Question about 1996 Cadillac DeVille

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Transmission sensor flashes a "service transmission" warning occasionally. Engine/transmission behaves normally. What's the purpose of the sensor? Can continued driving without replacement be detrimental?

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Most cadillacs have service intervals programmed into the information display module. It can't hurt to have it serviced... anyone with the proper ifnfo can reset the warning interval

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

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I have a 2004 Mazda 3. The car started revving on its own even while driving. Now the engine light and AT light is on. What does this mean?


This is not an uncommon problem on the Mazda 3 autos of various years and it is an automatic transmission related problem even though the check engine light comes on when the AT light displays.. The AT light is a warning that there is an issue with the auto transmission.

You will probably also find the auto transmission is not changing as it should or not going onto particular gears and the increases in engine RPM when driving is caused by a problem with the transmission.

The cause is primarily neglected maintenance of the transmission by owners .

If you stop the car and restart it you might find the warnings go away and the car starts behaving normally for a very short time. The problems will definitely come back and both warnings lights will come back and the auto trans will start playing up again.

If you do not address the problem the computer system could send the vehicle into limp mode or stop it altogether as a preventative measure to save the transmission from damage. You need to take the car to Mazda service and have them check it over with their diagnostic equipment. They have seen all this before with the transmissions in other Mazda 3s/. For this issue I would strongly recommend you don't take the car to some independent unless the business is a very competent specialist in Mazda vehicles.

Jan 17, 2016 | Mazda Cars & Trucks

1 Answer

Automatic gearbox


IT IS GOING INTO LIMP MODE. COULD BE A TRANSMISSION ERROR. THE LIMP MODE IS DESIGNED TO PROTECT TRANS AND ENGINE FROM FURTHER DAMAGE

Oct 16, 2013 | Mercedes-Benz Cars & Trucks

1 Answer

Laguna mk2 1.9 diesel suffers occasional loss of power


with diesels there is an injector control module that sometimes causes problems
possible bad harness connections , ground wires so for starters I would be looking in that area after I ran a fault code check
anything that pits on an engine light and restricts rpm should leave a code

Nov 26, 2017 | 2000 Renault Laguna Estate

1 Answer

1996 dodge caravan 2.4 liter 4 cylinders .Engine service light comes on for a period of 2 to 3 months then goes off .Prior to this the engine light stayed on continuously ,until the oxygen sensor connected...


There is some sort of diagnostic code stored in either the ECM(engine computer) or TCM(transmission computer).There are many sensors and solenoids and other data parameters that can cause a codes to set other than just the oxygen sensors.You will need to have the code(s) pulled to know where to start.

May 07, 2011 | 1996 Dodge Caravan

2 Answers

My car will occasionally shift hard. after parked for about 30 minutes it won't do it again for a couple of days.


Have your transmission serviced and pressure test the transmission line. It sounds like the EPC (electronic Pressure Control) valve is starting to fail. Once the EPC valve fails, the transmission will default to the highest pressure and hard parts will eventually break. Easy fix in pan. Fix as soon as possible.

If your lucky it's going to be your TPS, Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace. TPS (Throttle Position Sensor)

Thank you for using fixya and good luck.

Dec 06, 2010 | 2002 Chevrolet Monte Carlo

1 Answer

The mileage sensor is out on my 99 expedition, were can i locate it to get it to work?


I have a 1999 Ford Expedition with a 5.4L Engine and don't know what you are talking about. I searched under mileage sensor for the 99 expedition but could only find On-Board Warning Systems.

Are you talking about the Vehicle Speed Sensor?

If so, this is located near or on the transmission and has wires that go into the harness, and basically is a pickup coil that detects movement of the transmission which then controls mileage on the odometer and the speedometer.


prev.gif next.gif On-Board Warning Systems Turn on the ignition switch in almost any vehicle and watch the instrument panel. The modern automobile has an abundance of warning lights that provide valuable information. The list could include:
  • Brake system warning
  • Windshield washer fluid level
  • Coolant level
  • Brake fluid level
  • Door ajar
  • Headlamp door position
  • EGR or Check Engine
  • High beam indicator
  • Seatbelt light
  • Cold engine warning
  • Turn signals
  • Charging system
  • Transmission temperature
  • ABS or Anti-lock Brake System
  • SRS or Supplemental Restraint System
  • Brake lining wear indicator light. The high price of fuel created a demand for yet another light--the fuel economy warning system. When the light comes on, it tells the driver he or she is pushing too hard on the gas pedal. High manifold vacuum equals good gas mileage and vice versa. The system simply reads manifold vacuum from a sensor, and when it drops to a predetermined level, a circuit is completed and the light is lit. This has become in many models what is known as the up-shift light. An arrow on the dash indicates the time to shift into the next gear to obtain optimum fuel economy. If a warning light comes on, you must find out why. It means there is a problem either in the system being monitored or in the warning lamp circuit. Finding the actual fault is important and not very difficult. However, a wiring diagram may be needed to prevent confusion. Looking at the typical warning light circuit, you'll see that the bulb is most often supplied with current through the ignition switch. Further examination reveals the most common way of completing the circuit and getting the bulb to light is by means of a sensor, which completes the ground connection. In this case, sensor is a fancy word for a switch that turns on or off according to specific conditions. Consider a typical oil pressure warning light system. Current from the ignition switch flows through the warning lamp and from there to ground through the oil pressure switch. This particular switch is normally closed and the circuit is complete until the switch opens in response to oil pressure in the engine. Just the opposite is true with the coolant temperature sensor. It is normally open and only completes the circuit when an internal element expands (in response to heat) to close the contacts. If the vehicle has a cold engine warning lamp, the sensor includes two sets of contacts. One set is normally closed and opens as the internal element expands. This action breaks the ground circuit to the warning lamp. The other set of contacts functions if the temperature rises far enough to close them, turning on the high temperature warning. If either of the temperature lights is lit while the engine seems normal, just unplugging the wires from the sensor will provide valuable diagnostic information. If the lights remain lit, there's a short to ground in the wiring from the lamp to the sensor. The service needed isn't to the cooling system, but to the warning system. If the lights go out with the wires unplugged and the engine seems normal, it's entirely possible that the sensor has failed and needs to be replaced. Nevertheless, don't just unplug the wires and forget about them. This could be disastrous for the vehicle owner should a cooling problem develop without warning. Fig. 1: Typical coolant temperature sending unit location 84926079.gif
    Fig. 2: Oil pressure sending units may be located in a variety of places on the engine 84926080.gif

  • Jul 06, 2010 | 1998 Ford Expedition

    1 Answer

    I have a 2001 hyundai elantra with automatic transmission. The transmission drops gears with no warning, gets stuck in lower gears....I have had the input and output sensors replaced....things go OK for a...


    Hi there, I live in Colombia South America and I have a HYUNDAI Elantra 2001 automatic transmission and it behaves exactly like yours. I have the best mechanic guy intown and also the dealer garage take down the whole transmission and nothing changed. It seems now to be something with the electric wiring system.

    I would recommend you to have the electric system checked.

    Good luck.

    May 14, 2010 | 2001 Hyundai Elantra

    1 Answer

    My 2000 Nissan Sentra GXE has 143 k miles. Recently, I have noticed it occasionally revs up (engine gets louder) and it has a difficult time changing gears. This is an automatic. When I first start the...


    If the transmission OD (overdrive) light is on or flashing, it means the transmission controller has diagnosed an internal transmission fault. To diagnose the problem, a scan tool that can read transmission codes must be plugged into the vehicle diagnostic connector (usually located under the dash near the steering column). The scan tool will then display the transmission code(s) that turned the warning light on. What happens next depends on the code. If the code indicates an internal performance problem, the transmission will probably need the attention of a specialist. But if the code indicates an electrical fault, a bad sensor or solenoid, you may be able to fix the problem without having to take your vehicle to a transmission shop. Hope this helps.

    Aug 17, 2009 | Nissan Sentra Cars & Trucks

    1 Answer

    1999 Mercedes Benz ML 430 periodically stalls at idle


    Hi, Joe here The problem sounds like a faulty crankshaft position sensor. The sensor is located on the transmission bell housing on the left side. Can be accessed threw the top of the engine near the firewall.

    Mar 25, 2009 | 1999 Mercedes-Benz M-Class

    1 Answer

    Need to know what the warning light on dash means


    The flashing dash light is a warning about a failing system, most likely the fuel system. On mine it was the oxygen sensor on the way out. You need to do the diagnosis process with the ECU and this will report back the code that will tell you precisely what's the problem. You'll find the ECU diagnosis procedure here at the 300ZX online factory service manual.
    Hope this helps.

    Oct 08, 2008 | 1990 Nissan 300ZX

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