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1998 Plymouth Voyager 3.0L P0340 Code: Crankshaft or Camshaft Sensor Issue? Diagnostics & Fixes

Model: 1998 Plymouth Voyager Fault Code: P0340 Posted: 2012-05-20 05:31

I'm trying to get my 1998 Plymouth Voyager 3.0L running again after a long period of unemployment (four months without work). The van wouldn't start, so I replaced the crankshaft position sensor. After clearing the fault codes and attempting to start it multiple times, I received a DTC P0340 code. I'm confused because the 3.0L engine has a camshaft position sensor located inside the distributor — a component that is rarely known to fail. However, this code persists after replacing the crankshaft sensor. My question is: could it still be the crankshaft sensor? Or is it more likely related to the camshaft sensor or the Powertrain Control Module (PCM)? How can I properly check the wiring and connections to the camshaft position sensor? What diagnostic steps should I follow to determine whether the issue lies with the sensor, wiring, or the PCM itself? I have to drive over an hour to reach my vehicle, so every failed attempt costs me real money. Any practical advice or troubleshooting tips would be greatly appreciated. Thanks for your help! uga81

Related fault codes

P0340

Comments (5)

Anonymous 2012-05-20 05:46

The crankshaft sensor was replaced before any diagnostic codes were checked — that's important context. Based on my research, the P0340 code is most commonly caused by a faulty camshaft position sensor in this model. However, a bad crankshaft sensor can also trigger the same code, especially if it's not properly installed or has poor electrical connections. Also, I've seen many users ask how to verify fuel pump operation — it’s often overlooked but critical for engine startup. The wiring harnesses in older vehicles like the Voyager can be tricky to locate and inspect. Thanks for sharing, uga81!

Anonymous 2012-05-20 05:52

Could a faulty crankshaft sensor actually produce a P0340 code on this vehicle? I'm not certain if the sensor is positioned correctly or if it's making proper contact — that could be an issue. This seems like a common point of confusion, especially since the codes don't always match the expected failure mode. Thanks for your reply!

Anonymous 2012-05-20 07:49

Don’t get too frustrated — contributors to this forum have real lives and jobs that take priority over volunteering time. Yes, a failing crankshaft sensor can generate a P0340 code on the 1998 Plymouth Voyager. While distributor-related issues were common in older models, they’re not as frequent as sensor failures. Aftermarket crankshaft sensors are often unreliable — quality varies significantly. Wiring problems, especially in older vehicles like this one, are also very common and should be thoroughly checked.

Anonymous 2012-05-20 15:09

Compton, I apologize for the follow-up — I was trying to provide accurate information without making assumptions. While browsing online yesterday, I found a detailed post explaining how to use an OBD-II scanner or multimeter to test sensor signals and pinpoint whether the issue is with the sensor, wiring, or PCM. Unfortunately, I can't locate that specific resource now, but it’s definitely worth checking for more precise diagnostics.

Anonymous 2012-05-22 16:27

No assumptions are being made — all of this information is based on years of hands-on experience working with Chrysler vehicles. I believe you're right: the original post likely contains a better, more detailed explanation that might help clarify the root cause. Thanks for pointing that out!