P0989: Transmission Fluid Pressure Sensor/Switch “E” Circuit Low OBD-II Trouble Code

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.

Symptoms

Symptoms of a P0989 include:

  • Harsh shifting
  • Transmission will not go into gear
  • Limp Mode

Causes

  • Dirty transmission fluid
  • Low transmission fluid level
  • Damaged wiring
  • Corroded/broken connectors
  • Transmission fluid pressure sensor/transmission line pressure sensor has failed
  • Valve body issues

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?

  • Add or change transmission fluid and filter
  • Repair or replace damaged wiring and connectors
  • Replace transmission fluid pressure sensor/switch
  • Repair or install remanufactured valve body

Related Codes

  • P0987 – Transmission Fluid Pressure Sensor/Switch “E” Circuit
  • P0988 – Transmission Fluid Pressure Sensor/Switch “E” Circuit Range/Performance
  • P0990 – Transmission Fluid Pressure Sensor/Switch “E” Circuit High.
  • P0991 – Transmission Fluid Pressure Sensor/Switch “E” Circuit Intermittent