OBD Codes
Your OBD-II Trouble Codes Repair Site

P056A Cruise Control Increase Distance Signal

OBD-II Trouble Code Technical Description

Article by
Patrick Cameron
Patrick Cameron
Red Seal Certified Technician

Cruise Control Increase Distance Signal

What does that mean?

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 P056A, and related codes (P0565, P0566, P0567, P0568, 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 P056A and/or related codes. Most likely, the use of said function will be disabled and/or acting abnormally.

Code P056A is set when the ECM detects a malfunction within the INCREASE DISTANCE signal of the adaptive cruise control (ACC) system.

NOTE: ACC systems are not only intricate in design but also require special tools and/or diagnostic procedures to adequately rectify any fault present.

An example of cruise control buttons on a steering wheel:
P056A cruise control buttons on steering wheel

What is the severity of this DTC?

Severity would be considered moderately low. Even if you lose entire functionality of the cruise control system, you can still get to work safely. As far as further damage if left unattended goes, this would be the rare case in which you may be able to neglect if lets say, your vehicle is old and you can live without cruise, or you cannot afford to fix the vehicle.

That being said, it is possible that neglecting ANY electrical issue long enough may result in further damage.

What are some of the symptoms of the code?

Symptoms of a P056A trouble code may include:

What are some of the common causes of the code?

Causes for this P056A code may include:

What are some P056A troubleshooting steps?

Basic Step #1

First 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 #2

Does 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 #3

To 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 #4

It 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.

Related P056A DTC Discussions

Need more help with a P056A code?

If you still need help regarding the P056A trouble code, please post your question in our FREE car repair forums.

NOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.