Severity: Fix right away. Driving risks expensive damage or a breakdown.
Another module cannot talk to the transmission computer over the data network, so shifting may be affected.
Check fuses and wiring first, then have a shop trace the network fault.
The transmission may go into limp mode. Get it diagnosed with a scan tool.
Avoid driving until it is checked — towing is the safer choice. The transmission may go into limp mode. Get it diagnosed with a scan tool.
The most common causes are: Damaged data wiring; Blown fuse; Failing transmission computer; Corroded connector. A scan tool and a visual check of the parts above is where a technician starts.
Check fuses and wiring first, then have a shop trace the network fault.
