Symptoms of P0235 OBD II Trouble Code
- The code P0235 will be set which simply means that a problem exists somewhere within this circuit preventing proper boost control. Additional codes in progression may be set regarding this malfunction, each of which pertains to a section of the circuit.
- The engine may lack acceleration.
- The boost pressure gauge will indicate less than 9 pounds of boost or over 14 pounds of boost. Both are out of range.
- Unusual whining noises or rattling from the turbocharger or piping.
- Engine knock sensor code may appear indicating detonation is occurring due to high cylinder head temperatures.
- Engine may exhibit an overall lack of power.
- Smoke from the exhaust.
- Fouled spark plugs
- Engine temperature unusually high at cruise speeds.
- Hissing noises at the wastegate
Common Causes of P0235 OBD II Trouble Code
- Vacuum leak at the intake manifold
- Dirty air cleaner
- Defective wastegate- either stuck open, closed or leaking
- Insufficient oil supply to main shaft bearing-obstruction in the oil feed or return line.
- Bearing failure causing low spin-up due to drag.
- Wobble in the bearing causing the turbine blades to strike the turbo housing.
- Nicked, bent or missing turbine blades causing an out-of-balance situation.
- Oil seal leak on the compressor side of the turbo as seen by oil in the turbo and fouled plugs.
- Excessive end play in the turbo shaft
- Defective innercooler
- Loose connections at intake pipe to throttle body
- Cracks in the turbo housing
- Loose exhaust manifold to turbo bolts.
- Poor electrical connection at Turbo boost sensor.
- Short or open in the sensor harness between the sensor and ECM.
- Defective sensor or ECM 5 volt reference driver.