I OWN A 2001 PONTIAC GRAND AM 2.4 LITER 4CYL. AUTOMATIC. IT HAS 177,000 MILES RIGHT NOW I HAVE NO SERVICE LIGHTS ON BUT WHEN I START THE CAR STILL NO SERVICE LIGHTS UNTIL I PUT THE CAR IN REVERSE OR DRIVE THEN THE SERVICE VEHICLE SOON LIGHT "SVS" LIGHT COMES ON. IF I TURN THE CAR OFF AND START IT BACK UP THE "SVS" LIGHT IS GONE UNTIL I SHIFT INTO GEAR AGAIN THEN IT WILL COME BACK ON. THIS IS A INTERMITTENT PROBLEM DOES NOT HAPPEN ALL THE TIME.
THIS LIGHT WILL STAY ON UNTIL I TURN THE CAR OFF DOES ANY ONE KNOW WHAT WILL CAUSE THIS? COULD MY TRANSMISSION LEVEL BE LOW, A SENSOR BE BAD ANY IDEAS??? HELP PLEASE. THANK YOU.
Answer: This warning light on your Pontiac is not related to the transmission fluid level. The service vehicle light is usually related to an ABS brake or Traction Control system problem. You would need to have the computer scanned for trouble codes.
When you put the car in gear, the computer starts to look at wheel speed sensor data. If it does not see that from one of the sensor, it will turn on this warning. Each wheel has a speed sensor. Another possibility is that a wiring may be rubbing. When you shift into gear, the engine and trans move. This can pull on a wiring harness and cause a problem. Either way, a code stored in the computer will give an indication as to what part of the system is having a problem.