BMW DTC P16E4 – PCM/ECM/TCM Internal Switch-On Temperature Sensor Circuit Low
DTC P16E4 meaning on BMW
DTC P16E4 on a BMW refers to a fault with the PCM/ECM/TCM internal switch-on temperature sensor circuit registering a low voltage. This diagnostic trouble code indicates an issue with the temperature sensor circuit, which can affect the proper functioning of the powertrain control module (PCM), engine control module (ECM), or transmission control module (TCM).
BMW DTC P16E4 symptoms
Symptoms of DTC P16E4 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Engine running rough or misfiring
- Reduced engine performance
- Transmission shifting issues
BMW DTC P16E4 causes
Common causes of DTC P16E4 on a BMW include:
- Faulty temperature sensor
- Wiring or connector issues in the temperature sensor circuit
- PCM/ECM/TCM internal fault
BMW DTC P16E4 seriousness
While DTC P16E4 may not always result in immediate drivability issues, it is important to address this fault promptly to prevent potential damage to the engine or transmission systems. Ignoring this fault could lead to further complications and increased repair costs.
How to diagnose DTC P16E4 on BMW
To diagnose DTC P16E4 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
- Inspect the temperature sensor and its wiring for any visible damage or corrosion
- Test the temperature sensor’s resistance and voltage output
- Check the PCM/ECM/TCM for any internal faults
How to fix DTC P16E4 on BMW
To fix DTC P16E4 on a BMW, the following steps may be taken:
- Replace the faulty temperature sensor if it is determined to be the cause of the issue
- Repair any damaged wiring or connectors in the temperature sensor circuit
- If the fault lies with the PCM/ECM/TCM, it may need to be reprogrammed or replaced
How to erase DTC P16E4 on BMW
After the necessary repairs have been made to address DTC P16E4 on a BMW, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s computer to monitor the system for any new faults.
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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