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B1969 OBD-II Trouble Code: Air Conditoner Clutch Magnetic Control Circuit Failure

diagnostic check engine light

B1969 code definition

The B1969 trouble code detects an AC clutch magnetic control circuit malfunction.

What the B1969 code means

The B1969 code is a standard OBD-II trouble code that signals a circuit error in the AC clutch magnetic control system. The magnetic clutch is part of the AC compressor, which is a critical piece of the climate control system. The clutch lets the compressor engage and disengage, which allows the AC refrigerant to move through the evaporator, condenser, and expansion valve. When the climate control module detects a circuit problem from the magnetic clutch control, then the B1969 code may be triggered.

What causes the B1969 code?

The most likely cause of the B1969 code is damaged electrical components in the climate control system, and specifically in the magnetic clutch control. Shorted wires, open connectors, and blown fuses are all common culprits. A defective magnetic clutch is also a common cause. While a little less common, this code can also be caused by a failed AC compressor. Finally, a faulty climate control module is sometimes responsible for the B1969 code, though this is fairly uncommon.

What are the symptoms of the B1969 code?

The B1969 trouble code may be accompanied by an illuminated check engine soon warning light on the instrument panel, or a flashing AC light on the center console. The air conditioning system likely will not work properly, which may result in erratic air temperature, or a complete lack of any air conditioning.

How does a mechanic diagnose the B1969 code?

The B1969 trouble code will be diagnosed using a standard OBD-II trouble code scanner. A trained mechanic will assess the code by viewing the freeze frame data from the scanner. The scanner will also be used to see if there are any additional trouble codes present. If multiple codes are detected, then they will need to be diagnosed in the order that they appear in on the scanner. The trouble codes will then be reset and the vehicle restarted, so that the technician can check for the B1969 code. If the code is no longer present, then was likely inaccurately detected, or represents an intermittent error.

If the code is still detected, then the mechanic will begin by visually inspecting all of the electrical components in the system, and replacing any parts that are damaged. The magnetic clutch should then be inspected, followed by the AC compressor.

After any replacements or repairs are made, the trouble codes will again be reset, and the vehicle again restarted, so the B1969 code can be checked for. This will allow the technician to know as soon as the issue is fully fixed.

Common mistakes when diagnosing the B1969 code

The most frequently made error when assessing this code comes from a failure to comply with the standard OBD-II trouble code diagnosis protocol. The diagnosis protocol should be followed step by step, at all times, as it helps ensure a thorough and accurate repair.

Magnetic clutches that are working properly are frequently condemned because the electrical system was overlooked during inspections.

How serious is the B1969 code?

A vehicle with the B1969 trouble code will be completely drivable, with no drivability issues at all. However, the air conditioning system will likely function poorly, which may mean no cold air at all. This can be impractical and uncomfortable, so a diagnosis should be schedule as soon as the code is detected.

What repairs can fix the B1969 code?

Potential repairs for the B1969 trouble code are:

Additional comments for consideration regarding the B1969 code

This code is a manufacturer specific code, which means that the definition changes from automaker to automaker. The B1969 code detects an AC magnetic clutch control circuit failure in some cars, but suggests a different body problem for other manufacturers. Technicians should be aware of the vehicle they are working on anytime they diagnose the B1969 trouble code.

Need help with a B1969 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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