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2012 Kia Optima EX 2.0T
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Discussion Starter · #1 ·
Hi, new here and hope someone can help. I just bought this unit and the ABS and ESC are on. I scanned and found the RF ABS sensor had no signal, so found a broken wire and fixed, I thought. There is still no wheel speed shown and the same code. I put in a new sensor on the RF, nothing. Checked continuity at the ESC to the sensor (pins 34/21) , and it shows a circuit, the same as the functioning LF sensor. I checked the continuity from the ESC to the PCM (pins 28/78), and good. I cannot see where there is any wire issue, but still have the code C1209. I also have the P2159 but after the RF speed sensor is off, it should clear I believe. I am suspect of the ABS module although no corrosion is noted. I have one coming to see if that is the issue. I am not sure where to go from here. Anyone? Thanks!
 

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