P0117 – BMW DTC

BMW DTC P0117 – Engine Coolant Temperature Sensor 1 Circuit Low

DTC P0117 meaning on BMW

The DTC P0117 code on a BMW indicates that the Engine Coolant Temperature (ECT) sensor 1 circuit is reading a low voltage signal. This sensor is responsible for monitoring the engine coolant temperature and providing this information to the engine control module (ECM).

BMW DTC P0117 symptoms

Some common symptoms associated with the DTC P0117 code on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Inaccurate temperature gauge readings
• Poor fuel economy
• Engine running too rich or too lean

BMW DTC P0117 causes

There are several potential causes for the DTC P0117 code on a BMW, including:

• Faulty Engine Coolant Temperature (ECT) sensor
• Corroded or damaged ECT sensor wiring
• Issues with the ECM or related circuits

BMW DTC P0117 seriousness

While the DTC P0117 code may not cause immediate drivability issues, it is important to address it promptly to prevent potential long-term damage to the engine and ensure optimal performance and fuel efficiency.

How to diagnose DTC P0117 on BMW

To diagnose the DTC P0117 code on a BMW, a mechanic may perform the following steps:

1. Use a scan tool to retrieve the fault codes and freeze frame data
2. Inspect the ECT sensor and its wiring for any visible damage or corrosion
3. Test the ECT sensor’s resistance and voltage readings
4. Check the ECM and related circuits for proper operation

How to fix DTC P0117 on BMW

To fix the DTC P0117 code on a BMW, the following steps may be taken:

1. Replace the faulty Engine Coolant Temperature (ECT) sensor
2. Repair or replace any damaged or corroded wiring associated with the ECT sensor
3. Clear the fault codes and reset the ECM

How to erase DTC P0117 on BMW

To erase the DTC P0117 code on a BMW, you can use an OBD-II scan tool to clear the fault codes stored in the ECM. Once the codes are cleared, the Check Engine Light should turn off. It is important to ensure that the underlying issue causing the fault code has been properly addressed before clearing the code.

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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