BMW DTC P0864 – TCM Communication Circuit Range/Performance
DTC P0864 meaning on BMW
The Diagnostic Trouble Code (DTC) P0864 for BMW refers to a fault in the Transmission Control Module (TCM) Communication Circuit. This code indicates that there is a range/performance issue in the communication between the TCM and other control modules within the vehicle.
BMW DTC P0864 symptoms
Symptoms of DTC P0864 on a BMW may include:
- Transmission shifting issues
- Harsh or delayed shifting
- Transmission stuck in a single gear
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P0864 causes
Common causes of DTC P0864 on a BMW include:
- Faulty TCM
- Wiring or connection issues in the TCM communication circuit
- Defective transmission sensors
- Software glitches in the TCM
BMW DTC P0864 seriousness
DTC P0864 should be addressed promptly as it can lead to drivability issues and potential damage to the transmission system. Ignoring this fault may result in further complications and costly repairs.
How to diagnose DTC P0864 on BMW
To diagnose DTC P0864 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 TCM communication circuit for any visible damage or loose connections
- Check the transmission sensors for proper operation
- Perform a TCM software update if necessary
How to fix DTC P0864 on BMW
To fix DTC P0864 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connections in the TCM communication circuit
- Replace the TCM if it is found to be faulty
- Address any issues with the transmission sensors
- Update the TCM software to the latest version
How to erase DTC P0864 on BMW
After the underlying issue causing DTC P0864 on a BMW has been resolved, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s computer memory and turn off the Check Engine Light.
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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