Abs,brake and service brake light come on at speed sometimes on acceleration and it feels like tranny is not engaging and itwill rev high while the speedometer bounces otherwise it runs fine
SOURCE: Speedometer runs erratic and transmissions drops to second gear.
The ECM or TCM may be the culprit, its also possible that a ground wire is no longer grounded or partially grounded giving you the erratic speedometer.
SOURCE: Speedometer/odometer/cruise control isn't working.
It's your speed sensor at the transfercase on the drivers side i believe. Check the wire and clip to the sensor for any break or loose contacts.
Easy fix and is about a 30 min job to do with simple tools.
Un-clip the wire conntection, remove the retainer bolt and slide and sensor out. To install just do everything in reverse and add transmisson oil if needed.
Most of the time, it's going to be the sensor. Keep in mind that there are two sensor's so make sure it's the one on the output shaft at the transfercase. The other one is closer to the front of the transmission on the same side with is the input Volosity speed sensor.
If it was your ABS sensor, you ABS light would come on in your dash.
Good luck and hope this helps
SOURCE: ABS,Brake light "on" and speedometer not working correctly
Rear Sensor replacement 44.95 retail
Shop Labor 60.00
This will fix the ABS and Brake lights, will fix the speedometer isue and smooth out the erratic shifting.
SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4
One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.
SOURCE: ABS light & brake light on, problems with speedo working properly
The rear wheel speed sensor is the most common problem on those trucks and will do what you are talking about. It is located at the top of the rear axle in the center. It picks up it's signal from a tone ring on the diff inside! If a tranny input or output sensor is bad then the tranny won't shift properly!
213 views
Usually answered in minutes!
×