P0566 Cruise Control Off Signal Malfunction

Description and meaning of DTC p0566

This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles equipped with cruise control. That may include but is not limited to vehicles from Peugeot, Ford, Nissan, Chevrolet, Hyundai, VW, Audi, Citroen, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration. Within the vehicle option cruise control, there are many functions. Not only can the operator set a specific vehicle speed, and it be maintained automatically using numerous sensors, switches, modules, among many other components, but you can also modify the speed electronically (i. e. set - resume +), temporarily modify speed while storing previous speed (i. e. passing vehicles, unexpected stopping/slowing), among other things. Given the fact that most of the functions mentioned in the description of P0566, and related codes (P0565, P0567, P0568, P0569, P0570, etc. ), are contained within one switch/component, it should be fairly painless to locate the mechanical inputs (i. e. buttons, switches, talks, etc. ) involved. That being said, some of the common names for said component(s) are: Multi-function switch, Steering wheel controls, Cruise control switch, Cruise control module, Accessory switch, etc. What happened, in this code's case, is the ECM (Engine Control Module) has detected a malfunction(s) within the signal circuit. Simply put, something went wrong within the circuit of the function mentioned in the description. When the ECM detects a signal malfunction within one or more of the many cruise control functions, it illuminates the CEL (Check engine light) with P0566 and/or related codes. Most likely, the use of said function will be disabled and/or acting abnormally. Code P0566 is set when the ECM detects a signal malfunction within the OFF signal of the On/Off circuit.

p0566 diagnostic trouble code symptoms

Symptoms of a P0566 trouble code may include:Cruise control light in dash not coming on or constantCruise control inoperativeCannot set cruise control to desired speed or speed is erraticCertain function(s), within the cruise control system, non-operative (i. e. Resume, Set, +, -, Coast, Accel)Commands not functioning consistently

DTC p0566 - possible causes

Causes for this P0566 code may include:Cruise control switch, or buttons within the switch, defective and/or damagedConnector(s) not making proper and effective electrical connectionWire(s) within the cruise control harness chafed and/or damaged causing short, open, resistance, etc. Cruise control switch assembly contaminated with fluid (i. e. coffee, soda, juice, etc. )ECM issueCruise control module defectiveBCM (Body Control Module) issueOverheated parts causing malfunction

How to fix OBD-II diagnostic trouble code p0566

Basic Step #1First thing I would do here, is visually inspect the cruise control switch/module. Sometimes, buttons are missing, cola has stuck the button in one position, buttons are loose and not making proper electrical connections. That all said, make sure that the buttons, that control the cruise functions, are freely moving and not contaminated with potentially damaging particles and/or dirt. You will also want to record ALL of the cruise functions' malfunctions or abnormalities. Basic Step #2Does the cruise control light come on in the instrument cluster when cruise is manually activated? If not, you may want to verify if there is a fuse for the circuit. This information should be found in the make and model's service manual. Replace any blown fuses with new and manufacturer-approved ones. Basic Step #3To access the harness to the cruise control switch/module, generally speaking, you will need to remove some dash parts (i. e. steering column shroud, airbag module in steering wheel, etc. ). To pinpoint the specific wire involved in the fault, you will definitely be needing a proper wiring harness for your vehicle. These vary significantly, given many reasons. Always acquire proper service information BEFORE executing anything too invasive. Basic Step #4It is a good idea to make sure your ABS (anti-lock brakes) system is in good working order and no ABS light on in the dash. ABS uses numerous sensors including speed sensors that, if malfunctioning, could fool the computers into thinking the vehicle is going faster or slower than the actual speed.

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