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Jan 12, 2026 - 10:21 PM
A C342D code is typically related to the ABS or traction control system, often pointing to an issue with a wheel speed sensor or its circuit. That code is separate from your cylinder 1 misfire and random/multiple misfire (P0301 and P0300), so you're likely dealing with two different problems at the same time, not one issue causing all the codes.
For the misfires, start with the basics on cylinder 1: inspect or replace the spark plug and ignition coil, since coil failures are common and can also trigger a random misfire code. If those check out, look at the fuel injector, vacuum leaks near that cylinder, or low compression. Fixing the misfire should be the priority, as continued driving can damage the catalytic converter.
For the C342D code, inspect the wheel speed sensor and wiring at the affected wheel for damage, corrosion, or debris on the sensor or tone ring. A bad wheel speed signal can cause ABS or traction control lights, but it will not cause an engine misfire. Clear the codes after repairs and see what returns. Tackling each issue separately and starting with the simplest checks will save you time and money.
Hope this helps!
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