OBD-II code P0592 indicates that the powertrain control module (PCM) has detected a low voltage condition in the 'B' input circuit of the cruise control multi-function switch. This typically means there is a short to ground, a faulty switch, or a wiring issue preventing the engine computer from reading the cruise control button inputs correctly.
The multi-function switch on the steering wheel or stalk wears out internally or suffers liquid damage, causing a short to ground.
The wiring between the cruise control switch and the PCM is chafed or damaged, causing the circuit voltage to drop below the expected threshold.
The clock spring assembly in the steering column fails electrically, interrupting or shorting the signal path from the steering wheel buttons to the vehicle harness.
A poor electrical connection at the switch, clock spring, or PCM causes high resistance or an open circuit that mimics a low voltage condition.
The engine computer has an internal fault on the specific input circuit. This is highly uncommon and should only be considered after all wiring and switches are verified.
Yes, the vehicle is safe to drive, but the cruise control system will likely be disabled until the issue is resolved.
In most regions, a cruise control code will not cause an emissions failure, but the illuminated Check Engine Light may automatically fail an OBD-II readiness check depending on local laws.
No, replacing the PCM is rarely the correct fix for this code. Drivers are sometimes told the computer is bad, but the actual cause is almost always a worn-out cruise control switch, a damaged wire in the steering column, or a faulty clock spring.