c0210 RR Wheel Sensor, with ABS, Brake & Slip Indicator lights - Fixed, bad rear wheel bearing

Driving back home a week or so ago (2010 DCLB, Auto, 125K miles) and all of a sudden the speedo did a weird fluctuation from 25 to 0 up to 30 and back to 25. Then the Slip Indicator and ABS lit up. A few yards later the Brake light comes on....WTF?!?! Did all the immediate checks (fuses, fluid, check connectors) and did the search here but no luck. When I jumpered the pins in the OBD port the codes I had are 31, 32, 33 and 46 (which is a generic VSC error code I believe).

Fallon Toyota read the code c0210 and they wanted close to $400 to replace it, NO NO NO NO Tacoma World will fix this. Deeper searches lead me to this thread, which had a wealth of information, thanks @WebberLander :

https://www.tacomaworld.com/threads/abs-brake-traction-control-lights-on.494620/

Sadly I've got good voltages everywhere. I picked up a replacement sensor, cleared the lights and they came right back on. When I pulled the RR Wheel Sensor to replace it, it was completely glopped up in what looked like Molybdenum grease (black graphite shit). Should have taken a picture, duh. I don't have any signs of a leaking axle seal which makes me think I have a bad wheel bearing and the "grease" is the bearing going and that's what is blocking the signal from the ABS Speed Sensor.

Everything works fine, no problem with 4WD and I've done the Green Wire Mod so when I throw the switch the fourth light VSC OFF (below the Slip Ind) comes on, and goes back off when the switch is thrown back. Any input?

EDIT: The cause was a bad rear wheel bearing.

 

Tried calibrating the VSC? https://www.tacomaworld.com/threads...ibrate-your-vsc-computer-the-easy-way.467485/

 

Yes, should have included that but thanks.

 

Are you auto or manual?

 

Auto, I'll update the OP, thanks.

 

Very odd. Logic points to it being an abs sensor, because you're getting codes for it and that's what controls the speedometer. But you're saying you're getting good voltages. Was this tested at all 4 corners?

 

Also do you mean parking brake indicator lit up?

 

There's a few possibilities, the bearing is the magnetic tone ring on these trucks, and the ring can swell from oil contamination over time.

What I do on really hard to diag trucks is disconnect the sensors, flip them left to right and see if the code moves. (they wont bolt in, they just sit)

Next I will read output on the scan tool, you will have to rely on voltages from each rear output.

Nearly everytime I get an ABS code on a Taco or Tundra I go after the rear ABS harness, I inspect it carefully for green corrosion.

 

Only had time to check the RR. I'll hit the others tomorrow.

Yes, PB Indicator, same indications as the referenced thread.

 

My money is on the other sides sensor being messed up since you already replaced the RR, or maybe a corroded connection or something. I'd very thoroughly inspect the abs wires from above the axle down to the wheels.

Oddly enough, I had something sorta similar happen while wheeling one time. Was trying to climb a snowy hill and just started spinning, not going anywhere. My ABS and parking brake lit up (no VSC for me and speed is measured at driveshaft in a manual). Turned truck off and on and they persisted. 30 minutes later it self corrected and hasn't come back and to this day I have no freaking clue why it happened.

That's not helpful at all, but I wanted to share.

 

I'll ring out the whole rear cable tomorrow and check the other side. Frustrating because it came out of nowhere. Thanks for the input. I'll keep the thread updated with end results.

 

you can easily check for ABS codes or clear the ABS light yourself by using a jumper wire and reading the blinking ABS light on the dash..








I had a problem with the left rear sensor that was intermittent. Because that ABS light was not always on it took sometime to diagnose and fix. Found a frayed wire in a connector.

The damaged wire:


Disassembling the connector:


Made new Bosch style connectors. Spliced, soldered and heatshrinked to the damaged section:



All buttoned up and reinforced to reduce any additional vibrations:

 

Thanks. When I did jumper the pins and read the codes I had 31, 32, 33 and 46 (which is a generic VSC error code I believe). But the dealer rang it out to be c0210 RR.

Is it normal for the sensor to be packed in grease?

 

I had exactly what you are talking about. New rear axle bearing and it all went away.

 

Thanks Tom, that's the only thing I could boil it down to. There's no way the signal can get to the sensor through all the grease in there. Did you go ahead and do both or the one side?

 

I just went out and checked all four corners and I'm reading between 10.88-10.95 so that's all good. I think @Airdog nailed it.

 

If you hit up @05Taco4x4 he can make rear bearing assemblies I’m fairly certain. He’s made them before.

 

Yeah, he does do the rears. I just did both my fronts using his, he does real nice work and has an incredibly quick turnaround. My problem is that I don't have the time to the rears right now. Unfortunately I think I'm going to be at the mercy of the stealership...