P2681 on Toyota
Engine Coolant Bypass Valve Control Circuit/Open
P2681 on Toyota vehicles indicates engine coolant bypass valve control circuit/open. Au7o has documented this code across 1 Toyota model — most commonly on RAV4. 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.
Common Causes of P2681
- •Open/broken wiring in the bypass valve circuit
- •Faulty coolant bypass valve/actuator
- •Corroded or disconnected connector
- •Blown fuse
- •PCM driver fault
P2681 on Toyota by Model
Toyota RAV4(1 issue)
- 2019-2021 RAV4 Flow Shut-Off Valve Leak or Circuit Fault - CSP 24TE042019-2021
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. These sources do not support the old 2019-2023 scope, 2,000-report count, generic P0128/P2181 mapping, catastrophic-engine claim or fixed repair price.
Looking for P2681 on a different make?
View P2681 across all makes →Frequently Asked Questions
What does P2681 mean on 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 specifically, this code is documented across 1 model.
What causes P2681 on Toyota vehicles?▼
Common causes on Toyota: Open/broken wiring in the bypass valve circuit, Faulty coolant bypass valve/actuator, Corroded or disconnected connector, Blown fuse, PCM driver fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2681 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P2681 documented?▼
Au7o has documented P2681 on 1 Toyota model: RAV4.