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P0335 and P0344 Faults in 2005 Jeep Wrangler X 4.0L 6-Cylinder - Diagnosis and Solutions

Model: 2005 Wrangler Fault Code: P0335 Posted: 2015-08-23 09:37

I own a 2005 Jeep Wrangler X with a 4.0L 6-cylinder engine and manual transmission. The vehicle randomly dies while idling or driving. After turning off the key and restarting, it runs for a short time before dying again. Initially, I suspected a faulty crankshaft position sensor (CKP), but diagnostic trouble codes P0335 (Crankshaft Position Sensor A Circuit Malfunction) and P0344 (Camshaft Position Sensor 'A' Circuit Intermittent) were detected. Both sensors were replaced, and all ground connections were cleaned. However, after the replacement, a new P0344 code appeared, followed by a return of P0335 after cleaning grounds again. This recurring pattern has led me to suspect an issue with the Oil Pump Drive Assembly (OPDA). Given that my vehicle does not exhibit the typical squealing sound associated with worn OPDA components, I'm unsure whether this is truly the root cause. What are the most reliable diagnostic steps for identifying whether the problem lies in the sensors or deeper system components like the OPDA?

Related fault codes
P0335P0344
Comments (5)
Anonymous 2015-08-23 16:32

This issue isn't easily resolved with basic troubleshooting. To properly assess CMP and CKP sensor signals, a lab scope is essential—use it to monitor waveform stability and detect signal drops. Additionally, check for sync data using an OBD2 scanner; inconsistencies in timing could point to a deeper problem. Don’t overlook the freeze frame data, as it may reveal patterns during failure events. Regarding OPDA: yes, this is a known issue on 2005 Wranglers. The only definitive way to confirm damage is through physical inspection. Jeep vehicles are sensitive—using OEM-quality sensors is critical. I recommend acquiring a proper scanner and lab scope for accurate diagnosis.

Anonymous 2015-08-24 12:49

I installed OEM-grade crankshaft and camshaft position sensors, as I’ve heard many users face reliability issues with aftermarket parts. The challenge with diagnosing OPDA problems is that the typical oil pump drive gear wear produces a distinct squealing noise—something I don’t hear in my vehicle. If the issue lies within the OPDA pickup, it's difficult to detect without specialized tools or direct inspection. While I’m considering taking it to a shop, I hope there’s a non-dealer solution available.

Anonymous 2015-08-24 13:01

It's not about going to the dealer—it's about having the right tools. A lab scope is necessary for viewing actual sensor waveforms, and an OBD2 scanner can help verify engine sync data. These diagnostics are critical for accurate root cause identification.

Anonymous 2015-08-24 13:46

Agreed—without proper diagnostic equipment like a lab scope or a scanner capable of checking signal sync, it's difficult to perform an effective diagnosis. I do most of my own work, but I don’t have access to such tools. My next step is to locate a local shop equipped with the right gear for this type of repair.

Anonymous 2016-12-05 09:57

I previously experienced a check engine light and P0344 code on my 2005 Jeep Wrangler X 4.0L. The issue was resolved by reflashing the Powertrain Control Module (PCM) with the latest software update, as outlined in Service Bulletin 18-015-09: 'SUBJECT: Flash: MIL Illumination Due To Diagnostic Trouble Code P0340 Or P0344'. This fix is covered under a lifetime warranty and should be free. However, I was charged a diagnostic fee when taking it to a dealer—this cost may be avoidable if you have the TSB documentation. There are several other 2005 Wrangler service bulletins related to PCM behavior and OBD/PDC systems. Notably, Service Bulletin 18-028-06 addresses faulty wiring on the OBD system, which can cause 'Not Ready' emission test failures—this issue is also covered under a lifetime warranty with no cost to the owner. Always check for these TSBs before assuming hardware failure.