Trouble code solution P0650: decoding, causes, resetting, meaning

Contents

Technical description and explained code P0650
Symptoms of vehicle malfunctions
Factors that can cause this error code
How to fix or reset OBD-2 code P0650
Diagnose and repair of problems
On which vehicles does this problem occur most frequently
Video

Fault code P0650 is called “Malfunction Indicator Lamp (MIL) Control Circuit Malfunction” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P0650

Diagnostic Trouble Code (DTC) P0650 is a common error defined as a Malfunction Indicating Lamp (MIL) circuit fault. It is set when the vehicle’s transmission control module detects a fault in the electrical circuit of the Malfunction Indicating Lamp (MIL).

The vehicle’s Malfunction Light (MIL) serves to alert the driver that something is wrong in one or more circuits. These circuits control the proper operation of the vehicle’s components and mechanisms. All of these circuits are connected by controllers that receive data from the vehicle’s sensors.

The controllers, or control modules, are interconnected via a large number of circuits which are interconnected via the CAN bus. In this system, the PCM acts as a clearinghouse with a central processor. Which ultimately controls or monitors the operation of all other controllers.

If the specialized control circuits of the PCM or any other controller are affected by a failure or malfunction. Then the PCM will be notified and will set code P0650 to indicate that a problem or fault exists.

This fault relates to the controller control lamp circuit, but may also apply to the fault indication itself (MIL).

Symptoms of vehicle malfunctions

The main signal that an error P0650 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

The malfunction indicator lamp does not illuminate when it should.
MIL illuminates constantly, even in the absence of any malfunction.
No symptoms other than error code P0650 being stored in the computer memory.

The severity of fault code P0650 can range from minor to severe. The malfunction indicator light tells the driver if there is a possible problem with the vehicle. If this indicator light is not working properly, the driver will not be able to know of any faults present that need to be resolved as soon as possible.

Factors that can cause this error code

The error code P0650 can mean that one or more of the following problems have occurred:

MIL LED or lamp has blown out.
Short circuit or open circuit in MIL wiring.
Poor electrical connection at the lamp.
Faults or malfunctions in MIL related circuits.
Faulty CAN bus.
Faulty PCM or other control module, also possible programming error.

How to fix or reset OBD-2 code P0650

Some suggested steps for troubleshooting and fix the error code P0650:

Inspect the wiring for damage, abrasions, breaks, and shorts. If the wiring is damaged, repair or replace it.
Check to see if the malfunction indicator light is burned out.
Check to see if the malfunction indicator lamp fuse is blown.
If all is good, the PCM may need to be replaced and reprogrammed.

Diagnose and repair of problems

The first thing to do is to check if the light comes on at the proper time. It should come on for a few seconds when the ignition is turned on. If the light comes on for a few seconds and then goes out, there is nothing wrong with it. A working light is also indicated by the fact that it stays on.

If the malfunction indicator light does not come on at all, you need to determine the cause of the problem.

Check to see if it has burned out, replace it if necessary. Also inspect if the lamp is properly installed and if there is a good electrical connection. Visually inspect all wiring and connectors leading from the MIL lamp to the PCM.

Inspect the wires for worn insulation. Disconnect all connectors as necessary to check for bent contacts, corrosion, and broken terminals. If any problems are found, clean or repair as necessary.

Check that the other elements of the instrument cluster are working properly, as well as the other indicator lights. Note that you may need to remove the unit during the diagnostic steps.

If your vehicle is equipped with a PCM or MIL fuse, check it and replace it if necessary. Use a digital voltmeter to check the appropriate wires in the circuit at the end of the lamp and the end of the PCM. Check for a ground short or open circuit.

If everything meets the manufacturer’s specifications, but the P0650 error remains, replace the PCM, it may be an internal fault. Replacing the PCM is a last resort and requires the use of specialized equipment to program it.