P0730high severityPowertrain
Incorrect Gear Ratio
on 2002 Chevrolet Express 6.0L V8 Vortec · RWD
What this code means
The PCM detected that the actual gear ratio does not match the expected ratio for the commanded gear.
Symptoms
- Check Engine Light
- Transmission slipping
- Harsh shifting
- Flare on shifts
- Limp mode
Common causes
- Worn clutch packs
- Low fluid level
- Faulty shift solenoid
- Internal transmission failure
- Torque converter issue
Diagnostic steps
- Check fluid level and condition
- Monitor gear ratio data with scan tool
- Check for other transmission codes
- Test shift solenoids
- May need internal transmission inspection
Repair notes
Often indicates internal transmission wear. Start with fluid check and solenoid testing.
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