2002 DeVille - Rough Idle - Throwing Codes

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 2 of 2
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2002 DeVille - Rough Idle - Throwing Codes in Past Cadillac Vehicle Discussion; I've got a 2002 Caddy DeVille with 152k on it. "Service Engine Soon" light came on today, along with a ...
  1. #1
    shanenc14 is offline Cadillac Owners Member
    Automobile(s): 2002 Cadillac Deville
    Join Date
    Jun 2012

    2002 DeVille - Rough Idle - Throwing Codes

    I've got a 2002 Caddy DeVille with 152k on it. "Service Engine Soon" light came on today, along with a rough "jumpy" feeling when idling; so I decided to run the OBD...Got tons of codes
    Could someone please help me define these codes. I looked up the OBD codes online, but I'm not mechanically inclined, some I understand, some I don't.

    • C1214: System Relay Contact or Coil Circuit Open
    • C1248: EBCM (Electronic Brake Control Module) Turned Red Brake Warning Indicator Light On. - This was confirmed by my local Caddy dealer some time ago...
    • U1016: Loss of Class 2 Communications with VCM
    • B1327: Device Power Circuit Low
    • B0429: Temperature Control #3 Rear Circuit Range/Performance - Assuming this has something to do w/ rear A/C and Heat controls?
    • B1004: Keep Alive Memory (KAM)
    • B3177: Window Down Switch Circuit Low
    • B3282: Window Switch-Express Input Shorted to Ground
    • C0658: Level Control Compressor Circuit High
    • P0174: Fuel Trim System Lean - Bank #2

    After clearing all codes, the "Service Engine Soon" light went off...Hope I'm not looking at any major punches to the checkbook... any help/elaboration on the meaning of the codes I've got is greatly appreciated.

  2. Remove Advertisements

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 2002 DeVille - Rough Idle - Throwing Codes

    The only code that could/would affect idle quality is the P 0174 - Bank 2 (left)(front) fuel/air mixture. Check all the intake air ducting at/after the MAF. About the only fault that would directly affect bank 2 only would be a leaking intake manifold port seal (there are 8 of them). A large air intake or connector plenum leak usually sets BOTH bank codes - P 0171 and P 0174.

    Whenever you "pull codes", note whether each is Current or History - it makes a difference, as in: whether the fault is recurring or is/was a transient hiccup.

    B 0429 is the diverter door to the rear seat climate control console. If the console fan works and it blows air, forget it.

    The window codes MAY be in the driver's door control panel/wiring/harness.

    Level control - that compressor/shock bladder system that compensates for extra weight in the trunk or rear seat.

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts