P0574 indicates that the cruise control module has detected a vehicle speed signal that is higher than the set cruise speed or exceeds an internal threshold. This usually points to a problem with the speed signal feeding the cruise control system rather than an actual over‑speed condition.
The VSS provides the speed input to the cruise control module; a short, open, or noisy signal can cause the module to interpret speed as too high.
A stuck or miswired switch can send erroneous commands that the module interprets as an over‑speed condition.
If the TPS reports an unintended throttle opening, the cruise control may perceive the vehicle as accelerating beyond the set speed.
Some vehicles use wheel speed sensors for cruise control; a faulty sensor can feed an inflated speed value.
Rarely, a corrupted cruise control logic or internal PCM fault can misinterpret valid speed data; this is considered only after other causes are ruled out.
No. PCM/ECM failure is an uncommon cause of this code. Most P0574 cases are due to a faulty speed sensor, cruise control switch, or related wiring. Replace the PCM only after those components have been tested and found good.
Yes. Some vehicles use wheel speed sensors as the speed source for cruise control. A faulty sensor can send an incorrect high speed signal without setting an ABS warning light.
Clearing the code only turns off the Check Engine Light; if the underlying speed signal issue remains, the code will return once the cruise control system runs its self‑test.