P2681 on Toyota: How to Diagnose & Fix
Engine Coolant Bypass Valve Control Circuit/Open
1 Toyota model · 1 documented issue
P2681 on Toyota by model: symptoms, diagnosis and fix
Toyota Customer Support Program 24TE04 covers certain 2019-2021 RAV4 and RAV4 Hybrid vehicles and certain 2021 RAV4 Prime vehicles when a small engine-coolant leak from the flow shut-off valve is verified. Coolant may drip onto other components and can produce an Engine Maintenance Required message or abnormal air-conditioning operation. Toyota T-SB-0112-24 Rev1 separately applies when that message is accompanied by DTC P268111 and/or P268115.
Common Symptoms
- Engine Maintenance Required message
- DTC P268111 and/or P268115
- Small engine-coolant leak at the flow shut-off valve
- Abnormal air-conditioning operation associated with the documented condition
How to Fix
Check coolant level only when the engine is cool, record the exact message and diagnostic codes, and have an authorized Toyota dealer verify VIN eligibility and the CSP or bulletin condition. The CSP primary coverage ended November 30, 2025; secondary coverage is 10 years from first use or 100,000 miles, whichever occurs first. If eligible and verified, Toyota states the covered water valve or water-bypass hose assembly repair is performed at no charge. T-SB-0112-24 Rev1 identifies updated hose assemblies 16260-F0300 for gasoline RAV4 and 16260-F0310 for RAV4 Hybrid/Prime, plus Toyota Super Long Life Coolant, but parts should not be ordered until the diagnosis and VIN eligibility are confirmed. Otherwise continue cooling-system diagnosis; an initial diagnostic fee may apply when the condition is not covered.
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.
- Toyota 16260-F0310 water-bypass hose assembly
out-of-coverage replacement for a verified hybrid/Prime flow-shutoff-valve hose-assembly condition Fitment/availability: T-SB-0112-24 updated branch for covered RAV4 Hybrid and 2021 RAV4 Prime A25A-FXS applications; verify VIN, P268111/P…
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Owner tips & cautions
- WarningDo not open the cooling system while hot. Record coolant level, the exact warning text and all diagnostic codes before topping off or clearing codes.
- TipAsk the dealer to document VIN eligibility, first-use date, mileage and whether the condition qualifies under CSP 24TE04 or T-SB-0112-24 Rev1.
Sources for this issue (2)
P2681 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 P2681 mean on a Toyota?
P2681 stands for "Engine Coolant Bypass Valve Control Circuit/Open." The engine coolant bypass valve routes coolant flow (e.g., to control warm-up or flow paths). The PCM commands it and detects an open in its control circuit, so the valve cannot be operated. On Toyota it is documented across 1 model: RAV4.
What are the most common causes of P2681?
The most common causes of P2681 are: Open/broken wiring in the bypass valve circuit, Faulty coolant bypass valve/actuator, Corroded or disconnected connector, Blown fuse, PCM driver fault. The specific cause varies by vehicle.
How much does it cost to fix P2681 on a Toyota?
Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.