Powertrain, generic · Transmission

P084B Transmission Fluid Pressure Sensor/Switch H Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Transmission fluid pressure sensor/switch H is the last of up to eight pressure inputs (A to H) in SAE J2012; the letter is the maker's choice. Documented uses are rare: Mitsubishi sets P084A on its Jatco CVT8 (F1CJC/W1CJC) and Ford P084B on the 2020–23 Explorer 3.3 full hybrid. P084B means the signal is valid but implausible. Ford bulletin 24-2019 covers the Explorer hybrid with its 10-speed: the code sets with the MIL or wrench lamp because software thresholds were too tight, and a PCM reflash fixes it, after which the shift adaptation relearns. Which measuring point Ford calls H is not stated. Otherwise the usual causes apply: sticking valve, drifting sensor, low fluid.

Likely causes

Control module software with too tight thresholds
Dirty or worn valve body, sticking valve
Pressure sensor or switch drifting
Fluid level low or fluid aged

Symptoms

  • MIL or wrench lamp on
  • Shift quality changes until the adaptation has relearned
  • Limp mode with substitute gear or limited ratio

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time0.5–8 h

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

Parts involved

transmission fluid pressure sensortransmission valve bodytransmission wiringtransmission control module

Related codes

P084AP084CP084DP083BP0841

References: static.nhtsa.gov, law.cornell.edu.