2015 jeep patriot crankshaft position sensor problems

The Jeep Patriot utilizes a crankshaft position sensor in order to regulate the engine timing. This sensor uses a reluctor to gauge the position of the crank. When the Patriot’s ECM determines that there is an issue with the signal coming from this sensor, it’ll throw the P0335 trouble code.

P0335 Symptoms: Jeep Patriot

Depending on the model year and engine of any vehicle the job of the crankshaft sensor is going to change.It’s either going to provide info to the ECM to keep the vehicle from misfiring. Or, it’ll provide necessary data to keep the engine timing in order.

Depending on whether or not the engine timing is dependent on the crank sensor is going to determine whether the symptoms of P0335 are going to be:

• Vehicle won’t start at all (timing dependent)
• Rough running motor

Often, if the crankshaft sensor or wiring itself is bad, there won’t be any RPM reading form the tachometer.

Patriot P0335 Causes

Most of the time, the crankshaft sensor is going to be the cause of P0335, or the wiring will be at fault. There are other causes as well.There’s more on that directly below.

Bad Crank Sensor

The crankshaft sensor is often the reason that P0335 is thrown. They aren’t very expensive, but they can be difficult to get to in order to service them. If you think you’re up to the challenge (and know how to use a volt meter) this guide from doityourself.com will show you exactly how to test the sensor.

Reluctor Ring

The crank sensor operates by scanning a “reluctor wheel”. This wheel can become damaged over time and will no longer give a proper reading to the ECM.

One of the most common symptoms of a bad reluctor ring is going to be a rattling sound. If the engine still runs, you will hear it. This means that it has been damaged, and no longer seated properly.

If you don’t hear a rattle, the ring could have broken or missing teeth. This will cause the vehicle to not get a good reading from the crank sensor.

Wiring Issues

Due to the location of the crankshaft position sensor, it is prone to damage. Start by inspecting the wiring harness between the firewall and crank sensor for any obvious damage. After that it would be prudent to look at the wiring harness plug at the sensor itself.

This YouTube video shows exactly how to test the wiring integrity.

Less Likely Reasons

Most of the time, the reasons outlined above are going to be the problem. But, not always. Here are some issues that are (not quite as) known to cause P0335 in the Patriot

Timing Belt/Chain– It is possible that a vehicle that has jumped timing is throwing the code. Here’s more on diagnosing a bad timing chainfrom this site.

PCM/ECM– When the vehicle’s ECM goes bad, it can throw false trouble codes. This is definitely not the place to start, but is worth looking at if nothing else seems to be wrong. Symptoms of a bad ECM (Autoblog).

Conclusion

Good luck determining what is causing P0335 in your Patriot. If you feel like there is anything you would like to add, please leave a comment below.

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How much does a Crankshaft Position Sensor Replacement cost?

On average, the cost for a Jeep Patriot Crankshaft Position Sensor Replacement is $117 with $22 for parts and $95 for labor. Prices may vary depending on your location.

Show example Jeep Patriot Crankshaft Position Sensor Replacement prices

What is the Crankshaft Position Sensor all about?

Many newer cars have computerized engine management systems that rely on sensors to report data to the computer. The crankshaft position sensor is used in conjunction with the camshaft position sensor to control ignition timing and to let the computer know when to inject fuel and provide spark sequence. Due to the mounting locations of this sensor, it is common for heat and oil leaks to cause this sensor to fail.

Keep in mind:

• Damage to the crankshaft position sensor is sometimes caused by leaking oil, which means there may be another component of your vehicle that needs replacement or repair.
• The electrical connector can also be damaged, and should be inspected every time the position sensor is replaced.

How it's done:

• Scan the car for trouble codes.
• Remove and replace crankshaft position sensor.
• Clear trouble codes.
• Check for the proper operation of the car.

Our recommendation:

The crankshaft position sensor will usually let you know when it needs replacing. The Check Engine warning light will illuminate and you may notice that your vehicle has a hard time starting or running smoothly. When you notice any of these signs, schedule an inspection.

What common symptoms indicate you may need to replace the Crankshaft Position Sensor?

• Car does not start.
• Check engine light is on.
• Car misfires (car runs rough).

How important is this service?

The crankshaft position sensor relays critical information to your vehicle’s computer management system. The sensor provides the management system with the information it needs to control ignition timing, and it lets the computer know when it needs to provide sparks and fuel. Without a functioning crankshaft position sensor, the computerized management system doesn’t receive this critical information, and the vehicle will either not start, or will misfire while you’re driving it.

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