ABS and traction control light on. No codes on Scanner. What could it be?

Hey guys, i need help, ABS light and traction control light are on. Scanned for codes, No codes are present. took MAF sensor off to check if it was the scanner, scanner found the code for MAF sensor. But no codes showed up. I took out a abs sensor, and 4HI started blinking. I put it back in but still the same. I took out the transmission speed sensor and tested with a voltmeter, its fine as well. What could it be?

 

how long have they been on? mine does that after I disconnect the battery and they usually go off after a short drive. have you tried disconnecting the battery to reset it?

 

Yes i disconnected it 3 or 4 times, lights came on Wednesday when i was towing. Checked fuses, those are good. What else could it be?

 

did you check all 4 abs sensors and plugs? they can get damaged pretty easily

 

I dont think its abs sensors bc 4hi wasnt on until i broke the drivers side abs sensor out. I can check for damaged wires.

 

First check your taillights. Make sure you don’t have a burnt bulb.

 

Steering position sensor. If your steering wheel is off to one side or another it will set off the lights. Such as in need of an alignment

 

Would that put a light on the dash but not throw a code?

 

It did for me, but if your steering wheel is straight while driving then that is not your problem.

 

Hmm i mean it seems pretty straight but im not sure. not getting any codes so im not sure what it could be. could towing cause anything?

 

Did you do any work or mods to the truck recently or change anything else?

 

I changed the headlights and did an intake abt a year ago. But no nothing rlly. Just headlights

 

When I was hauling a load of mulch my ABS and traction control sensors alarmed (along with my TSS sensor). Upon doing a little research it was basically because my rear end dropped so much that is threw everything off (my leafs were shot). Once I removed the load and restarted the truck everything went back to normal. I then upgraded my rear suspension to counteract that issue going forward. I know it's not the exact same situation but it certainly could have had something to do with towing causing sag in the rear end causing the sensors to alarm.

 

try reading the abs codes. not all obd2 scanners can get them

https://www.tundras.com/threads/reading-abs-vsc-codes-without-a-scan-tool-2nd-gen-and-more.62732/

 

Oh okay, yeah my dad bought a cheap Chinese scanner, im sure it prolly didnt catch the codes. Ill invest in a real one. and return it after im done with it.

 

I had some warning lights turn on a couple years ago that made no sense (I think it was ABS and 4Hi failure). Dealer tracked it down to a knock sensor wire that rodents had chewed through when they made a home under my intake manifold. Completely unrelated to ABS or anything else. It was a $19 harness and a lot of labor. However, the dealer was able to track down exactly what it was based on the codes they pulled, so as another poster stated, you might want to get a different scanner.