B1252 Code Meaning, Causes, Symptoms, & How to Fix

The B1252 code refers to a problem with the media hub in a vehicle. It is triggered when there is an over-current condition in the USB circuit connecting the media hub to the Accessory Protocol Interface Module (APIM).

Symptoms may include a malfunctioning media hub or the inability to connect devices to the hub.

The code can be caused by faulty USB cables and ports, open or shorted USB cable and port harnesses, poor electrical connections, or a faulty APIM.

To fix the issue, a visual inspection of the wiring harness and connectors is needed.

The cost of repair may vary depending on the vehicle’s make, model, and location.

B1252: Loss of Ground In the Media Hub

What does it mean

The B1252 diagnostic trouble code indicates a loss of power or ground in the media hub, disabling its functionality.

To prevent this code, ensure the USB cable and port are in good condition.

Check the wiring harness, connectors, and USB cable for damage.

Consider replacing the faulty Accessory Protocol Interface Module (APIM) if necessary.

What are the symptoms

The B1252 diagnostic trouble code may cause the Engine Light (or Service Engine Soon Warning Light) to turn on. Other symptoms may also occur, but they are not specified.

Technicians should avoid common diagnostic mistakes when dealing with this code:

1. Visually inspect the wiring harness and connectors to identify any potential issues.
2. Check for damaged components, such as broken or bent connector pins, that could be causing the problem.
3. Address any issues found with the USB Cable and Port, as they could be the source of the over-current condition.
4. Consider replacing the faulty Accessory Protocol Interface Module (APIM), if necessary.

To prevent DTC B1252, regular maintenance is recommended. Here are some maintenance tips:

1. Inspect and replace any damaged or frayed USB cables.
2. Keep the USB port clean and free of debris.
3. Avoid using low-quality or incompatible USB devices that could cause an over-current condition.

What are the causes

Causes of the B1252 Diagnostic Trouble Code:

1. Faulty USB cable and port leading to loss of power or ground, disabling the media hub.
2. USB cable and port harness is open or shorted.
3. Weak electrical connection in the USB circuit.
4. Defective Accessory Protocol Interface Module (APIM).

What Tools are Needed to diagnose

To diagnose the B1252 diagnostic trouble code, automotive technicians will need specific tools to accurately troubleshoot and analyze the issue. Some of the tools required for B1252 diagnosis include:

• OBD-II Scanner: This scanner is necessary for retrieving the B1252 code from the vehicle’s computer system. It allows technicians to access the onboard diagnostic system and retrieve trouble codes.
• Multimeter: A multimeter is used to measure voltage, resistance, and continuity in the electrical circuits. This tool helps technicians check for proper electrical connections and identify any faults in the USB cable and port or other related components.
• Wiring Diagrams: Wiring diagrams provide detailed information about the electrical connections in the vehicle. Technicians can use these diagrams to trace the wiring harness and identify any issues such as open or short circuits.
• Inspection Light: An inspection light is used to visually inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections.

How to fix Step by Step

Step 1: Visually inspect the related wiring harness and connectors for any signs of damage or wear. Check for loose or corroded connections.

Step 2: Examine the USB cable and port for any faults. Look for any physical damage, such as frayed wires or bent pins.

Step 3: Test the USB cable and port for proper functionality. Use a multimeter to check for continuity and ensure that the circuit is not open or shorted.

Step 4: If any issues are found with the USB cable and port, address them accordingly. Repair or replace any damaged components.

Step 5: Consider replacing the Accessory Protocol Interface Module (APIM) if all other steps have been exhausted and the issue persists.

Step 6: Following this step-by-step guide should help in resolving the DTC B1252 code. Remember to consult the vehicle’s service manual for specific instructions and to use the appropriate tools for the job.

What are the Common Diagnosis Mistakes

Common diagnosis mistakes related to the B1252 code can result in incorrect repairs and wasted time and resources. It is important to be aware of the common errors and misunderstandings about the B1252 code to avoid these problems.

Here are two common diagnosis mistakes to be cautious of:

1. Misunderstanding the code: One common mistake is assuming that the B1252 code directly indicates a faulty USB cable or port. Although this is a potential cause, it is important to thoroughly examine and test all related components before making conclusions.
2. Overlooking other potential causes: Another common mistake is solely focusing on the USB cable and port while neglecting other potential causes, such as a faulty Accessory Protocol Interface Module (APIM) or poor electrical connections. It is vital to conduct a comprehensive diagnostic process to accurately identify all possible issues.

What is the Repair Cost

The average labor cost is about $100 per hour, and the parts cost may vary from $10 to $200 or more . Therefore, the total repair cost could range from $110 to $300 or more.

To get a more accurate estimate, you can use the RepairPal website, which allows you to enter your vehicle information and location, and get a customized quote for the B1252 code repair. 🚗

Can I drive safely with this code?

Driving safely with the B1252 code is not recommended. It indicates an over-current condition in the USB circuit connecting the media hub to the APIM. This can result in power loss to the media hub, disabling its functionality and potentially causing other issues.

Diagnosis requires a scan tool and inspection of wiring, connectors, and USB components.

Wrapping Up

The B1252 code relates to an over-current condition in the USB circuit that connects the media hub to the Accessory Protocol Interface Module (APIM) in a vehicle.

This code can be caused by various factors such as a faulty USB cable and port, open or shorted USB cable and port harness, poor electrical connection in the USB circuit, or a faulty APIM.

It is important to conduct a thorough inspection and address any damaged components to resolve the issue.