P0731high severityPowertrain
Gear 1 Incorrect Ratio
on 2004 GMC Yukon 5.3L V8 Vortec · RWD
What this code means
Incorrect gear ratio detected in 1st gear.
Symptoms
- Slipping in 1st gear
- Harsh 1-2 shift
- No 1st gear
Common causes
- 1st gear clutch pack worn
- Shift solenoid issue
- Valve body problem
- Low line pressure
Diagnostic steps
- Check fluid
- Test shift solenoids
- Monitor gear ratio in 1st
- Check line pressure
Repair notes
Internal transmission service may be needed.
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