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Cadillac engine repair questions and answers

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  • 00437731cs
    00437731cs - 2002 Cadillac Escalade - Engine - 6/11/2013
    What does the code P1518 mean?
    I drove through a puddle of water and the car cut off,after a while and several trys it started up and the engine light came on and it started driving sluggish like it was going to cut off .
    • Jimm
      6/11/2013 Jimm
      P1518 = Throttle Actuator Control Module Performance
      Possible causes:
      - Dead or weak battery
      - Poor circuit connection - Check Throttle Actuator Control (TAC) module connector for water
      - Faulty Throttle Actuator Control (TAC) module

      When is the code detected?

      The Engine Control Module (ECM) has detected a loss of data or invalid data from the Throttle Actuator Control (TAC)

      - Engine Light ON (or Service Engine Soon Warning Light)
      - No throttle response

      P1518 CADILLAC Description
      The Throttle Actuator Control (TAC) module contains data which is essential for proper TAC operation. The TAC module continuously test the integrity of this data. When the TAC module is unable to write or read data to and from random access memory (RAM), or the TAC module is unable to correctly read data from the flash memory or and internal TAC module processor fault is detected and the Detected Trouble Code (DTC) is set.

      There are several Cadillac Technical Service Bulletins (TSB) for the P1518 code - check the AutoMD website for the TSB details.
      6/12/2013 00437731cs
      Thanks I put some Lucas fuel injector cleaner in my gas tank and drove around and let the car sit for a few hours when i started it again the light had gone out.
  • kellyjames502
    kellyjames502 - 1992 Cadillac DeVille - Engine - 6/9/2013
    What will cause my air-conditioning compressor clutch not to engage?
    160,000 miles When I press auto button on ac control it wont stay on and goes to econ.
    • Jimm
      6/9/2013 Jimm
      The a/c compressor will engage when; the a/c system is filled with refrigerant, the compressor fuse, relays, wiring / connections and switch / controls are working correctly. If the a/c system is fully charged, then check these other items in the system - starting with the switch, the wiring / connections and fuses to the compressor.
  • thomas.r.orlik
    thomas.r.orlik - 2012 Cadillac CTS - Engine - 6/3/2013
    • Jimm
      6/3/2013 Jimm
      Check the TSB details at these websites;,, -among others.

      Since there may be the technical service bulletin and your vehicle is MY 2012 - what does the dealership suggest they might do about this issue on your vehicle? By the way, the correct TSB designation is: PIP4523A

      Here is information and a website ( on what GM is claiming as 'normal' noise for the supercharger....WOW!!

      The torsional isolator is used in the CTSv LSA engine to isolate potential gear rattle noise during idle. The isolator contains a torsional spring that fits over the shaft. Purpose of the shaft is to distribute the stresses in the torsional spring. As the spring goes thru its travel, the inside of the coils can contact the shaft. The spring material is intentionally harder than the shaft which by design results in visual witness marks and/or limited wear on the shaft. The witness marks and/or limited wear is expected and has been observed on all the Eaton component durability tests, GM engine and vehicle durability tests and on customer vehicles with no impact on the functionality of the spring and isolator. The shaft and isolator are in a sealed cavity, separate from the rest of the supercharger and engine.

      Q: Will this shaft wear harm my engine?

      A: No. The visible wear will not damage the engine. The supercharger and the engine were tested and successfully validated to meet all GM durability requirements…which are much more severe than any customer usage.

      Q: What causes this wear?

      A: The isolator contains a torsional spring that fits over the shaft. The purpose of the shaft is to better distribute the stresses in the torsional spring and prolong its life. As the spring goes thru its travel, the inside of the coils can contact the shaft. The spring is a harder material than the shaft…so that when there is contact, the spring will not potentially break. If the spring breaks, then the torsional isolator function is lost.
  • tgarry5270
    0 answer
  • robg4678
    robg4678 - 1996 Cadillac Seville - Engine - 6/2/2013
    Where can I find the ant theft control unit for my 1996 cadilac seville
    I've replaced the key, tumbler for the key had programmed. replaced starter and every relay on the car. replaced every electronic device on the car except the anti theft module which I cannot find I've checked the doors behind and under all seats....The car will not ...
    • HouseCallAuto
      6/2/2013 HouseCallAuto
      I have worked on GM anti-theft systems for many years in all different body styles and never had to ever replace an anti-theft module. That being said I believe that you may have something else going on here.In more than 90% of all cases relating to a no crank situation in the PassKey system, the cause is at least one wire being broken at the ignition lock cylinder which you said you replaced already? Your first sentence is not clear to me. **I've replaced the key, tumbler for the key had programmed.** Does this sentence say you replaced the ignition lock cylinder?
  • jkcaddy
    jkcaddy - 1996 Cadillac Eldorado - Engine - 5/25/2013
    A/c works fine in my area then when I drive to a hotter area it stops working New compressor put in 2 years ago
    It blows warm air when it's really hot outside and works fine in milder climates
    0 answer
  • gail.ross
    gail.ross - 2000 Cadillac Escalade - Engine - 5/24/2013
    Distributor cap was cracked. Rained and car wouldnt start. Put new spark plugs in. Tried starting twice. Took to shop. N
    real slow pick up/take off.
    0 answer
  • joe
    joe - 1987 Cadillac Brougham - Engine - 5/21/2013
    Fuse box diagram for 87 Cadillac brougham
    could anyone tell me where I can find a diagram to tell me which fuses are which for a 87 Cadillac brougham, thanks Joe
    • Jimm
      5/21/2013 Jimm
      Try these websites;,, or for the fuse box diagram.
  • joe
    joe - 1987 Cadillac Brougham - Engine - 5/20/2013
    Gas gauge not working
    can someone tell me where the fuse is located for gas gauge, fuse box isn't marked, I have a book and the troubleshooting part says if warning lights are not working either it's probably the fuse, the only idiot light that comes on is the battery. I checked all ...
    0 answer
  • tonyo49er
    tonyo49er - 1995 Cadillac Seville - Engine - 5/19/2013
    While driving on freeway at 65 mph, it seemed as if the transmission came out of high gear. the car drives at 40 mph,
    but won't go into higher gear. the service engine soon came on and stayed on until i turned the car off. it then ran fine, but today it's doing the same. the car was just tuned up a month ago and runs perfectly. pls advise.... thx
    0 answer
  • kalmasi80
    kalmasi80 - 1999 Cadillac Catera - Engine - 5/17/2013
    Why does my car, all of a sudden, have trouble accelerating?
    A few weeks ago I had a LOT of work done on my car. I got a new(er) engine, new motor mounts, a new radiator, new heater core, and new tie rods and sleeve. The car itself has almost 89k miles on it but the new engine only has about 35k miles. A few days ago I was ...
    • frankiedonnn
      5/17/2013 frankiedonnn
      It seems to me you should go back to the garage where the work was performed,surely there is some waranty on the job.Or you could get a scan for free at Advance Auto and see if there are any codes to enlighten as to what could be going on with it.
    CHUCK - 2006 Cadillac DTS - Engine - 5/11/2013
    No cold air coming from ac
    high mileage,compressor is engaged. the readings on low side are approx. 145 psi. and approx.45 psi. on acceleration the low side moves a little, but nothing on the high side. this is the first problem ive encountered with this ac system. sounds like either a bad ...
    0 answer
  • poindexter1832
    poindexter1832 - 2003 Cadillac CTS - Engine - 5/5/2013
    If the comp cam brakes will that lock up a motor
    • Jimm
      12/14/2012 Jimm
      Need more information - what is meant by 'comp cam'?
      12/15/2012 poindexter1832
      the mechanic said there were broken parts inside the motor, and he don,t know were they came from. and he said something about cam shaft may have broke.the car had oil in it and the pump was working.
    • Jimm
      12/17/2012 Jimm
      OK - if the camshaft is broken, then Yes that will lock the motor from turning / operating. Your choices are limited to; replace or rebuild the existing engine if it's even rebuildable (depending upon the damage), or exchange the engine for a rebuild.

      Try the many on-line auto parts sources; such as -, or for the replacement parts. The replacement rebuilt engine lists for around $1800.00 or more - for the long block (minus accessories and labor to install).
      12/26/2012 poindexter1832
      i have insurance.but i have one more question. i had a used thottle body put on this year,i don,t know if the tech put on a new gasket or not can that lock the motor.?
    • michaelrickey
      5/5/2013 michaelrickey
      No not in any way shape or form!
  • Schwabyjc
    Schwabyjc - 2007 Cadillac Escalade - Engine - 5/5/2013
    Dealer says 'oil filter housing' is cracked and needs to b placed.what is the oil filter housing?
    Occasional oil drip on garage floor
    • michaelrickey
      5/5/2013 michaelrickey
      This is a cast standoff like piece where the oil filter spins on.
  • plipkin3
    plipkin3 - 2001 Cadillac DeVille - Engine - 5/5/2013
    Fuel date center display starts flashing between functions after driving for a while (gets hot?)
    Have replace control, no effect. Change oil light also starts flashing.
    • frankiedonnn
      5/5/2013 frankiedonnn
      Changing the oil and filter is definitely a good idea if it has'nt already been changed recently.But look for low coolant level and visible leaks from radiator and connecting hoses,water-pump weep- hole.Check for worn drive-belts.If the water-pump drive-belt is slipping ,it would overheat.If it's a pre owned car one does'nt know if the belts have ever be replaced,so i would replace them unless they look really new.Also I would flush the cooling system and replace the coolant because coolant loses it's effectiveness after a year or two.A lot of little things together can cause an engine to overheat.But it is important to consider big problems too like coolant in the engine oil or oil in the coolant which you will notice when checking coolant and oil levels.I hope it is something small.
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