P0592 OBD-II Trouble Code: Cruise Control Multi-Function Input "B" Circuit Low

Our certified mechanics come to you · Get a fair and transparent estimate upfront


Cost of diagnosing the P0592 code

P0592 is a diagnostic trouble code (DTC) for "Cruise Control Multi-Function Input "B" Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate* Credit towards follow-up repair Earliest Availability
Ford $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE P0592 DIAGNOSTIC Get a fair and transparent estimate upfront

What the P0592 code means

A P0592 code means that the powertrain control module (PCM) has detected a fault (electrical malfunction) in the cruise control input circuit.

What causes a P0592 code?

In many cases, the P0592 code is caused by a failed cruise control switch. Since the switch is in the vehicle’s interior, it’s not unusual for it to have liquids spilled on it, creating an open or shorted condition.

What are the symptoms of a P592 code?

In most cases, the cruise control system (CCS) won’t work, as the PCM has run self-tests on it and locked out the function. Other symptoms can include an illuminated malfunction indicator lamp (MIL) or possibly limp-in mode.

How does a mechanic diagnose a P0592 code?

Trouble codes are registered when the PCM detects readings from sensors or systems that are outside of norms. In the case of the CCS switch, the PCM is set to see a neutral position when the key is turned on. If it detects anything else, such as no signal or two positions at once, the PCM will read that as an open or short circuit.

A technician will need a digital multimeter (DMM) and model-specific wiring diagram.

  • Check fuses, wiring harnesses and switch terminals. Look for chafing, pinched wires, corrosion or any other obvious damage. Check for bent, broken or backed-out pins on connectors. Repair/replace as needed.

  • Use the DMM to perform resistance and continuity checks. Different CCS systems will use different switch designs, so refer to the wiring diagram and repair manual to determine your vehicle’s switch design and how to perform a check.

  • If continuity and resistance are correct, it could be a PCM fault or intermittent circuit problem.

  • If continuity and resistance are outside of norms, suspect the CCS switch or spiral cable.

  • The cruise control servo which controls throttle settings is dependent on engine vacuum, and uses a signal from the driver to adjust vehicle speed. Check vacuum supply hoses, replace any hoses that are questionable or disconnected.

  • If vacuum lines appear normal, perform vacuum pressure test and compare to manufacturer’s specs.

  • Most systems include a one-way valve, which is easily tested by attempting to blow air through it in both directions. Air should only pass through in one direction. Replace one-way vacuum valve if needed.

  • If vacuum lines and switch continuity/resistance all check OK, suspect the spiral cable. Before checking circuits in the spiral cable, ensure the battery is disconnected, ignition off and all connectors disconnected.

  • If switch continuity or resistance are incorrect, replace the switch.

Common mistakes while diagnosing P0592 code

After replacing any faulty components, be sure to check for blown fuses. Sometimes multiple components are unnecessarily replaced simply because of a blown fuse.

How serious is a P0592 code?

While a vehicle with a P0592 code may still run and drive, it will most likely not have a working cruise control system.

What repairs can fix a P0592 code?

Replacement of cruise control switch or wiring, or repair of vacuum lines to servo at throttle.

Additional comments for consideration for P0592 code

Since the cruise control switch is often located on the steering wheel, it may be necessary to remove the driver’s airbag to access the switch. This can be a dangerous procedure – if you do not have the training and tools, it’s best to leave this to a professional. The airbag’s circuit passes through the spiral cable – do not attempt to circuit-check the spiral cable unless the ignition is off, battery disconnected and all connectors disconnected.

In vehicles that have a multi-function switch at the turn signal stalk, multiple failures may present themselves, including cruise, headlight dimmer, audio controls, wipers, etc. In these instances, the clock spring is often at fault. Do not attempt disassembly of the clock spring unless you are prepared to replace it, as a clock spring is near impossible to repair or reassemble.

Need help with a P0592 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P0592

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0592 code.

SCHEDULE P0592 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


More related articles

P0499 OBD-II Trouble Code: Evaporative Emission System Vent Valve Control Circuit High
P0499 code means the ECM has detected abnormal amounts of pressure in the evaporative emissions system due to clogging or faulty/broken valves.
P0726 OBD-II Trouble Code: Engine Speed Input Circuit Range/Performance
P0726 means the car's computer has received an incorrect engine speed signal often due too a failed, engine input speed sensor or transmission sensor.
P0547 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1
P0547 means that the PCM is reading a malfunction in the exhaust gas temperature sensor circuit due to faulty wiring, sensor issues or exhaust leaks.

Related questions

Truck shutting off when running AC
Knowing what code is being stored and causing the Check Engine Light to come on will greatly help with diagnostics. I would ask for help from one of the mechanics at YourMechanic to come to you with a scan tool,...
The code read P0341, how do I know if it's the chain or the cam sensor?
There is a technical service bulletin for the Acura TSX stating that the code may be caused from the timing chain getting stretched until the tensioner cannot keep it tight any longer. This is a result of not getting oil...
Loud knocking noise and engine is shaking.
Hi there. When passing a vehicle and turning off the overdrive at the same time with the pedal on the floor will be like trying to shift a vehicle without the clutch in a manual transmission driven vehicle. The rpm's...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com