engine

Crankshaft Position Sensor

for 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD

Difficulty

Moderate

Time

1.6 h

Tools

Steps

Replace the crankshaft position sensor on a 2014 Ram 2500 with 6.7L Cummins diesel engine to restore engine position signal and correct starting or running issues.

Warnings

⚠Engine must be completely cool before starting work to prevent burns from hot components

⚠Do not crank engine with sensor disconnected or removed as this may set fault codes

ℹ️The crankshaft position sensor is critical for engine operation - handle with care and avoid dropping or striking the sensor tip

Tools required

10mm socketEssential

Socket wrench with extensionsEssential

Torque wrench (10-100 Nm range)Essential

Flathead screwdriver

Needle nose pliers

Shop towelsEssential

Parts cleaner/brake cleanerEssential

Wire brush

Flashlight or inspection lightEssential

Oil drain pan (small)

Parts

Crankshaft position sensor × 1 — Mopar 68105030AB or equivalent
Crankshaft position sensor O-ring × 1 — Use OEM specification

Preparation

Park vehicle on level ground and engage parking brake
Allow engine to cool completely (at least 2 hours after operation)
Disconnect negative battery cable to prevent accidental starter engagement
Ensure adequate lighting and access to the driver's side of the engine near the bellhousing area

Procedure

1
Locate the crankshaft position sensor
The crankshaft position sensor is mounted on the driver's side of the engine block, near the bellhousing area between the engine and transmission. It is positioned above the starter motor. Use a flashlight to identify the sensor - it will have a single electrical connector and is threaded into the engine block housing.
2
Disconnect the electrical connector
Press down on the red locking tab of the electrical connector to release it. Pull the connector straight away from the sensor body. If the connector is tight, gently wiggle it while pulling. Do not pull on the wiring harness itself.
3
Remove the sensor mounting bolt
Using a 10mm socket with extension, remove the single bolt securing the crankshaft position sensor to the engine block. The bolt is located on top of the sensor body. Keep the bolt in a clean location for reinstallation.
Torque spec
Crankshaft Position Sensor10 Nm (7 lb-ft)
4
Extract the crankshaft position sensor
Carefully pull the sensor straight out of the engine block. The sensor may have residual oil on it. If the sensor is stuck, gently twist while pulling - do not pry against the sensor body. Place the old sensor on a clean shop towel. Note: A small amount of engine oil may drip from the sensor bore.
5
Inspect the sensor bore and mounting area
Clean the sensor mounting surface on the engine block with brake cleaner and a shop towel. Inspect the sensor bore for debris, metal shavings, or damage. Use a flashlight to look inside the bore - it should be clean and free of obstructions. If necessary, carefully clean with brake cleaner on a shop towel. Do not insert tools into the bore.
6
Prepare the new sensor
Inspect the new crankshaft position sensor for any damage to the tip or connector. Verify the O-ring is properly seated in the groove on the sensor body. If installing a separate O-ring, lightly lubricate it with clean engine oil. Do not use excessive lubricant as this can attract debris.
7
Install the new crankshaft position sensor
Carefully insert the new sensor straight into the engine block bore. Push the sensor in by hand until it is fully seated against the mounting surface. The sensor should slide in smoothly without force. Do not twist or angle the sensor during installation as this could damage the O-ring or sensor tip.
8
Torque the sensor mounting bolt
Install the sensor mounting bolt and hand-tighten. Using a torque wrench with 10mm socket, torque the bolt to 10.0 Nm (7.0 lb-ft). This is a light torque specification - do not overtighten as this can damage the sensor housing or strip the threads in the engine block.
Torque spec
Crankshaft Position Sensor10 Nm (7 lb-ft)
9
Reconnect the electrical connector
Push the electrical connector firmly onto the sensor until you hear and feel it click into place. The red locking tab should engage automatically. Gently tug on the connector to verify it is securely locked. Ensure the wiring is routed away from hot exhaust components and moving parts.
10
Reconnect the battery and clear codes
Reconnect the negative battery cable. If a scan tool is available, clear any stored diagnostic trouble codes related to the crankshaft position sensor (P0335, P0336, P0337, P0338, P0339). This step is optional but recommended to verify proper repair.

Reassembly

Ensure all electrical connections are secure and properly locked
Verify no tools or parts were left in the engine compartment
Double-check that the sensor mounting bolt is properly torqued to specification

Verification

Start the engine and verify it starts normally without extended cranking
Allow engine to idle and confirm smooth operation with no misfires or rough running
Check that the check engine light does not illuminate after starting
If a scan tool is available, verify crankshaft position sensor signal is present and reading correctly (RPM signal matches actual engine speed)
Test drive the vehicle to ensure normal acceleration and performance under various load conditions