift, and accelerator input is below 40 percent. Toyota modified ECM logic to reduce that behavior. This is not evidence of a 2019-2023 CVT magnetic-clutch defect, and the bulletin does not use the prior P0700/P0730/P0740/P0868/P17F0/P17F1 list as eligibility criteria. Hesitation outside all three conditions requires normal engine, fuel, brake and transmission diagnosis.

The ZF 8HP51 automatic transmission exhibits rough or jerky shifts at low speeds, particularly 1st-to-2nd and 2nd-to-3rd gear changes during city driving. The mechatronic unit's valve body can develop wear causing harsh engagement. Cold weather worsens symptoms.

The 6-speed manual transmission can exhibit grinding when shifting, particularly into 2nd or 3rd gear, and generally notchy shift feel. This is often related to the synchros or the clutch system hydraulics.

The A132L 3-speed automatic transmission in the Tercel is prone to premature failure, typically presenting as harsh shifting, slipping, or complete loss of forward gears. The transmission was designed for economy driving and struggles with sustained highway use or towing. Internal clutch pack wear and valve body issues are the most common failure modes. Many owners convert to manual transmission or source used replacements rather than rebuild.