P1512critical severityPowertrain
Boost Pressure High
on 2008 Toyota Highlander 3.5L V6 · AWD
What this code means
Turbo boost pressure exceeds maximum limit, indicating overboosting.
Symptoms
- CEL
- Engine knock
- Excessive power
- Potential engine damage
- Reduced power mode
Common causes
- Stuck-closed wastegate
- Faulty boost solenoid
- Disconnected vacuum line
- Faulty boost sensor
Diagnostic steps
- Check wastegate operation
- Test boost solenoid
- Inspect vacuum lines
- Monitor boost with gauge
Repair notes
Repair wastegate or boost control system.
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