P0988 - OBD Trouble Code

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The OBD-II trouble code P0988 is defined as Transmission Fluid Pressure Sensor/Switch "E" Circuit. In your vehicle the job of the transmission fluid pressure solenoid is to allow the Powertrain Control Module or the PCM or the Transmission Control Module or TCM to use hydraulic fuel in order to engage the clutches in the transmission. This will hence allow smoother shifting between gears while driving. When the PCM or TCM detects a problem with the electrical circuit going to and from this solenoid it will set P0988 code and the check engine light will go on.

It is the responsibility of the TCM or Transmission Control Module to monitor the transmission fluid pressure sensor/switch signal. If the TCM notices that the Transmission Fluid Pressure sensor/switch is not working as per manufacturer's requirements it will set P0988 code.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch "E" Circuit Range/Performance?

• The signal circuit to the TFPS sensor is open
• The signal circuit to the TFPS sensor shows short to voltage
• The signal circuit to the TFPS sensor is short to ground
• The TFPS Sensor has failed
• Issue with the Internal mechanical transmission
• Failure of the PCM

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2. Transmission Fluid Pressure Sensor/switch - Check the switch thoroughly and repair it, or replace it as needed.
3. Mechanical Transmission - Fix the problems with the transmission or replace it as needed.
4. Powertrain Control Module - You can replace your faulty PCM easily with Parts Avatar, our 24/7 online customer service agent will help you with any issues you may have.
5. Malfunction Indicator Light - Check if it is working in order, otherwise repair or replace it.
6. Auto Transmission Connector - Try to fix the problems with the connectors, if they are not able to help clear the trouble code, then you will have to opt for replacement. We offer free shipping on orders over CAD $99. Order now!
7. Transmission Wiring - Repair all the faulty wiring and see if the issue is fixed, otherwise you will have to replace the wires.
8. TFPS Sensor Wiring Harness Connector - Check the connectors properly and try to repair them, if that’s not fixing the P0988 code, then opt for replacement.
9. Digital Voltmeter - Diagnostic tools should be in good working condition to help in diagnosis. Buy from Parts Avatar and resolve the OBD code.
10. Automatic Transmission Control Module - If repairs aren’t helping resolve P0988 code, then you will have to opt for replacement. Parts Avatar has varied brands and price point for their customers, find one that’s best compatible with your vehicle and order from the comfort of your home!
11. Transmission Fluid - You can pick up Transmission fluid from Parts Avatar warehouses directly.
12. Transmission Pan - Clean the pan and see if the P0988 code clears, otherwise replace it with us. Simply order online and have it delivered to your doorstep in just few days.
13. Transmission Clutch - Repair or replace as needed to get rid of P0988 code.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0988 here:

Common Symptoms

• Check Engine Light is On
• Quality of the shift changes
• Vehicle enters limp mode (starts off in 2nd or 3rd gear)

Want to correct the Trouble Code P0988? Read these points mentioned below:

• Repair or replace the damaged wiring of the transmission
• Repair or replace the TCM
• Repair or replace PCM
• Repair or replace damaged connectors of the transmission

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0988 code to be stored:

Start off by checking your technical service bulletins or TSB of your vehicle, they will provide you with information that will help you throughout the diagnosis procedure. You have multiple codes set, in such a case start off with diagnosing the power related fault code first and all the other codes as they may result in the P0988 code setting.

Now, locate the Transmission fluid Pressure Sensor/Switch (TFPS), it is usually attached to the side of the valve body inside the transmission, you may also find it screwed into the side of the transmission case/body itself depending on your vehicle. Visually inspect the connectors and wiring once you have successfully located the transmission fluid pressure sensor/switch. Look carefully for any damages, like scrabing, rubbing, bare wires or burn spots, you may also find melted plastic. Pull all the connectors apart and inspect the terminals inside it, note if they are burned or have green tint on them. This will be indicative of corrosion, especially if they are attached outside the case of the transmission. Using electrical contact cleaner along with a plastic bristle brush and clean the terminals if needed, make sure they are completely dry before applying electrical grease where the terminals come in contact. It’s time to clear the diagnostic codes to see if the P0988 code returns. If it doesn’t then it was definitely the connections that were the problem.

If the code has returned it is time to test the TFPS sensor andthe circuits associated with it. Turn off the key and disconnect the electrical connector at the TFPS sensor, now connect the digital volt ohmmeter or DVOM black lead to the ground or the low reference terminal at the TFPS wiring harness connector. The red lead of the DVOM has to be connected to the signal terminal at the TFPS sensor wiring harness connector. Now, turn on the key and off the engine, refer manufacturers specifications, the reading should be 12 or 5 volts. Wiggle the connections and see if there’s any change, if the voltage is not as the manufacturers prescribed range then you will have to repair the power or ground wire. You may have to replace the PCM/TCM as well if needed. If the previous test was passed, then connect one lead of the DVOM to the signal terminal present at the TFPS sensor and the other to the ground/low reference terminal at the sensor. Refer the manufacturer's specification on the resistance of the sensor, and test the resistance pressure when there’s no pressure applied to it, you will have to wiggle the connector at the TFPS while monitoring the resistance. If you have found that the readings aren’t as needed then replace the TFPS. If all the tests have passed till now but the code is still setting, then the issue most likely is with a failed TFPS sensor. You may want to also rule out a malfunction of the PCM/TCM as well as the internal transmission, but this can only happen once the TFPS sensor has been replaced. Seek assistance from a trained automotive diagnostician if needed just to be sure. The PCM/TCM will have to be programmed or calibrated to your vehicle for it to be installed and work correctly.

Common Mistakes When Diagnosing the P0988 Code

• Failed Transmission Control Module (TCM)
• Low levels of the Transmission fluid
• Malfunction of the Transmission fluid pressure sensor
• Problems with wiring