The P0989: Transmission Fluid Pressure Sensor/Switch ‘E’ Circuit Low refers to an issue where the transmission fluid pressure sensor/switch ‘E’ is receiving lower than expected voltage. This can prevent the sensor from functioning properly, leading to inaccurate fluid pressure readings and transmission performance issues.
P0989 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0989: Transmission Fluid Pressure Sensor/Switch ‘E’ Circuit Low |
| Is it serious? | Yes, as low voltage can cause improper transmission fluid pressure regulation, affecting shifting and transmission performance. |
| Possible causes | – Low voltage in the transmission fluid pressure sensor/switch ‘E’ circuit – Faulty transmission fluid pressure sensor/switch ‘E’ – Wiring or connector issues |
| How to diagnose? | – Check the circuit for low voltage – Inspect wiring and connectors – Replace the transmission fluid pressure sensor/switch ‘E’ if necessary |
P0989 Meaning
The P0989: Transmission Fluid Pressure Sensor/Switch ‘E’ Circuit Low code indicates that the voltage in the transmission fluid pressure sensor/switch ‘E’ circuit is lower than required. This can cause the sensor to provide inaccurate pressure readings, leading to poor transmission performance, including delayed shifting or slippage.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional fault codes that may provide further context on the low voltage issue. | OBD-II Scanner |
| Test for Low Voltage | Use a multimeter to check the voltage in the transmission fluid pressure sensor/switch ‘E’ circuit. Compare the voltage readings with manufacturer specifications to ensure they are not too low. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for signs of damage, corrosion, or loose connections that may be causing low voltage in the sensor circuit. | Flashlight, Multimeter |
| Test the Sensor | Use a diagnostic tool to test the transmission fluid pressure sensor/switch ‘E’. Replace it if it is malfunctioning or receiving low voltage. | Diagnostic Tool, Replacement Sensor |
| Clear the Code and Test Drive | After making repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the system to ensure the P0989 code does not return after the test drive. | OBD-II Scanner |
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