BMW DTC P26AC – Engine Coolant Bypass Valve ‘B’ Control Circuit/Open
DTC P26AC meaning on BMW
The Diagnostic Trouble Code (DTC) P26AC for BMW refers to an issue with the Engine Coolant Bypass Valve ‘B’ Control Circuit being open. This means that there is a malfunction in the control circuit of the bypass valve, which can impact the proper operation of the engine coolant system.
BMW DTC P26AC symptoms
Symptoms of the BMW DTC P26AC may include:
- Engine overheating
- Decreased engine performance
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P26AC causes
Common causes of the BMW DTC P26AC include:
- Faulty Engine Coolant Bypass Valve ‘B’
- Open or short circuit in the control wiring
- Corrosion or poor connections in the circuit
BMW DTC P26AC seriousness
The BMW DTC P26AC is a serious issue that should be addressed promptly. Ignoring this fault can lead to engine overheating, potential damage to engine components, and reduced vehicle performance.
How to diagnose DTC P26AC on BMW
To diagnose the DTC P26AC on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the Engine Coolant Bypass Valve ‘B’ and its wiring for any visible damage
- Check the resistance of the bypass valve and the control circuit using a multimeter
- Perform a visual inspection of the connectors and wiring for signs of corrosion or poor connections
How to fix DTC P26AC on BMW
To fix the DTC P26AC on a BMW, you can try the following solutions:
- Replace the faulty Engine Coolant Bypass Valve ‘B’
- Repair any open or short circuits in the control wiring
- Clean or replace any corroded connectors in the circuit
- Clear the fault codes using a diagnostic scanner after the repairs
How to erase DTC P26AC on BMW
To erase the DTC P26AC on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s ECU. After making the necessary repairs to address the underlying issue causing the fault code, clearing the DTC will reset the Check Engine Light and ensure that the system is functioning properly.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.