Symptoms:

• Insufficient turbocharger pressure
• Reduced engine performance
• Check engine light will come on

Causes:

• Damaged, corroded, loose or shorted electrical components, such as wiring or connectors
• Open or shorted exhaust back pressure valve
• Poor connection in the exhaust back pressure valve circuit
• Faulty PCM in some rare cases

Possible Solutions:

• Verify the code with an OBD-II Scanner or an exhaust back pressure step test
• Perform a visual inspection of the electrical components in the exhaust back system and repair any that are loose, corroded, faulty, open or shorted
• After each repair, perform a road test to ensure that the repair addressed the proper cause
• Replace or repair a faulty exhaust back pressure valve