What does it mean when the ABS light comes on with code C1206?

Hey guys, so I’ve been having this issue with my car where I keep getting codes for the LEFT REAR wheel hub, specifically code C1206. I’ve tried changing out the wheel hubs, but no luck, the problem persists. Whenever it rains or snows, the ABS light, traction control, and downhill lights all come on.

This all started after I accidentally hit a curb during winter, and ever since then, I’ve been dealing with these dashboard lights. When I run a scan, it only shows C1206 as the active code.

But here’s the weird part - as soon as the weather clears up, the dash lights disappear. Do you think I might need to replace a cable for the LEFT REAR ABS speed sensor?

Any insights would be greatly appreciated!

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It sounds like you’re on the right track suspecting the left rear ABS speed sensor cable.

Here’s why:

  1. C1206 Code: This code often indicates an issue with the left rear ABS wheel speed sensor circuit.
  2. Matching Symptoms: The ABS, traction control, and downhill lights coming on, along with the C1206 code, point towards an ABS system malfunction.
  3. Weather Dependence: The problem worsening in rain or snow is a classic sign of a faulty connection or damaged wiring, as moisture can cause electrical issues like this.
  4. Hub Replacement Didn’t Fix It: Since replacing the wheel hub assembly didn’t solve the problem, the issue likely lies elsewhere in the system—possibly in the wiring or sensor itself.

Here’s what you can do:

  1. Inspect the Wiring: Carefully examine the wiring harness for the left rear ABS sensor. Look for any signs of damage, corrosion, or fraying wires near the wheel or connection points.
  2. Check the Sensor: While less likely, the sensor itself could be faulty. If the wiring looks good, you might need to replace the sensor.
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The code C1206 typically indicates an issue with the left rear wheel speed sensor, often linked to the ABS (Anti-lock Braking System) or traction control system. Given your description, it seems likely that the sensor or its wiring might have been damaged when you hit the curb. Weather conditions like rain or snow can exacerbate this issue due to moisture affecting the sensor or its connections.

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I once had a similar issue with my car where the ABS and traction control lights would intermittently come on. I initially had no idea what the codes meant and assumed it was a minor issue that would resolve itself. Ignoring it almost cost me dearly when I faced reduced braking efficiency on a wet road. Eventually, I discovered that a damaged wheel speed sensor was the culprit. Replacing the sensor fixed the problem and restored full functionality to the ABS and traction control systems. This experience taught me the importance of understanding diagnostic codes and addressing them promptly to ensure vehicle safety.

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The warning lights on your dash are likely due to a problem with the left rear wheel sensor. You replaced the wheel hub, but the problem might be with the sensor’s wires instead.

The bump from the curb might have damaged the wires that connect the sensor to the car’s electrical system. This damage might only cause problems when it gets wet, like from rain or snow.

Here’s what you can try yourself:

  • Look closely at the wires for the sensor. See if they are cut, scratched, or have any bare wires showing.
  • Check the plug that connects the sensor to the wires. Make sure it’s tight and clean. There are special cleaners you can buy to clean dirty electrical connections.

If the wires look bad or the plug is loose, you might be able to fix the problem by replacing the damaged wires or tightening the plug.

If the wires and plug look okay, it’s also possible that the sensor itself or another car part is broken. If you’re not comfortable working on car electrical systems, it’s best to take your car to a mechanic to get it checked out.