P26B4 on MINI
Charge Air Cooler Coolant Pump Performance
P26B4 on MINI vehicles indicates charge air cooler coolant pump performance. Au7o has documented this code across 1 MINI model — most commonly on GP. 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 MINI range from $500 to $1,200, 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 MINI by Model
MINI GP(1 issue)
- Electric Water Pump Failure2013-2023
The electric water pump on the N18 and B48 engines is a known failure point across the BMW/MINI platform. The pump motor or impeller fails, causing loss of coolant circulation and rapid overheating. Unlike mechanical water pumps that give gradual warning signs, the electric pump can fail suddenly with no prior symptoms. The GP engines run hotter than standard MINI models, putting additional stress on the pump. Failure typically occurs between 50,000-100,000 miles.
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View P26B4 across all makes →Frequently Asked Questions
What does P26B4 mean on MINI?▼
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 MINI specifically, this code is documented across 1 model.
What causes P26B4 on MINI vehicles?▼
Common causes on MINI: 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 MINI?▼
Repair costs on MINI range from $500 to $1,200, depending on the specific model and root cause.
Which MINI models have P26B4 documented?▼
Au7o has documented P26B4 on 1 MINI model: GP.