Fix or replace the brake switch and see if the other code goes away.
A c 0237 is a faulty rear ABS SPEED SENSOR .....the Code C 281 is a faulty BRAKE SWITCH CIRCUIT....Speed sensors can sometimes get out of adjustment or a bad connection which can also trigger the Brake Switch Circuit Code....Inspect all brakes and sensors....Brake fluid level......I can help walk you through troubleshooting the problem......Thanks....
SOURCE: 1989 chevy 1/2 ton.brake lights or emergency
The Blinkers and the Brake Lights are the same bulb. So check the brake light switch. Flashers use a different flasher unit, than the turn signals
SOURCE: How do you remove the front drive shaft in a 1999
Jack up front end, and put on stands. Remove wheel. Remove large nut on end of drive shaft. Remove lower control arm, from wheel hub bearing assm.
Push drive shaft back toward transmission.
Now that drive shaft is free, you must "pop" it out of transmission output.
You can use a pry bar, but be careful not to damage anything.
SOURCE: no brake lights on 1985 chevy silverado 1/2 ton
You will need to replace the Brake Light switch which is located on your Brake Pedal.
SOURCE: no brake lights on 1985 chevy silverado 1/2 ton
Make sure your dash lights are working. If not then the headlight switch needs to be replaced. If this is okay go to the back of the truck under the rear bumper on the driver's side and you should see a plug where the tail light harness plugs into the body wire harness. Check this carefully for corrosion ( green gunk) and broken wires. Over time this plug usually corrodes up and wires rot off. I always cut it out and spliced the wires together with heat shrink tubing and tape.
The light sockets ground to the box behind the lens so make sure the black wire has bare shiny metal to metal contact on both sides of the box. The sockets themselves could also be worn enough so as to not make proper contact. Also check the wire harness at the light for chaffing and bad insulation. If I had a nickel for every time I had to fix this....... I kept a roll of tape in the truck at all times.
If you still have nothing, then you will likely have to follow the body harness back to the fuse block looking for the same thing, chaffing or broken wires. You can remove it by undoing the 5/16 bolt in the center of the block and pulling off the left side. All wires to the back of the truck are on this plug.
If you still have nothing then check under the dash. Trace the wires from the brake light switch to the wires from the blinkers. They both use the same side of the bulb. Dark green and yellow if I remember right.
If you have the floor mounted dimmer switch, check the plug in for it very carefully for corrosion. I'm pretty sure your wires go through it too, not sure why. Hope this helps.
Testimonial: "Well it turned out to be my turn light switch. But all the info i got was a good starting point and was grate info for next time. thanks for the help.Thanks!"
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