P0650 Fault Code

Long Description

Fault code P0650 is logged when the vehicle’s primary computer, the powertrain control module (PCM), has detected an issue with the malfunction indicator lamp (MIL). It is also known as the Check Engine Light (CEL) or Service Engine Soon light.

The purpose of the CEL is fairly obvious. The light will become illuminated when there is an issue somewhere in the vehicle. It is also one of the most clear indications that the vehicle has logged a fault code.

This is done to alert the driver of any issues, which is particularly helpful for problems that may not be immediately noticeable through other symptoms.

The CEL does not come on for every issue though. It is typically reserved for problems that have a significantly adverse effect on the driveability or safety of the vehicle.

All vehicles have a CEL nowadays, meaning every manufacturer can have this issue. That said, Chevrolet, GMC, Hyundai and Kia are among the most commonly reported for this issue.

Other Signs of This Problem

This code is somewhat ironic when it comes to its symptoms. For a large majority of fault codes, the presence of the CEL on the dashboard is one of the most obvious signs of a problem.

Of course, with the CEL not working properly, it will not light up on the dashboard in most cases.

However, it is also possible that the light behaves unusually in other ways. This can include erratic blinking or remaining on all the time without any other issues causing it to be on correctly.

It is always good practice to have the vehicle scanned for fault codes when the CEL is illuminated or blinking.

There are no other codes that really relate to this issue. However, some manufacturers have opted for their own manufacturer-specific codes. The most notable are P1641 and P1661.

What Could Be The Problem?

The cause of the problem will almost always be found within the CEL light circuit itself.

One of the most common causes is that the bulb has simply burnt out.

In addition to this, there may be electrical faults within the circuit. This can include damaged wires or loose connections to the instrument cluster.

A faulty instrument cluster can also be the cause of this issue, depending on the circuit for the CEL. A faulty cluster will likely display issues with other lights or gauges.

As with most fault codes, it is also possible that a faulty PCM can cause the code to be logged. However, this is fairly rare.

Fixes

Fixing this fault code will involve making repairs to electrical faults or replacing faulty components in the CEL circuit.

If it is determined that the instrument cluster is faulty, it should be replaced before addressing any other issues.

Thereafter, check that the CEL is not blown. If it is, simply replace it.

The next step would be to check the light’s circuit to ensure there are no damaged wires or loose connections.

If it is determined that the PCM is at fault, this should be replaced.

Seriousness

Fault code P0650 is a moderately serious issue. Of course, there is no immediate danger from the light not working properly. However, it is important to realize that more severe issues that require immediate attention could be missed by owners because the vehicle’s primary method of warning them, the CEL, is not working.

It is a good idea to have this code fixed immediately, especially given the relative ease it can be done.