P1391 Intermittent Loss of Cmp Or Ckp

P1391 is a diagnostic trouble code (DTC) that indicates an intermittent loss of the crankshaft position sensor signal or camshaft position sensor signal. This DTC is common in vehicles with distributor-less ignition systems and can be caused by several factors including a faulty crank/camshaft position sensor, bad wiring, or dirty connections.

It’s important to diagnose and repair this issue immediately as it can lead to engine misfires, rough idle, and poor fuel economy if left unchecked.

To do so you need to inspect the wiring harness for any damage or corrosion then check all related connectors for proper connection and cleanliness. You may also need to replace the crank/camshaft position sensors if they are found defective.

Intermittent loss of CMP or CKP can be a major issue for your vehicle’s engine. This type of malfunction occurs when the Camshaft Position (CMP) or Crankshaft Position (CKP) sensors stop working intermittently, which can lead to a variety of problems with your engine. Fortunately, P1391 is an error code that helps you diagnose the problem before it gets too serious.

If this code pops up on your diagnostic scan tool, it means that there is an intermittent fault in either the CMP or CKP sensor circuit. The most common causes of this issue are worn-out wiring and/or connectors, faulty sensors themselves, and even bad ground connections. In some cases, debris may have gotten into the system and damaged one or more components as well.

The good news is that fixing P1391 isn’t overly complicated if you know what you’re doing. First off, you should check all wiring and connectors associated with the CMP and CKP sensors for any signs of wear and tear or damage such as frayed wires or corroded terminals.

P1391 Code Dodge

If you’ve ever had a check engine light come on in your Dodge vehicle, chances are that you have encountered the dreaded P1391 code. This code indicates that there is an issue with the camshaft and crankshaft position sensor circuit. It can be caused by several factors, including a faulty camshaft or crankshaft position sensor, wiring issues, or even crankcase pressure problems.

In order to diagnose this code correctly and fix it properly, it’s important to understand what exactly it means and how to troubleshoot the problem.

The P1391 code is one of many trouble codes associated with various vehicles manufactured by Chrysler Corporation (Dodge). The “P” stands for Powertrain Diagnostic Trouble Code (DTC), which indicates that something is wrong with the powertrain system of your vehicle.

The specific 1391 number designates a malfunction in either the camshaft or crankshaft position sensors within your engine bay.

Read More About: P1281 Engine Operating Temp Below Acceptable Range

P1391 Chrysler

If you own a Chrysler, then you may have heard the term “P1391” before. But what is it? P1391 is an OBD-II diagnostic trouble code that identifies several issues with Chrysler vehicles.

It stands for misfire detection monitor stability which means that your vehicle’s engine has identified a misfire or irregularity in its performance. This could be caused by any number of things such as spark plugs, fuel injectors, or even worn-out timing belts and chains. The most common symptom of a P1391 code is hesitation when accelerating from a stop or slow speed.

You may also notice your car jerking or surging while driving at highway speeds as well as reduced power output from the engine overall. If you experience these symptoms and have had your vehicle scanned for codes using an OBD-II scanner, then chances are high that you have received this particular error code: P1391 – Misfire Detection Monitor Stability (MDMS). So how do you fix this issue?

The first step to resolving the issue is to determine what might be causing it in the first place.

P1391 Code Jeep

If you own a Jeep, chances are you’ve heard of the P1391 code. This diagnostic trouble code indicates an issue with your vehicle’s camshaft position sensor (CMP) circuit. The CMP is responsible for monitoring the position of the camshaft and relaying this information to the onboard engine control module (ECM).

When there is an issue in this area, it can cause your Jeep to experience performance issues such as rough idling or stalling out completely when coming to a stop.

Luckily, diagnosing and resolving this specific trouble code isn’t too difficult if you know what steps need to be taken. First off, it’s important that you use an OBD-II scanner capable of reading Jeep codes in order to properly diagnose the problem.

Once connected, read through any stored codes and look for one labeled P1391—this will indicate that there’s a problem with your CMP circuit. From here on out all that needs to be done is locate and replace the faulty part causing your CMP circuit trouble; most likely either an old or malfunctioning camshaft position sensor itself or its wiring harness/connector.

P1391 Dodge Dakota

If you’re looking for a reliable and dependable pickup truck, the Dodge Dakota is a great option. The Dodge Dakota has been around since 1987 and continues to be one of the most popular mid-sized trucks on the road today. One of its main features is its P1391 engine code, which stands for “Powertrain Control Module – Powertrain Control System Performance Problem”.

This code indicates that there may be an issue with the powertrain control system in your vehicle. The powertrain control system (PCM) is responsible for managing all aspects of your vehicle’s performance from fuel delivery to ignition timing and more.

If something goes wrong with this system, it can cause serious problems such as poor acceleration or other issues related to engine performance.

It’s important to address any problems associated with the PCM right away before they lead to more serious damage down the line. One of the most common causes of P1391 errors in Dodges Dakotas is due to faulty oxygen sensors or vacuum leaks in your intake manifold that are not addressed quickly enough.

P1391 Ford Ranger

If you own a Ford Ranger, then you are likely familiar with the infamous P1391 code. The P1391 code is one of the most common diagnostic trouble codes that can appear in any Ford Ranger produced from 1996 to 2011. It can be caused by a variety of issues related to your engine’s spark plugs and ignition system, but it typically indicates an issue with the camshaft position sensor circuit.

This blog post will provide detailed information on what causes this OBD-II code, how to diagnose it, and how to fix it if necessary. What Causes The P1391 Code? The most common cause for a Ford Ranger’s P1391 code is due to an issue with its camshaft position (CMP) sensor circuit.

This could include faulty wiring or connections between the CMP sensor and other components within its electrical circuit such as relays or PCMs (powertrain control modules). Additionally, there may be either internal damage within the CMP sensor itself or contamination from dirt or oil which has entered into the connector pins; both instances would also trigger this OBD-II fault code.

P1391 Ram 1500

If you’re looking for a reliable pickup truck that offers plenty of power and an impressive towing capacity, the P1391 Ram 1500 is worth considering. This full-size pickup has been around since 1994, and it’s still a popular choice among drivers who need something capable of hauling heavy loads. The first thing that stands out about the P1391 Ram 1500 is its 3.6L V6 engine.

This powerful engine provides 305 horsepower and 269 lb.-ft of torque – enough to tow up to 9,290 pounds when properly equipped! It also features variable valve timing (VVT) technology which helps improve fuel efficiency without sacrificing performance.

Additionally, it comes with an 8-speed automatic transmission that delivers smooth shifting and responsive acceleration no matter what terrain or load you’re tackling.

In terms of safety features, the P1391 Ram 1500 includes several advanced systems like hill start assist control (HAC), electronic stability control (ESC), trailer sway damping system (TSDS), adaptive cruise control with stop/go capability (ACC+SG) as well as blind spot monitoring with rear cross path detection(BSM/RCPD).

P1391 Timing Chain

If you’re looking for reliable engine performance and a long-lasting vehicle, then the P1391 timing chain is an excellent choice. This durable component is designed to keep your engine running smoothly and efficiently by precisely controlling the timing of the valve opening and closing.

It’s an essential part of any modern car or truck engine, as it helps ensure that all components are operating in sync with one another.

So what exactly does the P1391 timing chain do? Put simply, it synchronizes the camshafts with each other so that they can rotate at different speeds without incident. The camshafts control when valves open and close within your engine’s cylinders, allowing air and fuel to enter during combustion cycles.

Without this precise synchronization from a high-quality timing chain like P1391, your car won’t be able to function properly; therefore it should be checked regularly for wear or damage.

The good news is that quality aftermarket manufacturers offer upgraded versions of this part which are more resistant to wear than traditional metal chains due to their construction materials (usually made of plastic).

P1391 Jeep Xj

If you’re the proud owner of a Jeep XJ, then you know that it can be susceptible to various problems. One particular problem is P1391, which occurs when your engine misfires or stalls due to an issue with its camshaft position sensor. This code indicates a malfunction in the computerized monitoring system of your vehicle and should be addressed as soon as possible.

In this blog post, we’ll discuss what causes P1391 in Jeep XJs and how to diagnose and repair it. P1391 is caused by either a mechanical or electrical issue within your vehicle’s camshaft position sensor (CPS). The CPS helps the computer system monitor the speed at which each cylinder fires off spark plugs for combustion purposes; if something goes wrong here, it can cause stalling or misfiring during operation.

It could be that there’s simply dirt on the sensors – resulting in false readings – or perhaps there are broken wires somewhere along the line leading up to them. Either way, troubleshooting should begin with inspecting these components closely for signs of damage or wear-and-tear over time due to heat exposure from nearby exhaust parts like catalytic converters, etc.

P1391 Intermittent Loss of Cmp Or Ckp

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What is Diagnostic Code P1391?

Diagnostic code P1391 is a trouble code that indicates an issue with the camshaft position sensor (CMP) circuit on a vehicle’s engine. This code is stored in the powertrain control module (PCM), which monitors and controls the various components of a car’s computer system. The CMP measures how far along its rotation cycle, or “position,” the camshaft has moved at any given time.

It uses this information to help determine when valves open and close, allowing for more efficient fuel combustion. When something goes wrong with this sensor, it can cause several issues such as misfires, poor acceleration, stalling engines, and difficulty starting your car.

One potential cause of diagnostic code P1391 could be an electrical issue related to wiring or connections in the CMP circuit. If there’s too much resistance due to corrosion or other damage in those wires they may not be able to accurately transmit data from one component to another within this system.

How Do I Fix Code P0339?

If you own a vehicle and are dealing with an engine problem, you’ve probably seen the dreaded “code P0339.” This code is an indication that your crankshaft position sensor has failed or is malfunctioning, which can cause numerous issues within your engine. In order to fix this issue, it is important to first understand what the crankshaft position sensor does and why it may have failed in the first place.

The crankshaft position sensor works alongside other components of your car’s computer system (ECU) to monitor and regulate engine performance by sensing the rotation of the crankshaft as it rotates through its various cycles. When this sensor fails or malfunctions due to wear or damage, it can cause misfire codes like P0339, as well as stalling and rough idle problems. Fortunately, fixing code P0339 isn’t too difficult if you know what you’re doing.

The most common solution for this issue is replacing the faulty crankshaft position sensor with a new one from your local auto parts store – make sure you get one that matches up with any specific fitment requirements for your particular model of car!

What Causes a Ckp Sensor to Go Bad?

When it comes to diagnosing engine problems, the crankshaft position sensor (CKP) plays a vital role. It helps ensure that the engine is running efficiently and smoothly by sending a signal to the computer telling it when to fire each spark plug. Unfortunately, this important component can sometimes fail or become damaged over time, which can lead to major issues if left unchecked.

So what causes a CKP sensor to go bad? There are several common reasons why a CKP sensor might stop working properly or even completely fail. One of these is exposure to extreme temperatures – either too hot or too cold – for extended periods of time.

This type of damage can be caused by an overly hot engine compartment due to insufficient cooling system maintenance, as well as improper storage in extreme weather conditions such as extremely cold temperatures during wintertime. Another potential cause is moisture getting into and corroding the electrical connections on the CKP sensor itself, which will eventually lead it to malfunction and render it ineffective at providing reliable readings.

Fix & Repair a P1391 Code on a Jeep Wrangler, Cherokee, or Similar


If you’re having trouble with your vehicle’s engine, it could be due to an intermittent loss of CMP or CKP. This issue can cause the engine to stall and not run as smoothly as it should. It is important to diagnose and repair this issue quickly, so your car runs at its peak performance.

The most common causes for a CMP/CKP failure are corroded connectors, faulty wiring, damaged sensors or even a bad ECM. You may need to check all these components in order to identify the root of the problem. If you suspect that any of these parts are malfunctioning, then it is wise to replace them with new ones before attempting further repairs on your own.

Finally, if all else fails then professional help from a mechanic might be necessary in order to get your car running again!