B0402low severityBody
Tachometer Circuit Malfunction
on 2017 Chevrolet Impala 2.5L I4 Ecotec · AWD
What this code means
The tachometer gauge is not functioning or displays incorrect RPM readings.
Symptoms
- Tachometer reads zero
- Tachometer needle erratic
- Tachometer bouncing at idle
- Gauge needle stuck
Common causes
- Instrument cluster stepper motor failure
- Cluster circuit board fault
- RPM signal issue from PCM
- Wiring problem
Diagnostic steps
- Check RPM signal from PCM with scan tool
- Test tachometer stepper motor
- Inspect cluster circuit board
- Check wiring from PCM to cluster
Repair notes
Replace instrument cluster stepper motor or circuit board.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0005
Driver Knee Airbag Deployment Circuit