Symptoms:

• Poor engine performance
• Insufficient turbocharger pressure
• The exhaust back pressure regulator may be automatically disabled if the PCM stores this code
• The check engine light will be on

Causes:

• Damaged or burnt out electrical wiring
• Damaged connectors
• Open circuits between the exhaust pressure sensor and the PCM
• Turbocharger over-boost
• In rare cases, a faulty PCM

Possible Solutions:

• Perform a visual inspection of all wiring and connectors, and repair any that appear damaged
• Clear the code from the PCM, and take the vehicle for a test drive to determine if the check engine light returns
• Remove and clean the exhaust back pressure tube and sensor
• Repair or replace other open or shorted wiring or connectors of all circuits
• Replace the solenoid