Join Date: May 2014
Location: San Andreas Fault Zone
Mentioned: 124 Post(s)
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Re: C1401/C1402 Traction Control Valve RF Circuit
The OBDII description you found for C1402 is somewhat misleading ... a more informative for this code is "Malfunction in Front Speed Sensor LH Circuit".
Look for damaged cable to the left-front wheel speed sensor, corroded or contaminated contacts in the connectors, a loose sensor mounting bolt, metallic contamination on the end of the sensor, or less likely, a failing wheel bearing.
Damaged cables can be hard to detect, as the conductors inside the cable can be broken even though the outer insulation is intact. Inspect the cable carefully for any evidence that something hit it, pinched it, or got caught on it.
Pull the sensor itself, and verify that the plastic housing is not cracked, and that the tip is clean and there is no ferrous debris on it. When reinstalling it, verify that the mounting pad is clean and the sensor is seated properly.