Chevy GMC speed sensor wiring. Erratic speedometer, transmission shifting. ABS light.

erratic speedo / speedometer
transmission shifting issues
service brake system soon on dashboard
ABS light Check engine light
instrument cluster
code P0502
speed sensor wiring
transfer case speed sensor
check this first
Chevy GMC
Silverado Sierra Yukon Tahoe Avalanche Escalade
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
1999 to present
6.0 liter 5.3 liter
hope this helps someone

[@williammurray8060]

Got a 93 s-10 2wd 2.5 auto. Doing same thing. Going to replace outgoing speed sensor.

[@killingtime11111116]

For me it’s like if I keep the rpms low before it like shifts it Dosent jolt as bad but if I try to drive normals it jolts hard I can’t figure it out, I get no codes and it’s only that first gear , I’ve checked my fluid seems to be fine can someone help me , 2005 gmc cannon

[@kevinherrera9580]

Does it have to have the purple cap on it? Because when i unplugged mine it didnt have it on... and i have that p0502 code...

[@fixthis4333]

Yes, the factory wire has a purple cap on the male end.

[@kevinherrera9580]

Thanks

[@andrewrichards5523]

Hey man, I just replaced my transmission, now throws p0502 is the plug that’s furthest back on the t case near the rear drive shaft (passenger side) the one that gives speed signal. And can I run new wires directly from the sensor straight to the computer under the hood where they go into? Thanks

[@fixthis4333]

Drivers side transfer case speed sensor controls the speedometer. Green and purple wires. They have stripes on them but can't remember what they look like off the top of my head. You should be able to run new wires all the way to the PCM they are the same colour at the harness.

[@andrewrichards5523]

@@fixthis4333 okay awsome thankyou, I alawys thought it was the one furthest back. It’s like impossible to find a year accurate diagram for it, I ordered a new plug, do you know what guage the wire is ?

[@fixthis4333]

@@andrewrichards5523 I want to say 14 gauge.
Send me an email address I'll send you a diagram for the transfer case

[@cameronezeff7100]

@@fixthis4333 which wire is positive and negative?

[@ryanr6160]

@@fixthis4333could I get that diagram too!?? Having the same problem

[@kennethfrancis6209]

HELP 2006 CHEVY 2500HD 4X4 6.0 ENGINE... doin the same shit hard shift from 1 to 2.. and no speedo had the cluster rebuilt n everything... replacing all sensors currently at shop for diagnostic... but you cant trust a mfr to give you the correct answers

[@fixthis4333]

If it's not the speed sensor itself could be wires. Follow them there is a connector harness beside the transmission check that too. That's a start.

[@fixthis4333]

9

[@fixthis4333]

If they don't fix it let me know I'll see if I can send you a wiring diagram

[@kennethfrancis6209]

Fixed with the harness wires being replaced, now abs and parking light come on some times for 60 seconds but brakes are fine and the speedometer bounces at 65 and 70 mph when the abs lights are on only

[@ThatOneGuyTyler]

Toner ring problems

[@KamelAbiHassan]

Part number please!!

[@chrisjohnson-ml4hs]

Whats was the oms for it

[@fixthis4333]

Can't remember

[@jayneteets7068]

9oii99 LP