How to Fix the P0650 Code

Understanding the P0650 Code

P0650 Code

If you own a car, you might have experienced the check engine light turning on at some point. This light indicates that there’s an issue with your vehicle, and it needs to be fixed as soon as possible. If you’ve recently checked your car’s diagnostic trouble codes, you might have come across the P0650 code. This code can be tricky to understand, but don’t worry, we’ve got you covered. In this article, we’ll discuss what the P0650 code means and how you can fix it.

The P0650 code refers to a malfunction in the electric control module (ECM) power relay control circuit. The ECM is responsible for managing various systems in your car, such as the engine, transmission, and exhaust. It receives data from various sensors and relays and processes the information to ensure that everything is running smoothly. If there’s an issue with the ECM power relay control circuit, it could cause problems with the car’s performance and fuel efficiency.

One of the most common causes of the P0650 code is a faulty ECM power relay. This relay is responsible for providing power to the ECM, and if it’s not working correctly, the ECM won’t be able to function correctly. Another cause of the P0650 code is a damaged or frayed wire in the ECM power relay control circuit. This can happen due to wear and tear over time or due to damage from an accident.

If you’ve checked your car’s diagnostic trouble codes and found the P0650 code, don’t panic. While this code can be challenging to understand, it’s relatively easy to fix if you know what you’re doing. The first step is to check the ECM power relay and ensure that it’s working correctly. You can do this by using a multimeter to test the voltage across the contacts of the relay.

If the ECM power relay is working correctly, the next step is to check the ECM power relay control circuit for any damaged or frayed wires. You’ll need to use a wiring diagram to identify the correct wires to check and use a multimeter to test them for continuity. If you find any damaged wires, you’ll need to replace them to fix the issue.

If you’re not comfortable troubleshooting these issues yourself, it’s best to take your car to a mechanic. They’ll have the tools and expertise to diagnose the problem correctly and fix it quickly. Ignoring the P0650 code could cause long-term damage to your car’s ECM or other systems, so it’s important to address it as soon as possible.

In conclusion, the P0650 code can be tricky to understand, but it’s relatively easy to fix if you know what you’re doing. If you’ve checked your car’s diagnostic trouble codes and found this code, the first step is to check the ECM power relay and the ECM power relay control circuit for any issues. If you’re not comfortable troubleshooting these issues yourself, it’s always best to take your car to a mechanic for proper diagnosis and repair.

Common Causes of P0650 Code

P0650 Code Causes

When the check engine light comes on, and a mechanic reads the code p0650, it means there is a fault in the vehicle’s internal control module or in the software. There are several possible causes for this error code:

1. Malfunctioning Internal Control Module

The most common cause of the P0650 code is a malfunctioning internal control module (ECM). The ECM, which is responsible for managing various functions in the vehicle, including the fuel injection, ignition, and emissions system, can develop faults that may trigger this error code. If the ECM detects any anomalies, it will set the error code P0650 and illuminate the check engine light. In this case, the ECM may need to be replaced, which can be quite expensive.

2. Faulty Wiring or Connectors

Another common cause of the P0650 code is faulty wiring or connectors between the engine control module and various sensors. This can cause the ECM to lose connection to these sensors and could result in the error code P0650. Inspect all the electrical wires that go in and out of the ECM for any signs of damage or corrosion. Disconnect and reconnect all connectors that the module is connected to for proper contact. If any damage is detected, they should be repaired or replaced to ensure that the connection is reestablished.

Steps on how to check faulty wiring or connectors:

  • Inspect the wiring harness around the ECM for any signs of physical damage, such as cuts, nicks, or abrasions.
  • Check for loose electrical connections and corroded pins in the ECM connectors
  • Ensure that all wiring harness connectors are correctly connected and not misaligned.
  • Check continuity of the wiring harness with a multimeter to ensure that there are no breaks or shorts in the wiring.
  • Check the voltage output of the sensors with a voltmeter to ensure that they are sending the correct signals to the ECM.

3. Faulty Sensors

Along with wiring issues, the P0650 code can also be triggered if the sensor responsible for communicating with the ECM is faulty. This is often the case with the throttle position sensor or the engine coolant temperature sensor. Any sensor that communicates with engine control module could cause this error code if the readings are out of range.

Steps on how to check faulty sensors:

  • Check for any loose or corroded connectors between the sensor and the harness.
  • Check for any physical damage that may have affected the sensor’s measurement ability.
  • Check the sensor’s output voltage – a deviation from what is expected can signify a sensor issue.
  • Sensors like MAP and MAF should be checked for any obstructions and make sure that they are clean.
  • If it is determined that specific sensors are faulty, they may require replacement

4. Control Module Programming Errors

The P0650 code could also appear if there are programming errors in the module. Such programming errors could prevent the engine control module from reading the sensor data it requires, causing the vehicle’s check engine light to turn on. This issue can be resolved by resetting the vehicle’s control module.

Steps on how to reset the control module:

  • Use an OBD II scanner and hook it up to the vehicle’s OBD II port.
  • Read the codes and identify P0650 code.
  • Select the reset control module function option.
  • After resetting, check for the P0650 code again.

In conclusion, getting the p0650 error code could signify several issues that require diagnosis from a professional mechanic. Some of the causes of the code include faulty wiring and connectors, malfunctioning internal control module, programming errors, or faulty sensors. It’s essential to catch the cause right away to avoid the occurrence of more dangerous malfunctions that could cause severe safety hazards.

Steps to Fix P0650 Code

OBD-II Readiness Test

When your car’s OBD-II system detects a problem, it stores a trouble code to help diagnose the issue. One of these codes is P0650.

This code is related to the Malfunction Indicator Lamp (MIL) Control Circuit in your car. It indicates that there’s a problem with the control circuit that turns on the Check Engine light.

When this happens, you’ll see the Check Engine light come on and you may experience some drivability issues as well. Some other common symptoms of P0650 include:

  • Reduced fuel efficiency
  • Difficulty starting your car
  • Stalling or hesitation while driving
  • Frequent misfires

If you’re experiencing any of these symptoms along with the P0650 code, it’s important to get your car diagnosed and fixed as soon as possible.

Here are the steps you can take to fix the P0650 code:

Step 1: Check Your Battery

Battery Check Up

The first thing you should do when you see the P0650 code is to check your car’s battery. A weak or dead battery can cause all sorts of problems with your car’s electronics, including the MIL control circuit.

Use a multimeter to check the battery’s voltage. A healthy battery should read between 12.6 and 12.8 volts. If the voltage is low, you may need to charge or replace the battery.

Step 2: Check the MIL Control Circuit

MIL Control Circuit

If your battery is in good condition, the next step is to check the MIL control circuit itself. You’ll need a digital multimeter for this step.

Here are the steps to follow:

  1. Disconnect the negative battery cable.
  2. Locate the PCM (powertrain control module) and find the wiring harness that connects to it.
  3. Using a wiring diagram, identify the wire that goes to the MIL light.
  4. Set your multimeter to voltage and connect the positive lead to the wire that goes to the MIL light.
  5. Reconnect the negative battery cable.
  6. Turn the key to the “on” position but don’t start the engine.
  7. If your multimeter reads voltage, the MIL control circuit is functioning correctly. If not, you’ll need to further diagnose the issue. This may involve inspecting the wiring and connectors for damage or corrosion.

Step 3: Perform an OBD-II Readiness Test

OBD-II Readiness Test

Finally, after repairing the MIL control circuit, you’ll need to perform an OBD-II readiness test. This will confirm that the issue has been fixed and the car is now ready for an emissions test.

Here’s how to do an OBD-II readiness test:

  1. Ensure your car has a full tank of gas.
  2. Ensure all accessories are turned off.
  3. Ensure the Check Engine light is off.
  4. Drive your car at highway speeds for at least 20 minutes.
  5. Perform a series of stops and starts at different speeds and idle for 2 minutes.
  6. Have your car checked for emissions
  7. If everything was done correctly, your car should pass the readiness test and the Check Engine light should remain off.

Fixing the P0650 code can be a bit complicated, but as long as you follow these steps, you should be able to get your car back on the road in no time. Just remember to be patient and take your time diagnosing and repairing the issue.

Resetting the P0650 Code

Resetting the P0650 Code

The P0650 code refers to a diagnostic trouble code that appears on a car’s onboard diagnostic system when there is a problem with the malfunction indicator lamp (MIL) circuit. This error code can be caused by several factors, including a malfunctioning of the MIL circuit or components, a problem with the OBD-II system’s computer, and even an issue with the car’s battery or wiring. To reset the P0650 code, follow the simple steps listed below.

Step 1: Diagnose the Problem

automotive diagnostic scanner

Before resetting the P0650 code, it is important to diagnose and troubleshoot the problem. This can be achieved by using an automotive diagnostic scanner to read the code and identify the exact cause of the issue. The scanner will provide a detailed report on the car’s onboard computer system and help locate the specific problem.

Step 2: Check the MIL Circuit and Components

Check the MIL Circuit and Components

Once you have identified the problem, it is important to check the MIL circuit and related components. Look for loose or broken connections, worn-out wires or damaged components. Make sure to replace or repair any faulty elements to avoid the issue from reoccurring.

Step 3: Clear the Code

Clear the Code

Once you have solved the problem, use the diagnostic scanner to clear the P0650 code. To do this, select the “clear codes” option on the scanner and follow the instructions. Make sure to perform a second scan to confirm the problem has been solved before driving the car again.

Step 4: Drive and Retest the Car

Drive and Retest the Car

After clearing the code, take the car for a spin to make sure that everything is functioning correctly. Drive under normal operating conditions and monitor the car’s performance. After driving for some time, perform a second scan to confirm the code has been cleared completely.

Preventative Measures

To prevent the P0650 code from appearing in the future, it is essential to maintain the car’s electrical system properly. This includes regularly checking the battery, wiring, and sensors for any issues, ensuring all elements are correctly connected, and following the manufacturer’s maintenance instructions. Regular servicing and maintenance should help prevent any issues from escalating and avoid any expensive repairs. Also, consider using an automotive diagnostic scanner to troubleshoot minor issues before they worsen.

In conclusion, resetting the P0650 code is not complicated if you follow the correct procedure. After diagnosing the problem, fixing the MIL circuit and components, and clearing the code, take the car for a spin to confirm the issue has been resolved. Follow standard preventative measures to avoid future issues and make sure to maintain your car’s electrical system properly.

Seeking Professional Help for P0650 Code

car repair

If you have received the P0650 code, it can be concerning as it is related to the Malfunction Indicator Lamp (MIL) and it requires immediate attention. Although there are several DIY options to fix the issue, seeking professional help can be your best bet. Here are five reasons why you should seek professional help for a P0650 code:

1. Accurate Diagnosis

car mechanic

When you take your car to an experienced mechanic, you can trust that they will accurately diagnose the issue. They have access to sophisticated diagnostic tools and the expertise to understand what the problem is. Moreover, the mechanic will be able to identify the root cause of the issue, whereas a DIY approach may only address the symptoms.

2. Proper Tools and Equipment

auto repair tools

Fixing a P0650 code may require specialized tools and equipment that are unavailable to an average car owner. Seeking professional help ensures that your car will be fixed with the right resources, preventing further damage from occurring. In addition, professional repair shops carry insurance, which means your car will be protected if something goes wrong during the repair process.

3. Saving Time and Money

time is money

Solving a P0650 code can be time-consuming for an amateur. If you are not familiar with cars, you may end up spending a lot of time researching and fixing the wrong problem, leading to additional expenses. By seeking professional help, you save yourself time, effort, and money.

4. Identifying Other Issues

vehicle inspection

When you bring your car to a professional repair shop, technicians perform a thorough inspection of your vehicle. This inspection can help identify other issues that require attention, like worn-out brake pads or damaged suspension. By identifying and fixing these issues early on, you prevent future and more costly repairs.

5. Warranties and Guarantees


A reliable repair shop provides warranties and guarantees on their work to ensure customer satisfaction. This means that if something goes wrong after the repair, you can bring your car back for a follow-up repair at no cost. However, it’s important to read and understand the terms and conditions of the warranty before agreeing to the repair.

Overall, if your car is showing signs of the P0650 code, don’t hesitate to seek professional help. Taking your car to a professional repair shop has numerous benefits and can save you time, money, and frustration in the long run.

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