P094 limp mode, no overdrive

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 4 of 4
Northstar Engines and System Technical Discussion Discussion, P094 limp mode, no overdrive in Cadillac Engine Discussion; I have a 1994 Cadillac sts 4.6 Northstar engine with P094 code. I have 1st, 2nd and 3rd gears but ...
  1. #1
    d_pope is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Oct 2007

    ArrowP094 limp mode, no overdrive

    I have a 1994 Cadillac sts 4.6 Northstar engine with P094 code. I have 1st, 2nd and 3rd gears but when it is time to shift into overdrive (45 mph)the car goes into limp mode. I have just replaced the PCM, TPS and the A and B solenoids with filter and bracket.

    I cleared the codes using the climate control and recalibrated the throttle. Have taken the car for a test drive and I still have the same problem. No overdrive at 45. I stopped and turn the car off, Restarted and drove the car back in 3rd. Car shifts 1st, 2nd and 3rd and reaches speed over 45mph.

    The codes that are displayed now are

    P036 = EGR pintle out of range. Current

    S072 = Left Rear accelerator fault. Current

    P094 = shift "A" solenoid problem. History (was current but I restarted the car to get it back home)

    Can the P036 pintle out of range or the S072 rear acelerator cause the transmission / PCM to enter limp mode?

    Has anyone had the same problem after replacing the solenoids and what did you do to resolve it?

    I have seen a few posts about this situation but no final solution.

    Any input would be greatly appreciated.


  2. Remove Advertisements

  3. #2
    d_pope is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Oct 2007
    Thread Starter

    Re: P094 limp mode, no overdrive

    Follow up on this problem 10-7-07.
    On the advice of a fellow caddy owner I have cleaned the EGR valve and removed the intake plenum to clean the passages that lead to the EGR valve. There was a lot of carbon build up in the passages that are under the intake plenum/manifold. The EGR was stuck closed the pintle should move freely and I used a screw driver to push it back from the seat. I then scraped the carbon deposits from the seat area.

    I clearded all codes and test drove the car. On the back roads the transmission shifted 1st , 2nd ,third and fourth. This is the first time in weeks that I have had overdrive! With more driving the car did go into limp mode. Checking codes I now have P094 and S072. The P036 code (EGR pintle out of range) has gone due to the cleaning.

    I feel that the next step is to tackle the S072 code and replace / repair the left rear accelerator. Since the two codes are being triggered at the same time.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: P094 limp mode, no overdrive

    left rear accelerator?

  5. #4
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Fairbanks, Ak

    Re: P094 limp mode, no overdrive

    Quote Originally Posted by Ranger View Post
    left rear accelerator?
    It's right above the dingfod.
    Don't mess with Binky Bear!

  6. Remove Advertisements
    Cadillac Forums

+ Reply to Thread
Gear in this thread - Powered by O'Reilly Auto Parts

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)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


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