P1604 GMC - Loss Of IPC Serial Data Conditions
- Faulty Instrument Panel Cluster (IPC)
- Instrument Panel Cluster harness is open or shorted
- Instrument Panel Cluster circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1604 Gmc Description
With the engine running engine speed over 500 rpm for 10 continuous seconds, the Powertrain Control Module (PCM) detects an invalid serial data signal or no serial data from the Instrument Panel Cluster (IPC) to PCM for 11 seconds.