What Does P0592 Mean?
The cruise control multi-function input 'B' circuit is reporting a low voltage condition to the PCM. The signal from the cruise control switches is below the minimum expected threshold. This typically means the circuit is shorted to ground, a resistor has failed low, or there is a wiring issue pulling the signal voltage down. The cruise control system will be disabled.
Common Causes
35%
Short to ground in the cruise control signal wire
25%
Failed cruise control switch with internal short to ground
20%
Damaged clockspring with internal short between conductors
12%
Water intrusion or corrosion in the steering column connector creating a ground path
8%
PCM internal pull-up resistor failure
Diagnostic Steps
1
Check the cruise control input 'B' voltage PID — it should read at or near the pull-up reference voltage when no buttons are pressed; a reading near 0V confirms a low circuit condition.
2
Disconnect the cruise control switch connector at the clockspring and recheck the voltage at the PCM — if it rises to normal, the fault is in the switch or clockspring.
3
With the switch disconnected, measure resistance from the signal wire to ground — it should be OL (open); any low resistance reading points to a wiring short.
4
Inspect the clockspring connector (under the steering column cover) for signs of water damage, corrosion, or pinched wires that could short to the metal steering column.
5
If the wiring and switch test good, check for the proper pull-up voltage at the PCM connector pin — absence of pull-up voltage indicates a PCM internal fault.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The cruise control multi-function input 'B' circuit is reporting a low voltage condition to the PCM. The signal from the cruise control switches is below the minimum expected threshold. This typically means the circuit is shorted to ground, a resistor has failed low, or there is a wiring issue pulli...
The most common cause of P0592 (Cruise Control Multi-Function Input "B" Circuit Low) is: Short to ground in the cruise control signal wire
Typical repair costs for P0592 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. Cruise control will be disabled by the PCM. There is no risk to vehicle safety, braking, or drivetrain operation. The driver simply cannot use cruise control until the fault is repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0592 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control / Speed Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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