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CarParts.com will be back soon!We apologize for the inconvenience. The CP Team is working on some upgrades to improve our service. Thank you for using CarParts.com! You can call us at 1-866-529-0412 Reference ID: 18.6ef06e68.1667536737.c680e36 The ECU has to know how much hydraulic pressure is available, in order for it to decide on the best shift strategy. If there is a problem with the transmission fluid pressure sensor E circuit, then a P0989 DTC will be saved. Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model. What Transmission Do I Have?How Serious is the Code?The P0989 diagnostic trouble code is extremely serious, and may result in a number of transmission problems like unusually abrupt shifts and limp mode. SymptomsSymptoms of a P0989 include:
Causes
How to Diagnose the Code?When trying to diagnose a P0989 OBDII trouble code, it’s important to start by checking the level and condition of transmission fluid. Since low levels and dirt/sludge can reduce the overall transmission line pressure, dirty transmission fluid should be changed immediately. If that isn’t a problem, then the wiring and connectors along the transmission wiring harness will have to be closely inspected to see if there are any damage wires or corroded/broken connectors. If that isn’t an issue, then the TFPS switch will have the be tested. If it works properly, then there may be a mechanical problem that is triggering this OBD2 code (like valve body problems). Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model. What Transmission Do I Have?What Repairs Will Fix P0989?
Related Codes
OBD-II Trouble Code Technical DescriptionArticle by Randy Worner ASE Certified Master Technician Transmission Fluid Pressure Sensor / Switch "E" Circuit Low What does that mean?This generic powertrain/engine diagnostic trouble code typically applies to all OBD-II equipped vehicles including but not limited to Chevrolet, Acura, Honda, Saturn, Jeep, Toyota, 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 "E" 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 "E" circuit for your particular vehicle. P0989 is typically an electrical circuit (TFPS sensor circuit) issue. 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 "E" 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 P0989 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. 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 P0989 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 P0989 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 P0989, 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 p0989 code?If you still need help regarding the P0989 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 you fix low transmission fluid pressure?What Repairs Will Fix P0868?. Change the transmission fluid and filter.. Repair transmission fluid leaks.. Repair or replace damaged wiring and sensors on the transmission wiring harness.. Replace the transmission pump.. Replace transmission fluid pressure sensor.. Replace transmission fluid temperature sensor.. How do I fix code P0989?What repairs can fix the P0989 code?. Replacement of electronic pressure control solenoids.. Replacement of transmission fluid control sensor.. Addition or replacement of transmission fluid.. Hydraulic blockage removal.. Replacement of electrical components.. In rare cases, replacement of the PCM or the transmission control module.. How do I fix code P0843?What repairs can fix the P0843 code?. The most common repairs for a P0843 are as follows:. Replacing the transmission fluid pressure sensor.. Replacing the transmission fluid pressure control solenoid.. Replacing and flushing the transmission fluid.. Repairing damaged or blocked fluid hoses.. What causes transmission fluid pressure low?Low fluid levels caused by fluid leaks. Dirty or contaminated transmission fluid. Defective transmission fluid temperature sensor. Pressure pump failure.
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