Speedometer fluctuates to maximum and back to zero with complete power loss (but lights still work) while in motion and sometimes stopped; at times indicator jumps back and forth only slightly while key is turned on or engine still running. Have replaced speed sensor and cleaned ground. The problem is very erratic and comes with no notice at any tiem. No solution yet
2007-04-08 06:10:21 · 3 answers · asked by jibal 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
For those who are mechanics be advised that I have replaced the Speed Indicator Sensor (mounts on the transmission housing). This make does not have a "speedometer cable" as on older cars.
2007-04-08 07:36:05 · update #1
Sounds to me that you are experiencing a board problem inside the PCM. Have you scanned for codes and data? At times these PCMs will freeze which is an indication that it is humped. With the motor running tap the case of the PCM and see if the motor runs funny or stalls. If the board is faulty it will stall or stumble on a regular basis. Does your coolant fan come on for no reason also? This is also an indication that the PCM has had it. This was a very common problem for this year and type of car and PCM. The PCM is located above the glove box. Remove the glove box and look up. You can leave it in place while running the motor and whack it to see what happens. Good luck.
2007-04-08 06:26:56 · answer #1 · answered by Deano 7 · 0⤊ 0⤋
i own a repair shop and this car don't have a cable on it it has a speed sensor,it mounts on the rear or side section of the transmission,replace it its going bad and that's whats causing the problems with it,once it is replaced you may have to have it scanned to see if it has any other problems with it also,but for now replace the speed sensor,that should help it a lot,good luck hope this helps.
2007-04-08 07:03:00 · answer #2 · answered by dodge man 7 · 0⤊ 0⤋
could be speedometer cable in the transmission
2007-04-08 06:16:26 · answer #3 · answered by Anonymous · 0⤊ 0⤋