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P2681 on TOYOTA COROLLA

Engine Coolant Bypass Valve A Control Circuit/Open

NHTSA Reports
5
Severity
Medium
Most Affected
2020, 2021
Crashes / Fires
0 / 0
Source: NHTSA Complaints Database · SAE J2012

What P2681 Means on Your TOYOTA COROLLA

P2681 is a diagnostic trouble code indicating: Engine Coolant Bypass Valve A Control Circuit/Open. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

5 TOYOTA COROLLA owners have reported this issue to NHTSA across model years 2020-2021. Most reports come from the 2020, 2021 model years. The most commonly reported component is Engine (60.0% of reports).

Real TOYOTA COROLLA Owner Reports

Source: NHTSA Complaints Database

"Coolant bypass valve. Code is P2681, part will fail and vehicle will consistently display a Engine Maintenance Required Visit Your Dealer on the MID. Dealerships will try and charge 500+ to repair it when the part is under 100+. Problem started to appear since end of March."

— 2020 TOYOTA COROLLA owner · UNKNOWN OR OTHER · Filed 03/30/2025

"I keep getting a warning sign on my dashboard stating that "Engine maintenance required. Call your dealership". After scanning for codes, I get the code P2681, or that the Engine coolant bypass valve is faulty. After looking online it appears that this is a common issue with this car model."

— 2020 TOYOTA COROLLA owner · ENGINE · Filed 06/01/2024

"Around 40k miles I received an Engine Maintenance Required warning. After some research Engine Maintenance and Engine Service Required are two very different indicators."

— 2020 TOYOTA COROLLA owner · ELECTRICAL SYSTEM,UNKNOWN OR OTHER,ENGINE · Filed 09/06/2023

"Engine code P2681(15) which after lookup is the coolant bypass valve which is a common faulty part that Toyota seems to not care about and charge upwards of 700$ at the dealer to fix."

— 2021 TOYOTA COROLLA owner · ENGINE · Filed 07/31/2024

"Engine coolant bypass valve short to battery. Throwing code - P2681-15 at 33,000 miles."

— 2021 TOYOTA COROLLA owner · ENGINE · Filed 05/21/2024

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

3
'20
2
'21

Common Causes on TOYOTA COROLLA

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 60%
UNKNOWN or OTHER 20%
ELECTRICAL SYSTEM,UNKNOWN or OTHER,ENGINE 20%

What To Do Next

  1. 1
    Check for recalls on YOUR VIN

    Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.

  2. 2
    Get a proper diagnosis

    A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.

  3. 3
    Compare repair quotes

    Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P2681 mean on a TOYOTA COROLLA? ▾
P2681 indicates: Engine Coolant Bypass Valve A Control Circuit/Open. This is a powertrain code. 5 TOYOTA COROLLA owners have reported this to NHTSA.
What are the most common causes of P2681 on TOYOTA COROLLA? ▾
Based on 5 NHTSA reports, the most commonly cited components are: Engine, Unknown Or Other, Electrical System,Unknown Or Other,Engine. These percentages are based on the component field in owner complaints.
Is P2681 serious on my TOYOTA COROLLA? ▾
Of 5 NHTSA reports for this code on TOYOTA COROLLA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.
What should I do if my TOYOTA COROLLA shows P2681? ▾
1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

P2681 on Other Vehicles

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