The Lemon IndexA transmission fluid pressure switch has an electrical fault.
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
Failed pressure switch. Then: wiring fault.
Owners named P0840 in 5 complaints to the U.S. government, most often on the Nissan Murano.
Cars owners report it on
Complaints that name P0840, by model. Raw counts, not a failure rate: popular models get more complaints.
Transmission problems by year: Nissan Murano
The details
What P0840 means
A transmission fluid pressure switch has an electrical fault.
Can I drive with P0840?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
Common causes of P0840
- Failed pressure switch
- Wiring fault
A shop should confirm the cause with a scan and tests before replacing parts.
Related codes
P0841 P0843 P0845 P0846 P0850 P0826 P0867 P0868
Quick answers
What does P0840 mean?
Transmission Fluid Pressure Sensor/Switch A Circuit. A transmission fluid pressure switch has an electrical fault.
Can I drive with P0840?
Fix soon. Book a shop visit this week. Stop driving if the car slips, shakes, overheats or warns you.
What causes P0840?
Failed pressure switch; Wiring fault.
Counts: NHTSA owner complaints whose text names P0840. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.