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 vipertech Your Own Question
vipertech, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1854
Experience:  Jeep factory certified technican
Type Your Jeep Question Here...
vipertech is online now
A new question is answered every 9 seconds

2002 Jeep Liberty: P1686 and P1698 codes

Resolved Question:

I have a 2002 Jeep Liberty and am getting P1686 and P1698 codes. What does this mean?
Submitted: 7 years ago.
Category: Jeep
Expert:  vipertech replied 7 years ago.

Good evening, the code P1686 is no SKIM BUS message recieved. The means that there was no message recieved from the special gray key security module in simple terms.


P1698 is no BUS message from the trans controller.


Both of these codes require some detailed checking and diagnosis. Depending on if both of these codes are active.....and not stored, then the codes may be related. There is no one common cause for these codes. You will need to have access to a scanner that can access both the trans controller as well as the SKM module. If you have the correct scanner than let me know and I will give you the detailed flow charts to check the codes.


The possible cause could be wiring or a possible defective control module.


If this answers your question than please press "ACCEPT". If you need more help then please let me know. Thanks

Customer: replied 7 years ago.

Im guessing both of these codes are active. The codes were cleared and they came right back. I have a scanner that does check the trans control as well as the SKM module.


When you say the "grey Key", I assume that you are referring to the grey ignition key. If so, we tried the spare key and it did not have any affect on the check engine light. The light still remained illuminated.


When I cleared the codes again and immediately rescanned, I then got a P0740, TCC circuit Malfunction. Does this help diagnose the issue?

Expert:  vipertech replied 7 years ago.

Yes, I am speaking of the special Grey key. The key wont be the issue, the lack of communication between control modules will be. Being that they did come back then the codes are active. At this point you will need to run the test for the codes that you found. Here are the flow charts:








As mentioned, there is no common cause for these codes so you will need to run the tests.



vipertech, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1854
Experience: Jeep factory certified technican
vipertech and 3 other Jeep Specialists are ready to help you

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

  • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
< Previous | Next >
  • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
  • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY

Meet The Experts:

  • Chris


    Shop Foreman

    Satisfied Customers:

    Jeep Certified Master Tech
< Last | Next >
  • Chris's Avatar


    Shop Foreman

    Satisfied Customers:

    Jeep Certified Master Tech
  • Mark's Avatar


    22 Year Factory trained technician

    Satisfied Customers:

    Jeep factory training........25 years in the industry.
  • Dave's Avatar


    Jeep Master Tech

    Satisfied Customers:

    Chrysler Triple Master, ASE master Tech AA degree in Auto.
  • moparfl's Avatar


    ASE Certified Technician

    Satisfied Customers:

    ASE Master Tech Chrysler Dodge Jeep Master Tech
  • Tim Mohr's Avatar

    Tim Mohr


    Satisfied Customers:

  • Ron Z.'s Avatar

    Ron Z.

    - Jeep Tech -

    Satisfied Customers:

    18+yrs experience. State Inspector & Jeep Diagnostics/Repair
  • jeepmopar76's Avatar


    Jeep/Chrysler Triple Master Tech

    Satisfied Customers:

    32yr ASE Master Tech, 9yr Chrysler Master Tech, 19 yr Jeep Dealership service including AMC/Eagle