P0572 OBD Error Code: Problem & Solutions

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The P0572 error code would start appearing when the lower than normal voltage from the brake switch circuit has been detected by the car’s computer. There are a lot of reasons why a brake switch is used in a vehicle including operating the shift interlock, turning the brake lights on when the pedal is pressed and deactivating cruise control while driving.

If low voltage of the brake switch circuit has been determined by the computer, then it would disable cruise control and would set up the P0572 code. Due to this the check engine light would start illuminating.

The fault code P0572 can be described as Cruise Control/Brake Switch A Circuit Low. This trouble code would start indicating that the cruise control system or brake switch is malfunctioning and the voltage has been detected lower than the usual by the car’s computer.

What causes this problem with the Cruise Control/Brake Switch A Circuit Low?

• Flaws in the engine control module
• Debris/dirt might be mechanically hindering brake switch operation
• Adjustment issues in the brake switch
• Defaults in the cruise control or brake switch
• Wiring issues like pinched on brake pedal, chafed, etc
• Some quirks in the brake switch

1. Fuel Injection Harness - Defective car Fuel Injection Harness can be a major reason why P0572 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
2. Powertrain Control Module - Everything is okay with the Fuel Injection Harness and still OBD code P0572 triggering? Then there must be some defects in Powertrain Control Module. Replace them as soon as possible.
3. Cruise Control Switch - P0572 code flashing? Get your Cruise Control Switch inspected from a mechanic.
4. Engine Control Module - If everything is alright with Cruise Control Switch, then there is surely some defect in Engine Control Module. Get it replaced before the situation gets worse.
5. Fuel Injector - P0572 code can display due to some faults in the Fuel Injector. So, it is very important to replace the Fuel Injector with us at equitable prices
   

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Inoperative cruise control
• The cruise control operation might be erratic
• No brake lights if the brake light switch is quirky
• There can be certain functions which are not operating as they should
• Cruise control turning on but not engaging

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• You can always adjust a poorly adjusted brake light switch
• The blown fuses should be replaced
• Restore the defective cruise control modules
• Carefully repair a failed cruise control switch

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Here are some steps which you should follow in order to diagnose this fault code:

• 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.
• The 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.
• You must peek under the dash and take a look at the brake switch right away. It is usually mounted to the brake pedal arm itself. Many a times it has been seen that the driver's foot break the switch completely off its mount so, if it's not mounted properly or it is completely broken, you will be able to tell immediately and potentially save yourself some time and shop fees
• So if this is the case, then you should replace the cruise control/brake switch with a new one. Make sure to follow manufacturer specific brake switch installing and adjusting procedures to avoid damaging the sensor or even causing more problems
• The circuit which is involved should be verified properly. Refer to a wiring diagram in your service manual to determine the colour codes and designation for the cruise control/brake switch A circuit. A lot of times, to rule out the possibility of the fault being present in the harness itself, you can disconnect one end from the brake switch and the other from the ECM. You can perform a lot of tests using a multimeter. One common test is a continuity test. Manufacturer provided specifications are needed to compare the actual values to the desired ones. Generally speaking, you will be checking the resistance of the particular circuit to determine any opens, high resistance, etc present. If you are performing this test, it would be a good idea to inspect the pins in the connectors, switch, and ECM. Sometimes moisture can creep through and cause intermittent connections. If there is corrosion present, use electrical connection cleaner to remove before reconnecting everything
• Take a look at your engine control module. It is important to note, sometimes with cruise control, it is the BCM (body control module) that monitors and adjusts this system. Pinpoint which one your system uses and physically inspect for any water intrusion

Common Mistakes When Diagnosing The P0572 Code

• A common mistake which can be made while diagnosing the P0572 code can be to assume that there is some fault with the brake light switch and simply replacing the switch without actually doing the further diagnosis.
• Yes many a times there can be issues with the brake light switch, but a full diagnosis is needed to rule out other potential causes including simple issues like blown fuses or liquid spills on the cruise control switch