Drive with caution — fix soon.
This code sets when the 'A' high-resolution timing reference sensor sends an erratic or intermittent signal instead of a steady stream of pulses. It's commonly caused by a loose or corroded connector, chafed wiring, or a sensor that's starting to fail. Because the fault comes and goes, it sometimes takes a careful inspection of wiring and connectors to track down, but it's usually repairable without engine teardown.
$150 – $500
Varies by vehicle and root cause.
Usually yes for short trips, but the intermittent nature means it could stall unexpectedly. Avoid long drives and get it diagnosed soon so you don't get stranded.
Expect around $150 to $500. Wiring and connector repairs are often cheaper, but intermittent faults can take extra diagnostic time, which adds to labor.
It's moderately serious because the on-and-off signal can cause sudden stalling. It rarely damages the engine, but it's worth fixing promptly for safety and reliability.
Because the fault is intermittent, it may not be present when the technician checks. Loose connectors and chafed wires that only act up with heat or vibration are common culprits.