P0700 on a Toyota: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can usually drive a Toyota short-term with P0700, but stop if the transmission starts slipping or shifting harshly.

What P0700 means on a Toyota

On a Toyota, P0700 means the transmission control module has set a fault and asked the engine computer to turn on the check engine light. The actual problem is stored as a separate code inside the TCM, and a basic OBD2 reader usually cannot see it. On many Toyotas the TCM is built into the transmission, so the code points to the transmission system rather than the engine.

Is P0700 common on Toyotas?

P0700 shows up on higher-mileage Toyotas with automatic transmissions, especially Camrys, Corollas, and RAV4s. Common triggers include failing shift solenoids, speed sensors, and low transmission fluid. Toyota transmissions are generally durable, so a full diagnosis of the stored code usually finds a fixable part rather than a whole new transmission.

Commonly reported on: Camry, Corolla, RAV4, Highlander.

Symptoms

Check engine light on
Harsh or delayed shifts
Transmission warning light or limp mode
Sometimes no drivability change at all

Common causes

most common: Faulty shift solenoid
common: Low or dirty transmission fluid
common: Failing transmission speed sensor
less common: Faulty range (gear position) switch
less common: Internal TCM or wiring fault

How to fix it

Fix	DIY?	Typical cost
Read the stored transmission code with a professional scan tool	Mechanic	$80–150
Replace the transmission fluid and filter	Yes	$100–250
Replace the faulty shift solenoid	Mechanic	$200–600
Replace the speed sensor or range switch	Mechanic	$150–450

Frequently asked questions

Can I drive my Toyota with a P0700 code?

Yes, usually for a short time if the transmission shifts normally. If it starts slipping or shuddering, stop driving and have it towed.

Why does P0700 show up but no other codes appear on my scanner?

P0700 is a flag from the transmission computer. The real code is stored in the TCM, and only a professional scan tool can read it, so the check engine light can come on with no other visible codes.

How much does it cost to fix P0700 on a Toyota?

Diagnosis runs about $80 to $150, and the repair depends on the stored code. Fluid and filter service costs $100 to $250, while a solenoid or sensor replacement runs $150 to $600.