Powertrain, generic · Transmission

P0987 Transmission Fluid Pressure Sensor/Switch E Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

General circuit fault of transmission fluid pressure sensor or switch E. No manufacturer documents this code publicly. The only public user of switch E found, GM's 6T70/6T75 family (Saab 9-4X: switch 5 on the low/reverse and 4-5-6 clutch regulator valve), reports only P0989 and P0990 for it, both as plausibility counts. P0987 is the slot for a module that sees a generic circuit fault on a fifth pressure sensor or switch, for example an open or out-of-range signal, without separating low from high. CARB requires circuit checks on transmission inputs. Range/performance is P0988, low and high are P0989/P0990; switches A to D use P0840 to P0878. Typical effects are frozen shift adaptations and harsher shifts.

Likely causes

Failed pressure sensor or switch E
Open or shorted signal wire or poor connector contact
Faulty input stage in the transmission control module

Symptoms

  • Warning light depending on manufacturer
  • Harsher or less consistent shifts
  • Possible limp mode

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

tfp sensor ewiring harnesstcm

Related codes

P0988P0989P0990P0872P0877P0992

References: law.cornell.edu, saabwisonline.com, sonnax.com.