P0849 - OBD Trouble Code

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Is your car ever diagnosed with OBD error P0849? Did your mechanic told you that it's some problem related to your vehicle’s transmission fluid level sensor? Were you able to understand him completely? Well, if not then we are here to help you out! We have detailed information on error code P0849 for you to have a look. Chances are that after reading all the information you will be in a position to understand your car problem completely. Maybe you can solve it yourself too, so why not read through it?

P0849 error code is related to your vehicle’s transmission fluid pressure sensor circuit “B”. OBD error code P0849 will be set by your vehicle’s transmission control module or powertrain control module when it senses some issues with the pressure switch or the hydraulic switch. To know about its few common causes, take a look at the section below.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch "B" Circuit Intermittent?

• Low transmission fluid levels
• Dirty or contaminated transmission fluid
• Internal transmission mechanical issues
• Faulty powertrain control module
• Malfunctioning electronic pressure control solenoid
• Bad transmission fluid pressure sensor
• Internal transmission having hydraulic blockages
• Bad hydraulic pump
• Faulty transmission control module

1. Transmission Control Module - If you are looking for TCM to fix your problem, then we have good news for you. We have in stock TCM’s for all make and models and that too at best prices.
2. Digital Voltmeter - if you are in need of digital voltmeter and other diagnostic tools to become that DIY guy, then you can simply browse through the website and get your hands on the best diagnostic tools.
3. Powertrain Control Module - Looking for Powertrain Control Module, commonly known as PCM? If yes, then have a look at our collection.
4. Transmission Fluid Pressure Sensor - If you are facing OBD error code P0849, chances are that something is wrong with your transmission fluid pressure sensor. If you wish to correct this problem, you can shop high end transmission fluid pressure sensors and other parts with us.
5. Automatic Transmission Module - since OBD error code P0849 might be caused by few damaged automatic transmission control modules, you might need brand new ones to fix the issue.
6. Engine Control Module - chances of your ECM going wrong is quite low for this issue, but if you still face problems with it you can find quality ECM’s with us.

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P0849.

Common Symptoms

• Flashing of check engine light
• Fall in fuel efficiency
• Physical Symptoms
• Severe transmission problems
• Transmission slipping
• Transmission overheating
• Transmission entering into limp in mode
• Failing torque converter clutch

Once you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle.

• Cleaning or fixing the hydraulic blockages in the transmission system
• Undergo electronic pressure control solenoid replacement
• Repair or replace the electronic pressure regulator
• Make sure to get rid of the faulty fluid pressure sensor
• Repair or replace the faulty electrical components in the transmission system
• If, transmission fluid level is low, make sure to top it up to desired levels
• Undergo hydraulic pump replacement
• Replace or reprogrammed the faulty powertrain control module

If you need parts to fix this issue, you no longer need to search for them. We at Parts Avatar Canada have an extensive range of auto parts in stock from you, ranging from all replacement parts to all interior and exterior parts like Transmission control module, Digital voltmeter, Powertrain control module Transmission fluid pressure sensor, Automatic transmission module, PCM, ECM.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

To diagnose this error code, you will need and advanced scanner, digital volt/ohmmeter, manual pressure gauge, a hydraulic pressure diagram, and a manufacturer's wiring diagram to properly diagnose a P0849 trouble code. Once you get hold of all these equipment’s you will need to follow the following steps:

Use the technical service bulletins specific to your vehicle’s make and model to help you understand the problem properly. This will not only help you to understand the specific issue but also help you to understand steps on how to fix it. Believe us it will save you a lot of time and money while diagnosing not only this code but for any other code too. Also, you should start your diagnosis with all the power related error code or with the multiple code diagnosis as it will help you in understanding the reasons behind the error code P0849. Next on your list to do is to locate transmission fluid pressure sensor/switch on your vehicle to begin with the specific diagnosis. It will likely be attached to your vehicle’s valve body side inside the transmission.

Once you figure out its location, next step for you to do is to check the connectors and wirings for any loose ends, bare wires, rubbing, scraping, burn spots or melted plastics. Now, take the connector apart and inspect the terminals very carefully inside the connector. Make sure that they don’t look burnt or have a green tint indicating corrosion. Make use of an electrical contact cleaner and a plastic bristle brush if cleaning of the terminals needs to be cleaned. Let dry and apply electrical grease where the terminals contact.

Next step is to use a scan tool and clear all the existing trouble code from memory, and check if the P0849 code returns. In case it does not then the problem was mainly with the connectors only. In case it does return then the connections were most likely your problem. This is a common area of concern for this code, as the external transmission connections have the greatest number of issues with corrosion. In case the code returns, then you will need to inspect the TFPS sensor and all the related connectors and circuits. Turn off the key and disconnect the electrical connectors at the TFPS sensor. Now, connect the digital voltmeter either to the ground or to the low reference terminal at the TFPS sensor wiring harness connector. Also connect the red lead of the DVOM to the signal terminals at the TFPS sensor wiring harness connector.

Now, turn on the key and check for the manufacturer’s specifications. Make sure that the voltmeter reads either 12 volts or 5 volts. Wiggle the connections to check if they change. In case the voltage is incorrect, repair the power or ground wire, or replace the PCM/TCM. Now, if this test is passed then connect one lead of an ohmmeter to the signal terminal at the TFPS sensor and the other lead to the ground or low reference terminal at the sensor. Next, check for the manufacturer’s specifications on the resistance of the sensor to accurately test the resistance to pressure when there is no pressure applied to it. Again, wiggle the connector at the Transmission Fluid Pressure Sensor/Switch while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS.

If you still continue to get the P0849 error code in spite of passing all these prior tests then it is signalling a failed TFPS sensor, although a failed PCM/TCM could not be ruled out, nor could internal transmission malfunctions until the TFPS sensor had been replaced. If you are in doubt, we suggest you to seek help from a trained automotive diagnostician. PCM/TCMs must be programmed or calibrated to the vehicle in order to be installed correctly.

Common Mistakes When Diagnosing the P0849 Code

Most likely the P0849 code is taken as a major issue with the automatic transmission. While this might be valid, it is similarly as likely that the issue is either electrical or due altogether too old, low, or messy liquid in the transmission. One must consider this while diagnosing this error code in order to avoid any misdiagnosis.