How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Doug Your Own Question
Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8538
Experience:  Mitsubishi employed and Factory trained ASE certified technician
21364095
Type Your Mitsubishi Question Here...
Doug is online now
A new question is answered every 9 seconds

Is check engine code 1784 fixable

Customer Question

Is check engine code 1784 fixable
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.

Hi,

P1784 is indicating a problem with the low-reverse pressure switch in the transmission.

The most likely cause of this fault is going to be a failure of the solenoid/pressure switch assembly. They are extremely common to fail on these old Chrysler powered Eclipses.
To test it properly you would need a full function scan tool (something with 420A transmission access, not just a code reader) and a transmission line pressure gauge set. If you can get access to those, I am attaching the diagnostic chart below.

Otherwise... most likely the solenoid/pressure switch assembly and you should be OK after that. The line pressure tests etc are still highly recommended in case there is something unusual going on (valve body issue, TCM etc); having it checked properly will avoid any potential unnecessary parts replacements.

Expert:  Doug replied 1 year ago.

Let me know if I can do anything else for you.

Related Mitsubishi Questions