B1A72 RAM Code - Passive Entry Antenna 2 General Electric Failure
Quick Answer
The Passive Entry (PE) antenna units allow the transmitter within the Radio Frequency Hub (also known as the RF Hub) to communicate via Low Frequency (LF) radio transmission with a FOB with Integrated Key (FOBIK) that is located inside the vehicle or, at most, about 2 meters (6.5 feet) horizontally in all directions around the outside of the vehicle. Common causes include Faulty Passive Entry Antenna 2, Passive Entry Antenna 2 harness is open or shorted, Passive Entry Antenna 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1A72 RAM indicates Passive Entry Antenna 2 General Electric Failure.
- Common causes
- Common causes include Faulty Passive Entry Antenna 2, Passive Entry Antenna 2 harness is open or shorted, Passive Entry Antenna 2 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1A72 RAM Description
Each antenna unit has two dedicated connections to the RF Hub. One connection is the LF antenna output circuit, while the other connection Is the LF antenna return circuit. These circuits to each antenna unit are a twisted pair to help reduce the potential for induced electrical interference. The RF Hub microcontroller monitors all of the antenna units and will store a Diagnostic Trouble Code (DTC) for any fault that it detects.
The hard wired inputs and outputs of the antenna units may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, the most reliable, efficient, and accurate means to diagnose the antenna units requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
What are the Possible Causes of the DTC B1A72 RAM?
- Faulty Passive Entry Antenna 2
- Passive Entry Antenna 2 harness is open or shorted
- Passive Entry Antenna 2 circuit poor electrical connection
- Faulty Passive Entry Module (PEM)
- Faulty Radio Frequency Hub (RF Hub) Module
How to Fix the DTC B1A72 RAM?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B1A72-11 PASSIVE ENTRY ANTENNA 2 CIRCUIT SHORT TO GROUND
B1A72-12 PASSIVE ENTRY ANTENNA 2 CIRCUIT SHORT TO BATTERY
B1A72-13 PASSIVE ENTRY ANTENNA 2 CIRCUIT OPEN
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1A72 RAM code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B1A72 RAM Code
1. What does OBDII code B1A72 mean?
The B1A72 code indicates a "Passive Entry Antenna 2 General Electric Failure," meaning there is an issue with the second passive entry antenna in the keyless entry system.
2. What are the common symptoms of code B1A72?
Common symptoms include the keyless entry system not working properly, difficulty locking/unlocking the doors, or a warning light on the dashboard.
3. What causes the B1A72 code to appear?
The code is typically caused by a faulty passive entry antenna, damaged wiring, poor electrical connections, or a malfunction in the keyless entry module.
4. Can I still drive my vehicle with the B1A72 code?
Yes, the vehicle is still drivable, but the keyless entry system may not function as expected, potentially causing inconvenience.
5. How is the B1A72 code diagnosed?
A technician will use a scan tool to confirm the code, visually inspect the antenna and wiring, and test the circuit for proper voltage and continuity.
6. How can I fix the B1A72 code?
Repairs may involve replacing the faulty passive entry antenna, repairing damaged wires, or cleaning/repairing corroded electrical connections.
7. How much does it cost to fix the B1A72 code?
The repair cost can range from $100 to $400, depending on whether the antenna needs replacement or if only wiring repairs are required.
8. Can I fix the B1A72 code myself?
If you're experienced with automotive electrical systems, you may be able to inspect and repair damaged wiring or replace the antenna. Otherwise, professional assistance is recommended.
9. What tools are needed to fix code B1A72?
Common tools include a multimeter for testing voltage and continuity, basic hand tools, and potentially a scan tool to clear the code after repairs.
10. Will clearing the B1A72 code solve the problem?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to reappear. Proper diagnosis and repair are necessary.
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