P0721moderate severityPowertrain
Output Speed Sensor Circuit Range/Performance
on 1997 Chevrolet Astro 4.3L V6 Vortec · RWD
What this code means
Output speed sensor signal out of range.
Symptoms
- Erratic speedometer
- Shift problems
Common causes
- Sensor fault
- Tone ring issue
Diagnostic steps
- Compare to wheel speed signals
- Test sensor
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