The B1242 code signifies a problem in the communication system between the key transmitter and the main body ECU of a vehicle. This can lead to various symptoms such as issues with starting the vehicle, intermittent electrical problems, or the inability to lock or unlock the doors.
The causes of this code can range from a faulty key transmitter, a malfunctioning main body ECU, wiring issues, or a weak battery.
To fix the issue, it is recommended to perform a thorough diagnostic examination to identify the exact cause. This may involve checking the key transmitter, inspecting the wiring connections, testing the main body ECU, and ensuring the battery is in good condition.
Given the complexity of the repair process and the need for specialized equipment, it is advisable to seek the assistance of a professional automotive technician.
B1242 Code: Wireless Door Lock Tuner Circuit Malfunction
What does it mean
The B1242 code indicates an issue with the Door Control Receiver’s communication with the Certification ECU in the vehicle’s key transmitter system.
It is important to promptly address this code to avoid further issues or malfunctions.
Troubleshooting techniques include inspecting wiring and connectors for damage and checking for faulty components.
What are the symptoms
What are the symptoms associated with the B1242 code?
- Engine Light ON: One of the main symptoms of the B1242 code is the engine light or service engine soon warning light turning on in the vehicle.
- Other symptoms may vary: Depending on the specific vehicle model, additional symptoms like problems with remote entry functions, malfunctioning key transmitters, or issues with door control may be observed.
- Can the B1242 code cause other electrical issues?: While the B1242 code is related to door control and key transmitter functions, it can potentially lead to other electrical problems in the vehicle. This may affect other systems that rely on the main body ECU or the Certification ECU.
- Is the B1242 code common in a specific vehicle make or model?: The B1242 code can occur in various vehicles and is not specific to any particular make or model. It is typically caused by issues with the door control receiver, certification ECU, or related wiring harnesses and connectors.
What are the causes
Possible causes for the B1242 code include:
- A faulty door control receiver
- Issues with the wiring harness
- Poor electrical connection in the door control receiver circuit
- A faulty Certification ECU (Smart Key ECU Assembly)
- Other potential causes not mentioned
What Tools are Needed to diagnose
To diagnose the B1242 code, you will need to use diagnostic tools. Here are some tools that can be used to diagnose Code B1242:
- OBD-II Scanner: This tool can retrieve specific trouble codes stored in the vehicle’s computer system. It helps identify the B1242 code and any related codes.
- Multimeter: A multimeter is essential for testing electrical connections and circuits associated with the Door Control Receiver and the Certification ECU. It can identify any open or shorted circuits that may be causing the code.
- Wiring Diagrams: Access to wiring diagrams is crucial for tracing circuits and identifying connections between components. It helps pinpoint any potential wiring issues.
- Technical Service Bulletins (TSBs): Checking for relevant TSBs related to the B1242 code can provide valuable information on common diagnosis mistakes and known issues with the vehicle model.
How to fix Step by Step
Step 1: Check the possible causes listed, including a faulty Door Control Receiver, open or shorted harness, poor electrical connection, or a faulty Certification ECU.
Step 2: Visually inspect the wiring harness and connectors for any damage, such as broken, bent, pushed out, or corroded pins.
Step 3: Based on your findings, perform necessary repairs or replacements.
Step 4: It is recommended to consult a professional for an accurate cost estimate, as labor rates vary.
Step 5: Ignoring the code may lead to further issues, so it is important to diagnose and address it promptly.
Step 6: By following these steps and utilizing common repair solutions, you can effectively fix the B1242 code.
What are the Common Diagnosis Mistakes
When diagnosing the B1242 code, it is important to be aware of common mistakes that can occur during the diagnostic process. Here are some common misdiagnoses for DTC B1242 and troubleshooting tips to help you avoid them:
- Misdiagnosing the Door Control Receiver: Before assuming the door control receiver is faulty, it is crucial to properly inspect and test it. Check for any problems with circuits, such as open or shorted circuits, and ensure there are no issues with electrical connections.
- Overlooking the Certification ECU: The certification ECU, also known as the smart key ECU assembly, plays a vital role in decoding signals from the electrical key transmitter. Make sure the certification ECU is functioning correctly and check for any connection issues.
- Neglecting Visual Inspections: It is essential to visually inspect the wiring harness, connectors, and components. Look for any signs of damage, such as broken or corroded pins, as these can cause communication errors.
- Skipping Necessary Repairs: Once you identify any issues during the diagnostic process, it is crucial to promptly perform the necessary repairs or replacements. Ignoring or delaying these repairs may lead to further malfunctions or issues.
What is the Repair Cost
The cost of repairing the B1242 code can vary depending on factors such as location, vehicle make and model, and additional repairs needed. Labor rates at most auto repair shops range from $75 to $150 per hour.
It is important to compare costs across different vehicle models for an accurate estimate. Consulting a professional is advised for proper diagnosis and repair.
Can I drive safely with this code?
Driving safely with the B1242 code depends on the specific symptoms. However, it is recommended to diagnose and address the code promptly to prevent further issues or malfunctions.
Consult a professional for proper diagnosis and repair to ensure safe driving and prevent further damage.
Wrapping Up: B1242 Code
The B1242 code is associated with issues in the communication system between the electrical key transmitter sub-assembly and the vehicle’s main body ECU. Ignoring this code can lead to further malfunctions, making it important to address it promptly.
Causes of the code can range from faulty Door Control Receivers to poor electrical connections. It is recommended to consult a professional for proper diagnosis and repair.