P26B4: Charge Air Cooler Coolant Pump Performance
3 vehicles · 3 makes · $100-$2,000 repair
Most Reported On
P26B4 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2013-2023 MINI GP, 2012-2019 Volkswagen Beetle, and 2023-2025 Toyota Sequoia, with repair costs ranging from $100 to $2,000.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P26B4, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P26B4 mean?
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.
What are the most common causes of P26B4?
The most common causes of P26B4 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P26B4?
Repair costs for P26B4 range from $100 to $2,000, depending on the vehicle and root cause.
Which vehicles are affected by P26B4?
Au7o has documented P26B4 across 3 vehicle models from 3 manufacturers: MINI, Toyota, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.