BMW DTC P0940 – Hydraulic Oil Temperature Sensor Circuit High
DTC P0940 meaning on BMW
DTC P0940 on a BMW indicates a fault with the hydraulic oil temperature sensor circuit. This code is triggered when the powertrain control module (PCM) detects a high voltage signal from the hydraulic oil temperature sensor, indicating a potential issue with the sensor or its circuit.
BMW DTC P0940 symptoms
Symptoms of DTC P0940 on a BMW may include:
- Check Engine Light illuminated
- Inaccurate temperature readings on the dashboard
- Transmission shifting issues
BMW DTC P0940 causes
Common causes of DTC P0940 on a BMW include:
- Faulty hydraulic oil temperature sensor
- Short circuit or open circuit in the sensor wiring
- Corrosion or poor connections in the sensor circuit
BMW DTC P0940 seriousness
While DTC P0940 may not always cause immediate drivability issues, it is important to address this fault promptly to prevent potential damage to the transmission system. Ignoring this code could lead to further complications and costly repairs down the line.
How to diagnose DTC P0940 on BMW
To diagnose DTC P0940 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the hydraulic oil temperature sensor and its wiring for any visible damage
- Test the sensor’s resistance and voltage output using a multimeter
- Check for any loose connections or corrosion in the sensor circuit
How to fix DTC P0940 on BMW
To fix DTC P0940 on a BMW, you can try the following solutions:
- Replace the faulty hydraulic oil temperature sensor
- Repair any damaged wiring or connectors in the sensor circuit
- Clean any corrosion from the sensor connections
- Clear the fault code and test drive the vehicle to ensure the issue is resolved
How to erase DTC P0940 on BMW
To erase DTC P0940 on a BMW, you can use a diagnostic scanner to clear the fault code from the PCM’s memory. After clearing the code, it is recommended to perform a test drive to verify that the issue has been successfully resolved.
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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