Powertrain, generic · Transmission

P084A Transmission Fluid Pressure Sensor/Switch H Circuit

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. Mitsubishi uses P084A as a function check of the primary pulley pressure sensor: the module compares primary with secondary pressure and sets the code after 5 s outside the map at a steady ratio of 0.5 to 1.0. Electrical faults of both sensors come first as P0842/P0843/P0847/P0848; belt slip and wear debris in the fluid often follow, cured with a valve body or belt and pulley set.

Likely causes

Valve body with faulty primary or secondary pressure sensor
CVT belt or pulleys damaged, slip and debris in the fluid
Harness or connector
Control module software or module

Symptoms

  • Warning lamp on
  • Judder or slipping when pulling away
  • CVT limp mode with limited ratio

Repair estimate

DifficultyHardWorkshop job
Parts and labour€800–5,000
Time3–12 h

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

Parts involved

transmission fluid pressure sensortransmission valve bodytransmission wiringtransmission control modulecvt belt

Related codes

P0841P0842P0843P0847P0848P0776

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