P0600 Cadillac A/T Control Serial Communication Link Malfunction

Possible causes

– The circuit between ECM and A/T control unit is open or shorted
– Faulty Engine control Module (ECM)
– Engine control Module(ECM) harness is open or shorted
– Engine control Module (ECM) cicuit poor electricl connection
– Faulty Automatic Transmission Module (TCM)
– Low battery voltage
– Automatic Transmission Module (TCM) harness is open or shorted
– Automatic Transmission Module (TCM) cicuit poor electricl connection

Tech description

For Infiniti vehicles, the problem is usually related to the automatic transmission (A/T) control unit. Either a bad connector o bad control unit itself.

What about the obd code?

ECM receives incorrect voltage from A/T control unit continuously

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Improper shifting timing

P0600 Cadillac Description

These circuit lines are used to control the smooth shifting up and down of A/T during the and acceleration/deceleration. Voltage signal are exchanged between the Engine Control Module (ECM) and Automatic Transmission (A/T) control unit.