P0700 on Toyota: How to Diagnose & Fix
Transmission Control System Malfunction
10 Toyota models · 10 documented issues · 4 critical · $100-$4,500 repair
P0700 on Toyota by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Grinding into 2nd or 3rd gear
- Notchy shift feel
- Difficulty shifting when cold
- Clutch pedal inconsistent
- Metallic grinding sound
How to Fix
Change transmission fluid with Toyota genuine fluid. Bleed clutch hydraulic system if pedal feel is off. Some owners report improved shifting with aftermarket transmission fluid. Synchro replacement in severe cases.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Red Line 50304 MT-90 75W-90 GL-4 manual-transmission gear oil, one quart
replace incorrect, low or contaminated manual-transmission oil after external clutch and shifter checks Fitment/availability: Specification match for 2016-2023 Tacoma manual transmissions requiring API GL-3/GL-4 SAE 75W-90; three one-qua…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipConsider OEM parts for critical components like sensors and electrical parts - aftermarket can be unreliable
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota Tacoma forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
Sources for this issue (1)
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.
Common Symptoms
- Jerking or shuddering when accelerating from a stop
- High RPM before the transmission engages
- Hesitation or slipping during acceleration
- Transmission not shifting into gear
- Complete loss of power while driving
How to Fix
Perform CVT fluid change at recommended intervals (every 60,000 miles). Software update from Toyota dealer for transmission control module. Replace torque converter if diagnosed as failed. Complete CVT transmission replacement in severe cases.
Owner tips & cautions
- WarningThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- TipSearch Toyota Corolla forums and owner groups for real-world experiences and DIY guides
- TipGet multiple quotes from independent mechanics - dealer prices can be 2-3x higher for the same repair
Sources for this issue (4)
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.
Common Symptoms
- Delay between pressing gas and vehicle accelerating
- Engine RPM rises before speed increases
- Hesitation when merging or passing
- Jerky low-speed acceleration
How to Fix
Toyota released ECU/TCU software updates that improve throttle response mapping. Visit dealer for the latest calibration. CVT fluid change with Toyota CVT Fluid TC at 60,000 miles improves responsiveness. Some owners install aftermarket throttle controllers (Sprint Booster or Pedal Commander) to reduce the electronic throttle delay.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
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.
Common Symptoms
- Harsh 1-2 and 2-3 shifts at low speeds
- Jerking during parking lot maneuvers
- Clunking when shifting from Park to Drive
- Shifts improve significantly when transmission is warm
How to Fix
Have dealer perform TCU software update (latest calibration reduces shift harshness). Transmission fluid change with BMW/ZF LifeGuard 8 fluid (83222289720) at 50,000 miles improves shift quality. If mechatronic unit is worn, replacement runs $2,000-3,000. ZF 8HP is generally reliable with proper fluid maintenance.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- BLAU F2A1809-ERL-C GR Supra 8HP51 pan-filter and ATF service kit
perform a complete specified-fluid pan/filter maintenance service using the factory fill-temperature and level procedure after diagnosis Fitment/availability: 2020-2025 GR Supra 3.0L and 2021-2024 GR Supra 2.0L with ZF GA8HP51Z automatic…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
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.
Common Symptoms
- Chirping or squealing when pressing clutch
- Noise disappears when clutch is fully engaged or released
- Sound worsens in cold weather
- Grinding feel through clutch pedal
How to Fix
Replace throw-out bearing (clutch release bearing). This requires transmission removal so it is labor-intensive. Most shops recommend replacing the clutch disc, pressure plate, and pilot bearing at the same time (complete clutch kit). Exedy OEM replacement kit (FJK1005) or South Bend Stage 1 for modified cars.
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.
Common Symptoms
- Unexpected RPM blips during shifts
- Over-revving during downshifts with iMT active
- Vague clutch pedal feel
- Difficult to heel-toe with iMT enabled
- Jerky shifts in city driving
How to Fix
Disable iMT rev-matching via the vehicle settings menu for a more direct shift feel. Many experienced drivers prefer iMT off for better control. For clutch feel, aftermarket clutch delay valve (CDV) delete improves pedal response. Shift linkage bushings from PERRIN or Torque Solution improve shift precision.
P0700 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0700 mean on a Toyota?
P0700 stands for "Transmission Control System Malfunction." P0700 is a general code indicating the transmission control module (TCM) has detected a fault somewhere in the transmission control system and has requested the check engine light be turned on. By itself it doesn't pinpoint the problem — it's an 'umbrella' code that tells you to look for additional, more specific transmission codes stored alongside it. The actual fault could be electrical, a sensor, a solenoid, or an internal transmission issue. You may notice harsh or delayed shifts, slipping, or the transmission going into a protective 'limp' mode. On Toyota it is documented across 10 models: Tacoma, Corolla, C-HR, Supra, GR86, GR Corolla, Corolla Hatchback, Tercel, Highlander, RAV4.
What are the most common causes of P0700?
The most common causes of P0700 are: Stored companion transmission codes pointing to the real fault, Faulty shift solenoid or pressure control solenoid, Low, dirty, or degraded transmission fluid, Faulty transmission speed or input/output sensor, Wiring, connector, or ground problems at the transmission, Failing transmission control module (TCM), Internal transmission mechanical wear or clutch problems, Valve body fault or sticking valves. The specific cause varies by vehicle.
How much does it cost to fix P0700 on a Toyota?
Published repair estimates on Toyota range from $100 to $4,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0700 on a different make?
View P0700 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.