BMW DTC P0790 – Normal/Performance Switch Circuit
DTC P0790 meaning on BMW
The Diagnostic Trouble Code (DTC) P0790 for BMW refers to the Normal/Performance Switch Circuit. This code indicates an issue with the circuit that controls the normal and performance modes in the vehicle’s transmission system.
BMW DTC P0790 symptoms
Symptoms of DTC P0790 on a BMW may include:
- Transmission shifting problems
- Harsh or delayed shifting
- Transmission stuck in one gear
- Decreased fuel efficiency
- Illuminated Check Engine Light
BMW DTC P0790 causes
Common causes of DTC P0790 on a BMW include:
- Faulty normal/performance switch
- Wiring or connector issues in the switch circuit
- Defective transmission control module (TCM)
- Low transmission fluid level or contaminated fluid
BMW DTC P0790 seriousness
The seriousness of DTC P0790 on a BMW depends on the underlying cause. Ignoring this code can lead to further transmission damage and potentially unsafe driving conditions. It is recommended to address this issue promptly to prevent more severe problems.
How to diagnose DTC P0790 on BMW
To diagnose DTC P0790 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer.
- Inspect the normal/performance switch and its wiring for any visible damage or corrosion.
- Check the transmission fluid level and condition.
- Perform a thorough inspection of the TCM and related components.
How to fix DTC P0790 on BMW
To fix DTC P0790 on a BMW, you can try the following solutions:
- Replace the faulty normal/performance switch if necessary.
- Repair or replace any damaged wiring or connectors in the switch circuit.
- Ensure the transmission fluid is at the correct level and in good condition.
- If the TCM is faulty, consider replacing it with a new unit.
How to erase DTC P0790 on BMW
To erase DTC P0790 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After addressing the underlying issue and making the necessary repairs, you can reset the codes to see if the problem has been 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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