P0576 Cruise Control Input Circuit Low Trouble Code

P0576 Cruise Control Input Circuit Low

OBD-II Trouble Code Technical Description

Cruise Control Input Circuit Low

What does that mean?

This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles equipped with cruise control. Vehicle makes may include but aren't limited to Chevrolet (Chevy), Toyota, Ford, Harley, Dodge, Ram, Ford, etc.

 

The ECM (Engine control module) spends most of it's time making sure your engine is working as it should all while keeping emissions, fuel economy, performance, noises, creator comfort functions at acceptable levels. Cruise control is a great feature for long trips given the fact that you do not need to control the speed of the vehicle. The ECM can take care of this as long as the cruise control system is free of any defects. If you are reading this, more than likely your cruise control has stopped working. A good sign that the cruise control has been completely disabled by the ECM is, the cruise control light on the dash doesn't come on when you try to activate it.

Generally speaking, this trouble code means that the control input has suffered an electrical malfunction that stems from numerous potential causes. The P0576 Cruise Control Input Circuit Low and related codes (P0575 and P0577) are set when the ECM detects a malfunction within the cruise control input circuit, in this case it means there is a low voltage condition.

Cruise control switches:

What is the severity of this DTC?

This particular code is actually a mild issue that does not require immediate repair since the engine performance won't suffer which will allow the vehicle itself to be operational. Not being able to utilize the cruise control is the only main issue with this kind of code.

Having said that, It is important to note, that when the ECM displays a P0576, or any other P code for that matter, the vehicle might not be able to pass an emissions test. That is why clearing the code after every repair is a must before performing a retest. The mechanic won't be able to exactly identify the problem if this is overlooked and it could lead to more serious issues in the future.

What are some of the symptoms of the code?

The most common symptom out there in regards to the P0576 code, is the fact that the cruise control system itself or any of it's functions stop working. Other potential symptoms may include:

CEL (check engine light) will turn on within a few drive cycles after the ECM has detected that there's an issue Erratic or intermittent cruise control function(s) operation Cruise control light on constant or does not come on

What are some of the common causes of the code?

Causes for this P0576 cruise control code may include:

The most common cause of abnormal voltage/resistance level in the cruise control input circuit is a faulty cruise control switch that could potentially be caused by spilled liquids that short circuits the device and/or circuits within. Wiring issue (e.g. open circuit, short to ground, short to power, etc.) ECM (engine control module) issue (i.e. internal short, open, etc.) Open or shorted cruise control function switch(s) Damaged connectors within the cruise control system Blown fuses, which could indicate a much more serious problem. (e.g. short, voltage spikes, control module(s) defective, etc.)

What are some P0576 diagnostic and troubleshooting steps?

The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle.

Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.

Basic Step

_{Read: 35}