Guide To P0573 OBD Error Code Solutions

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The P0573 trouble code would be stored in by the powertrain control module because of an electrical malfunction affecting your vehicle’s cruise control brake switch “A” circuit.

The error code P0573 can be defined as Cruise Control/Brake Switch A Circuit High.

The powertrain control module and cruise control module work together to automatically control the speed of the vehicle. If an input is received by the powertrain control module which would alert it that the vehicle can no longer control its own speed, then it would start initiating a test of the entire cruise control system. The P0573 fault code would start triggering up when the powertrain control module of your vehicle would sense an abnormal resistance/voltage level in the cruise control brake switch circuit during this test.

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

• Defective cruise control or brake switch
• There can be some wiring issues like pinched on brake pedal, chafed, etc
• The engine control module might have some defects
• Debris/dirt might be mechanically hindering brake switch operation
• Brake switch might not be adjusted properly
• Issues with the brake switch

1. Cruise Control Switch - Do you remember when was the last time you got your car Cruise Control Switch checked up? A faulty Cruise Control Switch can cause a lot of issues like displaying P0573 code.
2. Engine Control Module - Poor Engine Control Module can cause a lot of difficulties, so why not get it replaced at time?
3. Powertrain Control Module - Are there some faults in your Powertrain Control Module? Don’t waste time and get them replaced or else P0573 code can turn up.
4. Fuel Injection Harness - OBD Code P0573 can appear because of faulty Fuel Injection Harness.
5. Fuel Injector - Everything is fine with Fuel Injection Harness and still P0573 code triggering? Then you must get your Fuel Injector checked.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0573 code by mentioning some major symptoms below:

Common Symptoms

• The cruise control operation might be erratic
• There can be certain functions which are not operating as they should (e.g. set, resume, accel., etc.)
• Cruise control turning on but not engaging
• No brake lights if the brake light switch is defective
• Inoperative cruise control

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0573:

• The wires or connectors which are causing the problem should be fixed
• Repair the blown fuse
• 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 thing which you have to do is to 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 P0573 Code

• Keep in mind to check for fuses that may have blown either before or after the P0573 code was triggered up
• This should be done before any serious repairs or replacements occur because both often happen due to problems that stem with a blown fuse