BMW DTC P1D40 – A/C Compressor Motor Input Current Sensor Current Out of Range High
DTC P1D40 meaning on BMW
- DTC: Diagnostic Trouble Code
- P1D40: A/C Compressor Motor Input Current Sensor Current Out of Range High
- On BMW vehicles, this code indicates that the input current sensor for the A/C compressor motor is detecting a current that is higher than the expected range.
BMW DTC P1D40 symptoms
- Malfunction indicator light (MIL) or check engine light may illuminate
- Reduced or no cooling from the air conditioning system
- Unusual noises coming from the A/C compressor
BMW DTC P1D40 causes
- Faulty A/C compressor motor
- Short circuit or open circuit in the wiring related to the A/C compressor motor input current sensor
- Issues with the input current sensor itself
BMW DTC P1D40 seriousness
- If left unresolved, this issue can lead to further damage to the A/C compressor system and may result in the A/C system not functioning properly.
- It is recommended to address this problem promptly to avoid potential costly repairs.
How to diagnose DTC P1D40 on BMW
- Use a diagnostic scanner to retrieve the fault codes and perform a comprehensive scan of the A/C system
- Inspect the wiring and connections related to the A/C compressor motor input current sensor
- Test the A/C compressor motor and the input current sensor for proper functionality
How to fix DTC P1D40 on BMW
- Replace the faulty A/C compressor motor if necessary
- Repair any wiring issues or replace damaged wiring related to the input current sensor
- Replace the input current sensor if it is found to be faulty
How to erase DTC P1D40 on BMW
- After completing the necessary repairs, use a diagnostic scanner to clear the fault codes from the vehicle’s memory
- Ensure that the repairs have resolved the issue before clearing the fault codes
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.