P1605 Buick Automatic Transmission Communication
Possible causes
– Weak battery
– Faulty Transmission Control Module (TCM)
– Harness is open or shorted between (TCM) and Engine Control Module (ECM)
– Poor circuit electrical connection between (TCM) and (ECM)
– Faulty Transmission Control Module (TCM)
– Harness is open or shorted between (TCM) and Engine Control Module (ECM)
– Poor circuit electrical connection between (TCM) and (ECM)
What about the obd code?
Malfunction is detected when an incorrect signal from Transmission control module (TCM) is sent to Engine Control Module (ECM).
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1605 Buick Description
The malfunction information related to Automatic Transmission is transferred through the line circuit from Transmission control module (TCM) to Engine Control Module (ECM).
Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera