P26B4 on Toyota
Charge Air Cooler Coolant Pump Performance
P26B4 on Toyota vehicles indicates charge air cooler coolant pump performance. Au7o has documented this code across 1 Toyota model — most commonly on Sequoia. P26B4 is a powertrain code relating to the charge air cooler (intercooler) coolant pump performance on a liquid-cooled intercooler system, where an electric pump circulates coolant to cool the pressurized intake air from the turbocharger. The computer commands the pump and monitors flow, speed, or current, and sets this code when the pump's performance is outside the expected range. This can lead to higher intake air temperatures, reduced boost or power, and possible knock protection. It points to the charge-air-cooler coolant pump or its loop rather than the main engine cooling system. Typical repair costs on Toyota range from $100 to $2,000, depending on the specific model and root cause.
Common Causes of P26B4
- •Failed or weak charge air cooler coolant pump
- •Low coolant or air pocket in the intercooler loop
- •Coolant leak in the charge air cooler circuit
- •Clogged or restricted intercooler coolant passages
- •Wiring, connector, fuse, or relay fault at the pump
- •Faulty coolant temperature or flow sensor in the loop
- •PWM control or driver fault in the controlling module
P26B4 on Toyota by Model
Toyota Sequoia(1 issue)
- i-FORCE MAX Hybrid Cooling System Issues2023-2025
The 2023+ Sequoia with the i-FORCE MAX twin-turbo V6 hybrid powertrain has experienced cooling system issues related to the added complexity of cooling both the twin-turbo engine and hybrid battery system. Owners report coolant loss with no visible external leak (internal leak at turbo coolant lines), electric cooling fan running continuously at high speed even in mild weather, and occasional overheating warnings during towing. The hybrid battery cooling circuit is separate from the engine cooling circuit and has its own failure modes.
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View P26B4 across all makes →Frequently Asked Questions
What does P26B4 mean on Toyota?▼
P26B4 stands for "Charge Air Cooler Coolant Pump Performance." P26B4 is a powertrain code relating to the charge air cooler (intercooler) coolant pump performance on a liquid-cooled intercooler system, where an electric pump circulates coolant to cool the pressurized intake air from the turbocharger. The computer commands the pump and monitors flow, speed, or current, and sets this code when the pump's performance is outside the expected range. This can lead to higher intake air temperatures, reduced boost or power, and possible knock protection. It points to the charge-air-cooler coolant pump or its loop rather than the main engine cooling system. On Toyota specifically, this code is documented across 1 model.
What causes P26B4 on Toyota vehicles?▼
Common causes on Toyota: Failed or weak charge air cooler coolant pump, Low coolant or air pocket in the intercooler loop, Coolant leak in the charge air cooler circuit, Clogged or restricted intercooler coolant passages, Wiring, connector, fuse, or relay fault at the pump. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P26B4 on a Toyota?▼
Repair costs on Toyota range from $100 to $2,000, depending on the specific model and root cause.
Which Toyota models have P26B4 documented?▼
Au7o has documented P26B4 on 1 Toyota model: Sequoia.