P0177low severityPowertrain
Fuel Composition Sensor Circuit Range/Performance
on 2012 Chevrolet Express 4.3L V6 Vortec · RWD
What this code means
The fuel composition sensor reading is outside expected range.
Symptoms
- Check Engine Light
- Incorrect fueling
Common causes
- Contaminated sensor
- Sensor calibration issue
- Mixed fuel types
Diagnostic steps
- Compare sensor reading to known fuel type
- Test sensor output range
Repair notes
Replace sensor.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1