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2005 Sierra 5.3 4x4 first gear and rev only

Chris Henderson

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Chris Henderson Enthusiast

Chris Henderson

Posted
Posted

Have abs and brake warning light on constant on dash.  Code said bad rear speed sensor.   Bought one new one, also checked second ones ohms, 1400 ohm's.  Showed to be good.  Found out transfer case has 2 sensors.  What next?

 

davester Senior Enthusiast

davester

Posted
Posted

what problem are you trying to fix?  something to do with only having first gear and reverse, or the abs/brake lights, or something with the transfer case?

Chris Henderson Enthusiast

Chris Henderson

Posted
  • Author
Posted

All symptoms, abs, brake warning light on dash, no upshift out of first, and speedometer failed, happened at same time.  Had friend with scan tool, it shows no current code, but shows a code in history.  Rear speed sensor failure.  Replaced and cleared code,. Code comes back, shows the code in history file again.

 

kstruckcountry Senior Enthusiast

kstruckcountry

Posted
Posted

You need someone with a Snap on or Tech II that knows their stuff to hook up. Wouldn't be surprised if they figure it out in less than an hour.

Sent from my SM-G960U using Tapatalk

davester Senior Enthusiast

davester

Posted
Posted

For the abs/brake lights, it is common for the ground to the abs computer to fail.  It's located on the "wing" off the frame rail, under the driver's door.  There are some wires there bolted to the frame, unbolt them, clean off both the frame and the connectors, bolt them back down and cover them in dielectric grease.

 

As for the codes, if you read through the diagnostic procedure for any given code, they rarely are "For code X, replace sensor Y".  There is a list of things to go through, to figure out what exactly is the problem for a specific code.

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