P0592 code meaning
Cruise Control Multi-Function Input B Circuit Low
What P0592 means
Cruise control buttons form a resistor ladder on one or two signal lines, each button giving its own voltage window. FCA uses two lines with offset windows – signal 1 is input A, signal 2 input B – and both must report the same button; GM evaluates the ratio to the reference. Any fault locks out cruise control; CARB treats this as emission-neutral, and GM and Ford set these codes without warning lamp. P0592 means signal line B is too low: GM (engine variant LGW) at a ratio of 0–0.185 for over 2 s, a short to ground or open circuit; FCA treats signal 2 below 0.784 V as circuit low.
P0592 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0592
- Cruise control and distance or mode buttons inoperative
- Cruise control locked out
- No check engine light
Common causes of P0592
- Most likelyLine B shorted to ground (steering wheel, clockspring)
- PossibleButton block faulty or damp
- PossibleCorroded connector
- Less likelyModule
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cruise control switchClockspringSwitch wiringBody control module
What each part of P0592 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 92 | The exact fault in that area. |
What to do next
- Note P0592 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0592
What does P0592 mean?
P0592 means "Cruise Control Multi-Function Input B Circuit Low". Cruise control buttons form a resistor ladder on one or two signal lines, each button giving its own voltage window. It is a generic code, so it means the same on every make.
Is it safe to drive with P0592?
P0592 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0592 fail an emissions test?
P0592 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0592 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P0592 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.