P0842

Transmission Fluid Pressure Sensor/Switch "A" Circuit Low

DTC P0842, sometimes indicated as P084200 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the causing transmission fluid pressure sensor/switch "a" circuit low.

The transmission fluid pressure sensor/switch "A" circuit low message may be caused by a problem with the transmission fluid pressure sensor/switch, a problem with the wiring or connectors to the sensor/switch, or a problem with the transmission fluid pressure control system.
If the problem is with the transmission fluid pressure sensor/switch, the sensor/switch may need to be replaced.
If the problem is with the wiring or connectors to the sensor/switch, the wiring or connectors may need to be repaired or replaced.
If the problem is with the transmission fluid pressure control system, the control system may need to be diagnosed and repaired.

  • P0842: Transmission Fluid Pressure Sensor/Switch A Circuit Low
  • P0842: Transmission Fluid Pressure Sensor/Switch "A" Circuit Low
  • P0842: Trans Fluid Press Sensor/Switch A Circuit Low
  • P0842: Transmission fluid pressure (TFP) sensor A – low input
  • P0842: Transmission fluid pressure (TFP) switch A – low input
  • P0842 00: Transmission fluid pressure (TFP) sensor A - low input
  • P0842 00: Transmission fluid pressure (TFP) switch A - low input

DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • 05-002-23 - POWER TRAIN
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738).
  • 16-128-20R - POWER TRAIN
    SUBARU: This bulletin announces availability of a new transmission harness for use when diagnosis of dtc P0842 -transmission fluid pressure sensor / switch a??Aa?? Circuit low determines the sensor itself is ok but the transmission wiring harness i
  • 0500215 - LANE DEPARTURE
    MAZDA: Check engine light and a/t warning light on with one or more of these dts (P0842, P0847, P0872, P0877, P0780, P1738) stored in tcm memory
  • 05-001-21-3826 - POWER TRAIN
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - oil pressure switch no. 1 (oil press
  • SSM 50116 - EQUIPMENT
    FORD: Some 2020-2021 escape vehicles may exhibit a loss of voltage reference (vref) or runs rough, blow fuse 44 and may or may not set dtc's P06A7,P0840,P0842,P0845,P0847,P2122,P2127,P0522,P008A,P06A6,P2196,P0192, P0212,P0340,P0344,P0365,P0532,p0
  • 16-128-20R - ELECTRICAL SYSTEM
    SUBARU: This bulletin announces availability of a new transmission harness for use when diagnosis of dtc P0842 -transmission fluid pressure sensor / switch ⿿a⿝ circuit low determines the sensor itself is ok but the transmission wiring harness i
  • 16-128-20R - ELECTRICAL SYSTEM
    SUBARU: This bulletin announces availability of a new transmission harness for use when diagnosis of dtc P0842 determines the sensor itself is ok but the transmission wiring harness is ng.
  • 05-003-20-3725 - ENGINE (PWS)
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738). This is caused by the oil pressure switch a and
  • 16-128-20 - ELECTRICAL SYSTEM
    SUBARU: This bulletin announces availability of a new transmission harness for use when diagnosis of dtc P0842 - transmission fluid pressure sensor/ switch "a" circuit low.
  • 16-122-19 - POWER TRAIN
    SUBARU: This service information bulletin provides an updated procedure to follow when diagnosing / repairing a dtc P0842: ?Transmission fluid pressure sensor/switch ?A? Circuit low?.
  • 05-004-19-3466 - POWER TRAIN
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - oil pressure switch no. 1 (oil pres
  • 05-004-18-3466 - ENGINE AND ENGINE COOLING
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - oil pressure switch no. 1 (oil press
  • 05-002-15-3019F - POWER TRAIN:AUTOMATIC TRANSMISSION
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738). P0842:00 - oil pressure switch no. 1 (oil pre
  • 05-002-15-3019E - ELECTRICAL SYSTEM
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-002-15-3019D - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-002-15-3019C - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-002-15-3019 - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-002-15-3019A - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-002-15-3019B - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780). P0842:00 - oil pressure switch no. 1 (oil pressure s
  • 05-005-14-2902B - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with dtc P0842, P0847, P0872 and/or P0877 stored in the tcm memory.P0842:00 - oil pressure switch no. 1 (oil pressure switch b) stuck onP0847:00
  • 05-005-14-2902C - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with dtc P0842, P0847, P0872 and/or P0877 stored in the tcm memory.P0842:00 - oil pressure switch no. 1 (oil pressure switch b) stuck onP0847:00
  • 05-005-14-2902D - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with dtc P0842, P0847, P0872 and/or P0877 stored in the tcm memory.P0842:00 - oil pressure switch no. 1 (oil pressure switch b) stuck onP0847:00
  • 05-005-14-2902 - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with dtc P0842, P0847, P0872 and/or P0877 stored in the tcm memory. P0842:00 - oil pressure switch no. 1 (oil pressure switch b) stuck on P0847
  • 05-005-14-2902A - EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with dtc P0842, P0847, P0872 and/or P0877 stored in the tcm memory. P0842:00 - oil pressure switch no. 1 (oil pressure switch b) stuck on P0847
  • 05-005-16-3218 - POWER TRAIN:AUTOMATIC TRANSMISSION
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738).P0842:00 - oil pressure switch no. 1 (oil press
  • 05-005-16-3218 - ENGINE (PWS)
    MAZDA: Some vehicles may experience the check engine light and automatic transaxle warning light on with one or more of these dtcs stored in the tcm memory (P0842, P0847, P0872, P0877, P0780, P1738).P0842:00 - oil pressure switch no. 1 (oil press
  • PIP-4327A - POWER TRAIN:AUTOMATIC TRANSMISSION
    CHEVROLET: Saturn/chevrolet/gmc/buick/pontiac: ses light and/or no reverse; a slip/flare or harsh shifts in drive range 3rd and/or 5th gear. Codes P0776 clutch pressure control (pc) solenoid 2 - stuck off and P0842 transmission fluid pressure (tfp)
  • 070730015 - POWER TRAIN:AUTOMATIC TRANSMISSION
    CHEVROLET: 6t70, 6t75, 6l50, 6l80, or 6l90. Automatic transmission - information on transmission fluid pressure (tfp) switch check for false dtc's P0842, P0843, P0872, P0873, P0877, P0878, P0989, or P0990. *kb
Consumer Complaints for this DTC


2008 SATURN OUTLOOK with 125000. miles

Transmission failure due to fractured wave plate 3/5. The 6t70/75 6-speed automatic transmission may experience no reverse and slip/flare/harsh shifts in 3rd and/or 5th gear. Codes P0776 clutch pressure control (pc) solenoid 2 stuck off and P0842 transmission fluid pressure (tfp) switch 1 circuit low voltage may be set. The 35r clutch wave plate may be broken, allowing the piston to overstroke, causing the piston to leak and resulting in loss of apply on vehicles with greater than 25,000 miles. During the repair process it is important to install the wave plate in the proper orientation to prevent the possibility for the failure to re-occur. Install the rounded edge of the new wave plate internal splines facing the 35r piston. Note: the same tsb applies to 2007-2009 gmc acadia, 2007-2009 pontiac g5, 2008-2009 pontiac torrent, 2008-2009 buick enclave, 2008-2009 chevrolet equinox and malibu, and 2009 chevrolet traverse, equipped with the 6t70/75 6-speed automatic transmission (rpo mh2, mh4, mh6 and my9).
POWER TRAIN,


2007 SATURN AURA with 145619. miles

I was stopped one evening on my home from dinner when my car would not shift and had to make arrangements to get car to the dealership for the second costly repair...Then six months later i received a special coverage letter in the mail. I had followed the process through the dealership for reimbursement and never so quickly got turned down due to the mileage at the time of repair. Prior to 2009, this transmission had issues caused by a very weak 3,5,r wave plate, which made this transmission prone to failure in gm products. Updated wave plates were released for many clutches in 6t70. The old design wave plates weren't stress relieved and could break with use. The updated wave plates are available. First course of action was a tsb number: pip-4327a owners of 2007-2009 Saturn Aura and outlook, and 2008-2009 Saturn vue equipped with the 6t70/75 6-speed automatic transmission may experience no reverse and slip/flare/harsh shifts in 3rd and/or 5th gear. Codes P0776 clutch pressure control (pc) solenoid 2 stuck off and P0842 transmission fluid pressure 14404a ? Special coverage adjustment ? Transmission clutch wave plate i am requesting a recall due to having defective parts...Knowingly and waiting until consumers/customers were over the mileage to get out of any type of reimbursement that is due to them. I have never been so disappointed with gm customer service and repeating the same answer back to me every time knowingly that my car repair was due to defective parts....I followed the steps and nothing...As if this is all made up. The incident date above was the replacement of the wave plate, piston and spring, reaction gear etc. I have spoke with [xxx] at gm customer service many times and like i have told her i 'm not going away anytime soon. Sincerely, [xxx] 'information redacted pursuant to the freedom of information act (foia), 5 u.S.C. 552(b)(6).
ENGINE, POWER TRAIN

Previous Code: P0841 | Next Code: P0843