P0592
UniversalCruise Control Multi-Function Input B Circuit Low
The vehicle has detected a low electrical signal in the cruise-control multi-function input B circuit. This circuit carries driver control commands to the cruise-control system. Cruise control may be unavailable or work intermittently, though some vehicles may show no obvious symptoms. The code identifies a detected condition; it does not by itself prove that a particular part has failed.
⚠️ Before You Begin (Safety First)
Do not rely on cruise control until the fault is diagnosed. If the vehicle’s speed or throttle response behaves unexpectedly, stop somewhere safe and have it checked before continuing.
Common Symptoms
- Cruise control may not engage because the system cannot reliably read an input from circuit B.
- Cruise-control buttons or functions may work intermittently if the input signal is unstable.
- A warning light or message may appear, depending on the vehicle.
- There may be no noticeable symptoms if the system disables cruise control without affecting normal driving.
Common Causes
- A short to ground or damaged insulation in the input B circuit may pull the signal low.
- A loose, damaged, or corroded connector may interfere with the input signal.
- The cruise-control multi-function switch may have an internal fault affecting circuit B.
- A wiring, ground, or control-module circuit fault may prevent the input from being read correctly.
Diagnostic Steps
- Check the owner’s manual for the cruise-control warning or message and note when the problem occurs.
- With the vehicle parked safely and the ignition off, visually inspect accessible cruise-control switch and wiring connectors for looseness, corrosion, or damage. Do not pull on wiring or disassemble components unnecessarily.
- Check whether other steering-wheel or cruise-control buttons also behave inconsistently; this can help identify whether the issue affects more than one input.
- Have the code and related codes read with a suitable scan tool. Avoid replacing parts based on this code alone.
- If the fault remains, use vehicle-specific service information or consult a technician for circuit testing.
When to Call a Professional
A technician can check for related codes, review cruise-control input data, inspect the input B wiring and connections, and test the switch and control circuit using vehicle-specific service information. Confirm the wiring condition before replacing a switch or module.
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Commonly Asked Questions
Does P0592 prove the cruise-control switch is faulty?
No. The code reports a low signal in the multi-function input B circuit. Wiring, connectors, grounds, the switch, or the control circuit may need to be checked before identifying the cause.
Can I drive with P0592?
The code commonly affects cruise-control operation rather than basic vehicle control. Do not use cruise control until it is checked, and stop safely if speed or throttle response is abnormal.
What does “circuit low” mean?
It means the vehicle detected a signal level lower than expected for that circuit. The exact signal behavior and diagnostic procedure depend on the vehicle.
Could P0592 appear without noticeable symptoms?
Yes. The vehicle may simply disable cruise control or store the code without an obvious change in normal driving.
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