B1325 code — how to fix error fast

OBD2 codes can be pretty confusing and problematic, and code B1325 is one of the most common codes. It may come along with some HVAC system issues, which is why you need to be aware of the B1325 code meaning and influence on your car to properly diagnose and fix it.

Luckily, you can rely on our team to help you out and guide you to the solution. We’ve prepared this guide just to help you cope with the code and that includes discussing the most common causes, as well as giving you a few insights on the main solutions.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the B1325 code mean?

The B1325 code is a fault code that is stored in a vehicle’s computer system when there is a malfunction in the HVAC system. Specifically, it is related to the temperature sensor circuit in the HVAC system. The code is triggered when the signal from the temperature sensor is outside the expected range.

The consequences of the B1325 code can include poor performance of the HVAC system, such as a failure to heat or cool the car properly, and can also lead to a range of other problems.

What causes the B1325 code?

Even though most of the possible reasons behind the code B1325 have something to do with the HVAC system, it’s not enough to simply count on that fact. Moreover, there are several other related issues that could trigger the code, so let’s see what we can tell you about each of those:

Faulty temperature sensor

The most common cause of the B1325 code is a faulty temperature sensor. The temperature sensor is responsible for measuring the temperature of the air that is being circulated through the HVAC system. If the sensor is not functioning correctly, it can send an incorrect signal to the computer system, triggering this fault code.

Wiring problems

Another potential cause of the code is wiring problems in the HVAC system. If there is a short circuit or an open circuit in the wiring, it can affect the signal that is sent by the temperature sensor.

HVAC control module failure

The HVAC control module is responsible for controlling the HVAC system in a vehicle. If the control module fails, it can cause a range of problems, including triggering the B1325 code.

Which car models does the B1325 code affect the most?

The B1325 code can affect a range of car models, but it is most commonly found in vehicles that are equipped with automatic climate control systems. These systems are more complex than manual systems and are more prone to faults and malfunctions in the following models:

• Cadillac Escalade:: The Escalade is a vehicle that has been reported to experience problems with the passenger compartment temperature sensor.
• Dodge RAM: The Dodge Ram pickup models may also be susceptible to this problem due to the HVAC control module failure.
• Ford F-150: Some models of Ford’s popular F-Series trucks like the F-150 have been known to develop issues with the passenger compartment temperature sensor over time.

How to diagnose the B1325 code

Diagnosing the B1325 code requires a thorough understanding of the HVAC system and the use of specialized diagnostic tools. Here are the steps to diagnose the code:

Check the codes

The first step in diagnosing this code is to check the codes stored in the vehicle’s computer system. This can be done using a diagnostic tool that is connected to the vehicle’s OBD-II port and it can tell you more about the nature of the problem as well as the most likely culprit.

Inspect the wiring

The next step is to inspect the wiring in the HVAC system. Look for any signs of damage or wear and tear, and check for any loose connections.

Test the temperature sensor

The temperature sensor can be tested using a multimeter. Check the resistance of the sensor against the manufacturer’s specifications.

Test the HVAC control module

If the temperature sensor and wiring are both functioning correctly, the HVAC control module may be the cause of the B1325 code. The control module can be tested using a specialized diagnostic tool.

How to fix the B1325 code

Fixing the B1325 code will depend on the cause of the code. This is where all the mentioned possible causes come in handy, so now that you know about all of them, you can apply one of the following solutions:

Repairing the faulty temperature sensor

If the temperature sensor is faulty, it will need to be replaced. The cost of a replacement sensor will vary depending on the make and model of the vehicle, but it’s usually somewhere between $30 to $300 on average.

Wiring problems

If there is a problem with the wiring, it will need to be repaired or replaced. The cost of this repair will depend on the extent of the damage and the location of the wiring.

HVAC control module failure

Finally, in case the HVAC control module is faulty, repairing it or replacing the module can help solve these issues.

How to prevent the B1325 code

Preventing the B1325 code will require proper maintenance of the HVAC system. Here are some preventative measures:

• Regularly servicing the HVAC system
• Replacing air filters and cleaning the ducts
• Checking refrigerant levels
• Avoiding driving in extreme temperatures while using the HVAC system

By sticking with these methods, you can prevent the code from reappearing in your car, which comes in useful once the HVAC system components are replaced and brand new.

Our take

In the end, it turns out that it’s easier to fix the B1325 code than it seems, and all you have to do is be aware of the code’s implications and common reasons that may have triggered it. So, sticking with our guide can help you properly determine the reasons behind the code and remove it.