P1644 Buick Traction Control Delivered Torque Output Circuit
Possible causes
– Poor connection at the AC motor control module
– Open or short circuit condition
– Failed AC Motor Control Module
– Open or short circuit condition
– Failed AC Motor Control Module
What about the obd code?
No duty signals are input from the MCM for at least 5 seconds.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1644 Buick Description
The Motor Control Module (MCM) signals various information about the IMA system to the Engine Control Module (ECM) via the MOTFSA signal line. If no duty signals are input from the MCM for at least a set time period, the ECM detects a malfunction and stores a DTC.
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