Error code

OBD2 P0990

OBD2P0990
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Transmission Fluid Pressure Sensor/Switch 'E' Circuit High.

Severity

moderateCan drive, but shifting issues may occur.

Summary

P0990 indicates that the transmission fluid pressure sensor E (TFP sensor E) is reporting an abnormally high signal to the TCM, which could mean there's a wiring issue or a problem with the sensor itself.

Symptoms

  • Check Engine Light illuminated
  • Harsh transmission shifts
  • Sloppy or late transmission shifts

Common Causes

  • Short to voltage in the signal circuit
  • Open circuit caused by rodent damage
  • Transmission fluid pressure sensor E failure
  • TCM internal failure

Diagnosis

  1. Use a scan tool to monitor TFP sensors while shifting through gears.
  2. Check the signal circuit with a 12V test light when the engine is running and transmission in gear.
  3. Trace wiring from TCM to transmission for breaks, corrosion, or loose connections.

Fixes

  • Repair any issues found in the wiring or replace the faulty TFP sensor E if necessary.

FAQ

What does P0990 mean?

P0990 means that the transmission fluid pressure sensor E is reporting an abnormally high signal to the TCM.

How do I diagnose P0990?

Use a scan tool or 12V test light to check the signal circuit of TFP sensor E while shifting through gears and tracing wiring for issues.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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