Diagnostic Trouble Code (DTC) Information ECM-6806

Condition 

The diagnostic trouble code (DTC) is stored if the measured boost pressure from the boost pressure sensor (actual value) is lower or higher than the control module target value (desired value).

The fault is diagnosed by the engine control module (ECM) when the engine speed (RPM) and load are above a certain value.

Substitute Value 

Reduced boost pressure through full opening of the boost pressure control valve.

Possible Source 

Signal too high 

• The pressure servo for the boost pressure control (BPC) valve is incorrectly adjusted
• Sticking boost pressure control (BPC) valve
• Damaged turbocharger (TC) control valve.

Signal too low 

• The hoses between the pressure servo for the boost pressure control (BPC) valve and the turbocharger (TC) control valve have come loose or are blocked or damaged
• The hoses between the turbocharger (TC) control valve and the charge air pipe (between the turbocharger (TC) and the charge air cooler (CAC)) are blocked or damaged
• The pressure servo for the boost pressure control (BPC) valve is incorrectly adjusted
• Damaged boost pressure control (BPC) valve pressure servo
• Sticking boost pressure control (BPC) valve
• Damaged turbocharger (TC) control valve.

Fault symptom[s] 

• Poor performance.