Boost Pressure Sensor

Replace the boost pressure sensor on the 5.9L Cummins intake manifold to restore proper boost pressure readings and engine performance monitoring.

Warnings

Tools required

Parts

• Boost pressure sensor (MAP sensor) × 1 — Use OEM Mopar or equivalent (2-wire sensor 1994-1998, 3-wire sensor 1998.5-2007)

Preparation

1. Park vehicle on level surface and set parking brake
2. Allow engine to cool completely (minimum 2 hours after operation)
3. Disconnect negative battery cable to prevent electrical issues
4. Locate boost pressure sensor on driver's side of intake manifold near front (silver cylindrical sensor with electrical connector)

Procedure

1. 1

   Disconnect electrical connector
   Release the connector locking tab (press or lift depending on connector style) while pulling straight back away from the sensor. Do not twist or pull on the wires themselves. If connector is stuck due to corrosion, carefully use a small flat blade screwdriver to gently pry the locking tab while pulling.
2. 2

   Clean sensor area
   Use shop towels to clean around the sensor mounting area to prevent dirt and debris from falling into the intake manifold when the sensor is removed. Pay special attention to the area around the sensor threads.
3. 3

   Remove boost pressure sensor
   Using the appropriate wrench or socket for your sensor style, carefully remove the boost pressure sensor (unscrew threaded sensors counterclockwise, or remove the retaining bolt/clip for push-in style sensors). Support the sensor body with your hand as you remove it to prevent it from falling. Handle the sensor carefully during removal; note any oil residue on the sensor tip, which may indicate turbocharger seal issues.
4. 4

   Inspect manifold port
   Examine the threaded port in the intake manifold for damage, debris, or carbon buildup. Clean threads if necessary using a shop towel. Do not allow any debris to fall into the manifold opening. Inspect the old sensor for oil contamination which may indicate turbocharger seal issues.
5. 5

   Install new boost pressure sensor
   Thread the new boost pressure sensor into the intake manifold by hand, turning clockwise until finger-tight. Ensure the sensor threads smoothly without cross-threading. The sensor should thread in easily for the first few turns.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
6. 6

   Torque boost pressure sensor
   Using a torque wrench with the correct socket/adapter for your sensor style, tighten the boost pressure sensor or its retaining fastener to the manufacturer-specified torque (verify value in Cummins/Mopar service data before final tightening). Do not overtighten as this can damage the sensor housing or strip the aluminum threads in the intake manifold.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
7. 7

   Reconnect electrical connector
   Clean the electrical connector terminals with electrical contact cleaner if corrosion is present. Push the electrical connector straight onto the sensor until you hear and feel a distinct click from the locking tab. Gently tug on the connector to verify it is fully seated and locked.
8. 8

   Reconnect battery
   Reconnect the negative battery cable. The PCM will need to relearn idle and boost parameters through normal driving.

Reassembly

1. Ensure electrical connector is fully locked onto sensor with audible click
2. Verify no tools or shop towels were left in engine compartment
3. Double-check torque on sensor to prevent boost leaks

Verification

• Start engine and verify no fault codes are present using a scan tool
• Check for boost leaks around sensor threads (listen for hissing while engine idles)
• Test drive vehicle and verify boost pressure readings are normal (typically 0-35 PSI depending on load)
• Confirm check engine light does not illuminate after 2-3 drive cycles
• Scan tool should show smooth boost pressure readings that increase with throttle application

Related trouble codes on this vehicle

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