Error Code P0842: What It Means & What To Do?

If you are facing OBD error code P0842, then you might face some shifting issues with your vehicle’s transmission. Error code P0842 will be set by your vehicle’s ECM/PCM when they detect problems with the transmission fluid level sensor circuit “A” being low. OBD code P0842 is an electrical issue but it might be caused due to some mechanical issues such as internal leaks, cracked balls in the valve body, low system operating and stuck in valve in the valve body. This is a serious problem and you just can’t afford to overlook it especially when you are dealing with an intermittent problem. Eager to know what causes this problem with your vehicle? What all can relate to the occurrence of this vehicle? If YES, then we have worked out a list of few common causes behind it.

What causes this problem Transmission Fluid Pressure Sensor/Switch "A" Circuit Low?

• Low level of transmission fluid
• Wrong or dirty transmission fluid
• Malfunctioning of the transmission fluid pressure sensor/switch 'A' might become a potential reason
• Bad and faulty harnesses and connectors to the transmission fluid pressure sensor/switch 'A'
• There might be an open or shorted transmission fluid pressure sensor/switch 'A' circuit
• Bad transmission control module (TCM)

1. Transmission Control Module - There could be a problem with your vehicle’s TCM, but don’t let that hold you back. Our PartsAvatar website is the best place to find the most efficient and cost-effective transmission parts for your car.
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4. Transmission Fluid Pressure Sensor - looking for transmission fluid pressure sensor to solve this problem? If YES, then we have good news for you. You can shop with us premium transmission fluid pressure sensor for your specific vehicle in no time. So, what are you waiting for?
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7. Engine Control Module - Defective or damaged ECM can become a potential cause for many issues related to error code P0842. So why not check and replace the damaged ones

Willing to know some common symptoms of OBD Code P0842? Your wish is our demand. Have a look at them below:

Common Symptoms

• Illumination of check engine light
• There might be changes in the shift quality
• Limp in mode will set in 2nd or 3rd gear

We have listed out some ways which would help you to correct the occurrence of OBD Code P0842. They are mentioned here as follows:

• Repair or replace the faulty transmission fluid pressure sensor
• Check and replace all the related wiring and connectors if found faulty
• Do check your vehicle’s powertrain control module and transmission control module for any fault or defect. If found faulty, you will definitely to replace it

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

First of all, refer to a technical service bulletins, specific to your vehicle’s make and model. 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 P0842. 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 P0842 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 P0842 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 P0842 Code

Few of the common mistakes that you can commit while diagnosing this P0842 generic obd codes are listed as follows:

• Failing Transmission Control Module (TCM)
• Pretty low Transmission fluid level
• Failing Transmission fluid pressure sensor
• Wiring issue