Code 24 Vehicle Speed Sensor
Thread Starter
3rd Gear
Joined: Nov 2019
Posts: 3
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Code 24 Vehicle Speed Sensor
I'm looking for input on an issue that has me stumped. In November I purchased a 1 owner 1992 ZR-1 with 50,000 miles on it. Though the car is in really nice shape and obviously well taken care of, the owner had just passed away so i know little history. I was told the clutch had been replaced in the last 1,000 miles.
I have an intermittent code 24, Vehicle Speed sensor code that sets every time the car is driven. It will come and go, sometimes staying on longer than others. The speedometer seems to read exactly correct and always works, never going to zero etc. The Factory service manual indicates under the conditions I have that it's a short/fault in the wiring circuit/connection or a bad ecm. The wiring all "looks" good as far as I can see/trace it. As the 2 wires curve up around the transmission to the main wiring harness I can't get my hands on them but from a distance I can't observe any problems. I've cleaned the connections multiple times with contact cleaning spray and I first thought this made a difference, but I still get the code. As a last resort, I have even replaced the VSS itself, but no difference. Besides it being something wonky with the ECM, is there something else I'm missing??? Has anyone else encountered this????
I have an intermittent code 24, Vehicle Speed sensor code that sets every time the car is driven. It will come and go, sometimes staying on longer than others. The speedometer seems to read exactly correct and always works, never going to zero etc. The Factory service manual indicates under the conditions I have that it's a short/fault in the wiring circuit/connection or a bad ecm. The wiring all "looks" good as far as I can see/trace it. As the 2 wires curve up around the transmission to the main wiring harness I can't get my hands on them but from a distance I can't observe any problems. I've cleaned the connections multiple times with contact cleaning spray and I first thought this made a difference, but I still get the code. As a last resort, I have even replaced the VSS itself, but no difference. Besides it being something wonky with the ECM, is there something else I'm missing??? Has anyone else encountered this????
Team Owner
Joined: Sep 2003
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Retainer for the 'drive gear' on the transmission out-put shaft has maybe failed and when the trans warms the drive gear slips. Happens quite frequently I believe. Do you know if the rear axle ratio has been changed?
Thread Starter
3rd Gear
Joined: Nov 2019
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No obvious performance issues. Since purchase in November I've replaced the original injectors, coils, plugs and wires. I've also installed the Marc H. chip. Other than this the car runs great. I'm located outside of Charlotte, NC.
Thread Starter
3rd Gear
Joined: Nov 2019
Posts: 3
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I don't know if the rear axle ratio has been changed, but I would guess no. The car seems stock and was a one owner. I took the car out today and it "seemed" that the light mostly stayed off once the car was warmed up. If this retainer failed and the drive gear was slipping wouldn't it effect the reading on the speedometer? The speedometer consistently reads correctly.
