Diagnosis And Testing - Turbocharger Boost Pressure

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Low turbocharger boost pressure can cause poor engine performance and driveability concerns.

Causes of low boost pressure include the following:

Restricted air inlet system
Leak in charge air cooler system
Restricted/high pressure drop across charge air cooler
Damaged turbocharger compressor wheel housing
Excessive exhaust restriction
Stuck or sticking variable geometry components
Stuck or inoperative variable geometry actuator

Causes of excessively high boost pressure include:

Damaged turbocharger actuator O-ring
Stuck or sticking variable geometry components
Stuck or inoperative variable geometry actuator

Visually inspect the turbocharger for debris or other foreign material:

Courtesy of CHRYSLER GROUP, LLC

Inspect the turbocharger impeller and housing for coking, debris, or other foreign material build-up.

Courtesy of CHRYSLER GROUP, LLC
If the turbocharger impeller or housing have excessive coking, debris or other foreign material build-up, then perform the Turbocharger System Cleaning Procedure. Refer to CLEANING .

Several Diagnostic Trouble Codes (DTCs) can be set that will indicate high or low system boost levels. Refer to the 6.7L DIESEL - DIAGNOSTIC CODE INDEX - 2500 HD .

Refer to COOLER AND HOSES, CHARGE AIR, DIAGNOSIS AND TESTING, 6.7L for diagnosing of low or high boost pressure due to leaks or restrictions.

NOTE:

If oil is present on either the inlet or exhaust side of the turbo charger, check the charge air cooler for evidence of oil. Clean charge air cooler and the turbocharger inlet and outlet of any oil before starting the engine.