BMW DTC U1171 – Coolant Pump Communication Plausibility
DTC U1171 meaning on BMW
The DTC U1171 on a BMW refers to a fault related to the communication plausibility of the coolant pump. This diagnostic trouble code indicates that there is an issue with the communication between the control module and the coolant pump in the vehicle’s cooling system.
BMW DTC U1171 symptoms
Symptoms of the DTC U1171 on a BMW may include:
- Engine overheating
- Check Engine Light (CEL) illuminated on the dashboard
- Loss of coolant
- Reduced engine performance
BMW DTC U1171 causes
Common causes of the DTC U1171 on a BMW include:
- Defective coolant pump
- Wiring or connection issues between the control module and the coolant pump
- Faulty control module
BMW DTC U1171 seriousness
The DTC U1171 is a serious fault as it directly affects the cooling system of the vehicle. Ignoring this fault can lead to engine overheating, potential damage to engine components, and ultimately engine failure.
How to diagnose DTC U1171 on BMW
To diagnose the DTC U1171 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the coolant pump and its connections for any visible damage
- Check the wiring harness and connectors for any signs of wear or corrosion
- Test the control module for proper communication with the coolant pump
How to fix DTC U1171 on BMW
To fix the DTC U1171 on a BMW, the following steps may be taken:
- Replace the faulty coolant pump if it is determined to be the cause of the issue
- Repair or replace any damaged wiring or connectors in the cooling system
- If the control module is faulty, it may need to be reprogrammed or replaced
How to erase DTC U1171 on BMW
To erase the DTC U1171 on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the vehicle’s system. Once the underlying issue has been addressed and fixed, the fault code can be cleared to reset the Check Engine Light.
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
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