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Brake warning light flashing

Tiny
STOCK0823
  • MEMBER
  • 1990 GMC VAN
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
Brake light in dash flashes a code 6, which according to chart, is a bad speed sensor. My van is a g3500, 350 v8, 400 turbo transmission. I do not know where speed sensor is located. Can you help?
Sunday, October 21st, 2018 AT 6:33 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,289 POSTS
Hi and thanks for using 2CarPros. Com.

The code indicates an erratic signal in the speed signal. It could be a bad sensor, partially disconnected sensor, or damaged wiring/connector/corrosion. I attached two pictures for you. The first one indicates the location of the sensor (left side of transmission). The second is a diagnostic flow chart.

Let me know if you have other questions or need additional information. Also, ignore picture 2. For some reason I cannot delete it.

Take care,
Joe
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Sunday, October 21st, 2018 AT 7:29 PM
Tiny
STOCK0823
  • MEMBER
  • 1 POST
Thanks a lot. I now know location of sensor. I will check it out Tuesday. Again, thank you very much and I will use 2carpros again.
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Tuesday, October 23rd, 2018 AT 10:14 AM

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