What this code means
P0335 may mean the PCM is not seeing a reliable crankshaft position sensor signal.
What the vehicle may do
- The engine may crank longer than normal.
- The engine may still start after a delay.
- The MIL may illuminate.
- Stop/start may be disabled when the code is active.
Possible fault areas
- Possible CKP sensor concern.
- Possible 5-volt supply, signal, or sensor ground circuit concern.
- Possible connector, terminal, wiring, or water intrusion concern.
- Possible sensor mounting area or target wheel concern.
- Possible PCM concern.
Diagnostic path
Code overview
On this Ram 1500 with the 3.6 Pentastar, P0335 is a crankshaft position sensor circuit fault. In plain terms, the PCM may not be getting a crankshaft position signal it can trust. The engine may crank longer than normal, may still start after a delay, and the MIL may come on. If stop/start is equipped, that feature can be disabled while the code is active. Broadly, this can involve the CKP sensor, its 5-volt feed, signal, or ground circuits, connector problems, the sensor mounting area, the target wheel or pulse ring, or a possible PCM concern. Start with the basic system checks before getting into circuit testing.
How the code sets
This monitor runs continuously while the engine is cranking and while it is running. During cranking, the code can set if the CKP signal cannot be locked for more than approximately 2.5 seconds after the CMP signal is locked. With the engine running, it can also set if the PCM loses crank position and cannot re-lock within approximately 0.15 seconds. Treat those as the operating conditions you want to reproduce when you verify whether the fault is current or intermittent.
Start with updates, then confirm the fault
First, check for any applicable bulletins or PCM software updates related to P0335. If one applies, complete that repair path and then verify the repair. If nothing applies, scan all modules, record the codes and the environmental data, and save the scan report for the repair record. Clear the codes, turn the ignition off for a minimum of 10.0 seconds, turn the ignition back on, then operate the vehicle under the same type of conditions that set the code. Read codes again. If P0335 returns, move into the electrical checks. If it does not return, treat it like an intermittent and inspect the harness and sensor area next.
Intermittent path: harness, connector, and repair history
For the intermittent path, turn the ignition off and verify the CKP sensor connector is fully seated and the primary lock is engaged before disconnecting anything. Start the engine and wiggle test the CKP wiring harness and connectors to try to duplicate the concern. Then turn the ignition off, disconnect the PCM and crank sensor connectors, and inspect for chafed or rubbed wiring, pushed-out terminals, bent terminals, water intrusion, corrosion, and connector or component damage. Also look closely at the crank sensor mounting area for debris, damage, or a loose sensor. If you find a problem, make the appropriate repair and verify it. If you do not find a problem, check the vehicle history for previous crank sensor related faults within the past 90 days, and also check whether the vehicle was serviced for a crank sensor fault within the past 30 days. If it was serviced recently and the crank sensor was replaced, wiggle test again, and if you still cannot duplicate it, remove the sensor and inspect the mounting location and target wheel with a borescope while slowly rotating the engine by hand at the crank damper bolt. Repair as necessary, perform the Cam/Crank Relearn Procedure, and verify the repair. If it was serviced recently but the sensor was not replaced, replace the crank sensor, perform the Cam/Crank Relearn Procedure, and verify the repair. If there is no recent repair history, reconnect the harness connectors, erase the code, and the most likely cause was a poor connection at one of the harness connectors.
Current fault path: check for shared 5-volt issues
If P0335 comes right back, look at the recorded codes before probing the CKP circuit. If any 5-volt reference codes are present, diagnose those first because a shared 5-volt problem can mislead the crank sensor diagnosis. If there are no 5-volt reference codes, continue with the CKP circuit checks.
Check the CKP 5-volt supply and signal bias
Turn the ignition off, disconnect the CKP sensor connector, and turn the ignition on. Measure the F855 5-Volt Supply circuit at the CKP connector. It should be between 4.8 and 5.2 volts. If it is below 4.8 volts, repair the 5-Volt Supply circuit for an open or high resistance. If it is above 5.2 volts, repair the 5-Volt Supply circuit for a short to voltage. If the supply is in range, measure the CKP K24 Signal circuit at the CKP connector. That circuit should also be between 4.8 and 5.2 volts. If the signal voltage is in range, move to the sensor ground check. If it is not in range, go to the signal circuit short-to-ground check.
Check sensor ground, then inspect the target wheel
For the sensor ground check, turn the ignition off, disconnect PCM connector C2, and measure resistance on the K925 Sensor Ground circuit between the CKP connector and PCM C2. The resistance should be below 3.0 Ohms. If it is not below 3.0 Ohms, repair the sensor ground circuit for an open or high resistance and verify the repair. If ground is good, disconnect the battery ground cable, remove the CKP sensor, and inspect the sensor mounting location for damage or foreign material. Rotate the engine and inspect the target wheel through the CKP sensor bore if possible. With stamped steel targets, watch the borescope light reflection on each tooth; a bent tooth will move the bright spot compared to the others. With powder metal targets, look for a tooth that appears dull or non-reflective compared to the others, which can indicate a broken tooth. If you find a mounting-area or target-wheel problem, repair the mounting issue or repair or replace the target wheel or pulse ring as necessary, then perform the Cam/Crank Relearn Procedure and verify the repair. If no problem is found here, replace the crank position sensor, perform the Cam/Crank Relearn Procedure, and verify the repair. That relearn matters every time there has been a repair or replacement made around a CMP sensor, CKP sensor, flywheel, valvetrain, timing chain, or gears, because skipping it can cause a misfire fault to set.
If signal voltage is not in range, check the signal circuit integrity
When the CKP signal voltage is not in range, turn the ignition off, disconnect PCM connector C2, and check continuity between ground and the CKP K24 Signal circuit at the CKP connector. If there is continuity to ground, repair the signal circuit for a short to ground and verify the repair. If there is no continuity to ground, measure resistance of the CKP K24 Signal circuit between the CKP connector and PCM C2. The resistance should be below 3.0 Ohms. If it is not below 3.0 Ohms, repair the signal circuit for an open circuit or high resistance and verify the repair. If the signal circuit passes, continue to the final connection checks.
Final connection checks and verification
At the end of the diagnostic path, complete any applicable bulletin work, then disconnect all PCM connectors, any related in-line connectors if equipped, and the related component connectors. Inspect the connectors and terminals for corrosion, water intrusion, weather seal issues, overheating, pushed-back terminals, spread terminals, and terminal tension problems. Repair anything you find. Reconnect the PCM, in-line, and component connectors, making sure everything is fully seated and locked. Clear the codes, operate the vehicle under the monitored conditions, and read codes again. If P0335 returns after these checks, replace and program the PCM, then verify the repair. If it does not return, the wiring or poor connection problem has been repaired. The takeaway is simple: prove the code is current, separate intermittent connector issues from hard circuit faults, verify the 5-volt, signal, and ground paths, and do not overlook the sensor mounting area or target wheel. For more diagnostic training, visit stepdiagnostics.com.
Final check
P0335 often needs a structured check of the fault state, the CKP circuits, connector integrity, and the mechanical target before calling the repair.
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