Lost Communication With ECM/PCM
Table of contents
U1842 CADILLAC Possible Causes
- Faulty Engine Control Module (ECM)/Powertrain Control Module (PCM)
- Engine Control Module /Powertrain Control Module harness is open or shorted
- Engine Control Module /Powertrain Control Module circuit poor electrical connection
How do I fix code U1842 CADILLAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the U1842 CADILLAC code
The cost of diagnosing the U1842 CADILLAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
U1842 CADILLAC Description
The system voltage is between 9-16 volts. The vehicle power mode master indicates that the need for serial data communications. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.