Drivable short-term, but fix now to avoid damage.
This code means the engine computer detected an electrical fault in the circuit for ignition coil J, the coil responsible for sparking one of the cylinders. It typically results from a failing coil, broken or shorted wiring, or a bad connector. It's a common code and is usually resolved by replacing the faulty coil and repairing any related wiring problems.
$100 – $350
Varies by vehicle and root cause.
Usually for short distances, but don't depend on it. A misfiring cylinder can overheat and damage your catalytic converter, which costs a lot more than a coil. If the engine shakes hard or the light is flashing, stop and get the car towed.
Most repairs fall between $100 and $350. A single ignition coil is inexpensive and labor is generally fast. The total can climb if wiring or connectors are damaged or if multiple coils are replaced at the same time.
Yes, it deserves prompt attention. One misfiring cylinder won't leave you stranded right away, but ignoring it can harm emissions components and worsen engine performance. Treat it as a repair to make soon.
Ignition coils each work independently, so one can wear out or short while the others stay fine. Heat, age, and oil or moisture intrusion often cause a single coil like J to fail before the rest of the set.