B0521 CHEVROLET – Tachometer Signal Circuit Malfunction

 

B0521 CHEVROLET Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B0521 CHEVROLET Possible Causes

 

Faulty Instrument Panel Cluster (IPC),Instrument Panel Cluster (IPC) harness is open or shorted,Instrument Panel Cluster (IPC) circuit poor electrical connection

 

B0521 CHEVROLET Description

 

The Instrument Panel Cluster (IPC) receives engine RPM information from the Powertrain Control Module (PCM) on a dedicated engine speed input to IPC. IPC also receives engine RPM data on the serial data line. IPC monitors engine RPM output information sent from PCM for an out of range condition. The PCM sets the Diagnostic Trouble Code (DTC) when the IPC detects that the engine RPM is at least 7400 RPM.