Joined
Oct 9, 2014 · 3 Posts
Discussion Starter · #1 · Oct 10, 2014 Hi, I'm new to this forum. I have a 2012 Nissan Versa (CVT). My engine light recently came on, not blinking, but stays lit. I took it to AutoZone to have the code read and is reading P0846, which refers to: Transmission Fluid Pressure Sensor/Switch "B" Circuit Range/Performance I'm not good with cars but I work people who do work on their
cars/trucks all the time, although not familiar with CVT. They tried to check my tranny fluid as a starting point, but couldn't find a dipstick. I know that my Versa requires a special fluid which isn't a problem, but how to you change the fluid with No Dipstick? So really what I need to know is how can I check / change the tranny fluid, and will this solve that problem and get my engine light to go off? Any input is HIGHLY APPRECIATED! I know I could take it to the dealer,
but what like to know how it is done. Thanks Joined Oct 9, 2014 · 3 Posts
Discussion Starter · #2 · Oct 13, 2014 Ok, so two days after this post my car died. I had it towed to the shop. They said the previous code was NOT found, but that the engine misfired, lean fuel and air. Need spark plugs replaced, reset idle air volume, reset codes. Also that brake switch tells my car its consistantly braking...?...? Tranny fluid flush and fill...$1400!!! Yowza... And my car is
only 2.5 years old with 100,000 miles. Joined Nov 14, 2019 · 7 Posts
i ran into the same p0846 code, transmission was slipping rpm would jump back and forth between 3th and 4th. I took it to the dealership and they ended up replacing the valve body which included that fluid pressure sensor(the fluid pressure sensor is inside the valve body) dealership charged $1600 for installing the new valve body plus labor, i only
paid half being that nissan consumer affairs covered 50 percent. i had 112,000 miles when i got that code. OBD-II Trouble Code Technical DescriptionArticle by  Randy Worner ASE Certified Master Technician Transmission Fluid Pressure Sensor / Switch "B" Circuit Range Performance Rationality What does that mean?This generic powertrain/engine diagnostic trouble code typically applies to all OBD-II equipped vehicles including but not limited to Jeep, Dodge, Mazda, Nissan, Honda, GM, etc. The Transmission Fluid Pressure Sensor/Switch (TFPS) is usually found attached to the side of the valve body inside the transmission, although sometimes it may be found screwed into the side of the transmission case/body itself. The TFPS converts the mechanical transmission pressures into an electrical signal for the Powertrain Control Module (PCM) or Transmission Control Module (TCM). Typically, the PCM/TCM will then inform other controllers utilizing the vehicle's data communication bus. The PCM/TCM receives this voltage signal to determine transmission operating pressure or when a shift is occurring. This code is set if this "B" input does not match normal operating voltages stored in the PCM/TCM's memory. It may also be due to internal mechanical issues inside the transmission. Refer to a vehicle specific repair manual to determine which is the "B" circuit for your particular vehicle. P0846 is typically an electrical circuit (TFPS sensor circuit) issue, although as previously stated this code may also be set due to mechanical issues (internal leaks, cracked or missing check balls in the valve body, low system operating pressure/main line pressure, stuck valve in the valve body). This cannot be overlooked in the troubleshooting stage, especially when dealing with an intermittent problem. Troubleshooting steps may vary depending upon manufacturer, type of TFPS sensor and wire colors. Related trans fluid pressure sensor B circuit codes:
Code Severity & SymptomsSeverity depends upon which circuit the failure has occurred in. Since this is an electrical failure, the PCM/TCM can compensate to some degree. The failure may mean that the PCM/TCM modifies the shifting of the transmission if electronically controlled. Symptoms of a P0846 engine code may include:
CausesTypically the causes for this code to set are:
Diagnostic and Repair ProceduresA good starting point is always to check for technical service bulletins (TSB) for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis. A good example of this would be if there are any known power related codes set along with the P0846, or if there is more than one pressure sensor/switch code set. If so, begin your diagnosis with the power related fault code first, or with the multiple code diagnosis first, as this may be the reason for the P0846. Next, locate the Transmission Fluid Pressure Sensor/Switch (TFPS) on your particular vehicle. The TFPS is usually found attached to the side of the valve body inside the transmission, although sometimes it may be found screwed into the side of the transmission case/body itself. Once located, visually inspect the connector and wiring. Look for scraping, rubbing, bare wires, burn spots or melted plastic. Pull the connector apart and carefully inspect the terminals (the metal parts) inside the connector. See if they look burned or have a green tint indicating corrosion, especially if they are attached outside the transmission case. Use electrical contact cleaner and a plastic bristle brush if cleaning of the terminals is needed. Let dry and apply electrical grease where the terminals contact. If you have a scan tool, clear the diagnostic trouble codes from memory, and see if P0846 code returns. If it does not, then the connections were most likely your problem. This is the most common area of concern for this code, as the external transmission connections have the greatest number of issues with corrosion. If the P0846 code does return, we will need to test the TFPS sensor and its associated circuits. With the Key Off, disconnect the electrical connector at the TFPS sensor. Connect a Digital Voltmeter (DVOM) black lead to the ground or low reference terminal at the TFPS sensor wiring harness connector. Connect the red lead of the Digital Voltmeter to the signal terminal at the TFPS sensor wiring harness connector. Turn Key On Engine Off. Check manufacturer's specifications; voltmeter should read either 12 volts or 5 volts. Wiggle the connections to see if they change. If the voltage is incorrect, repair the power or ground wire, or replace the PCM/TCM. If the prior test passed, 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. Check manufacturers specifications on the resistance of the sensor to accurately test the resistance to pressure when there is no pressure applied to it. 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 all prior tests have passed and you continue to get a P0846, this would most likely indicate 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 unsure, seek assistance from a trained automotive diagnostician. PCM/TCMs must be programmed, or calibrated to the vehicle in order to be installed correctly. Related DTC Discussions
Need more help with a p0846 code?If you still need help regarding the P0846 trouble code, please post your question in our FREE car repair forums. NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected. How do I fix code P0846?What Repairs Will Fix P0846?. Change transmission fluid and filter.. Repair leaks.. Repair or replace damaged wiring and connectors.. Replace transmission fluid pressure sensor.. Repair or replace torque converter.. Repair or replace valve body.. Replace transmission pump.. Replace pressure control solenoid.. How much does it cost to fix a transmission fluid pressure sensor?Replacing your transmission oil pressure switch can cost anywhere between $170 and $300, depending on the make and model of your vehicle, the cost of parts and the cost of labor. Mechanic labor prices can vary depending on the auto shop you choose, and the prices of parts will be higher on newer and luxury vehicles.
Is there a recall on the 2012 Nissan Versa transmission?Summary: NISSAN IS RECALLING CERTAIN MODEL YEAR 2012 VERSA VEHICLES EQUIPPED WITH AN AUTOMATIC TRANSMISSION AND MANUFACTURED FROM JUNE 9, 2011, THROUGH JANUARY 13, 2012 FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO.
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2012 nissan versa transmission fluid pressure sensor location
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