B1A72 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 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 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?
- 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?
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 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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Information for Specific Makes
- B1A72 Chrysler — Passive Entry Antenna 2 General Electric Failure
- B1A72 Dodge — Passive Entry Antenna 2 General Electric Failure
- B1A72 Jeep — Passive Entry Antenna 2 General Electric Failure
- B1A72 RAM — Passive Entry Antenna 2 General Electric Failure
Frequently Asked Questions about B1A72 Code
1. What are common symptoms of OBDII code B1A72 - Passive Entry Antenna 2 General Electric Failure?
- Common symptoms include issues with the passive entry system, such as difficulty unlocking or locking the vehicle using the key fob, or sporadic operation of the system.
2. What are possible causes of OBDII code B1A72?
- Possible causes of this code include a faulty passive entry antenna, damaged wiring or connectors related to the antenna, or a malfunction in the general electric system.
3. How can I diagnose the issue related to OBDII code B1A72?
- The issue can be diagnosed by performing a thorough visual inspection of the passive entry antenna, wiring, and connectors. Additionally, using a diagnostic scanner to read and interpret the code can help pinpoint the exact problem.
4. Is it safe to continue driving with OBDII code B1A72 present?
- While the vehicle may still be operable with this code present, it is recommended to address the issue promptly to ensure the proper functioning of the passive entry system and avoid potential inconvenience or security risks.
5. Can I repair OBDII code B1A72 on my own?
- Depending on your level of automotive expertise, you may be able to address the issue on your own by replacing the faulty passive entry antenna or repairing any damaged wiring or connectors. However, professional assistance may be required for more complex repairs.
6. Are there any temporary fixes for OBDII code B1A72?
- In some cases, resetting the vehicle's computer system by disconnecting the battery for a few minutes may temporarily clear the code. However, it is important to investigate and address the underlying issue to prevent the code from reoccurring.
7. How much does it typically cost to repair OBDII code B1A72?
- The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the damage, and whether professional labor is required. It is advisable to obtain quotes from local automotive service centers for an accurate estimate.
8. Can weather conditions affect the operation of the passive entry antenna related to OBDII code B1A72?
- Yes, extreme weather conditions such as heavy rain or snow can potentially impact the operation of the passive entry antenna, leading to intermittent failures or malfunctions. Ensuring the components are properly sealed and protected can help mitigate weather-related issues.
9. Will OBDII code B1A72 cause my vehicle to fail an emissions test?
- OBDII code B1A72 is related to the passive entry system and is not directly linked to emissions. However, it is important to address the issue to ensure all vehicle systems are functioning properly and to prevent any potential issues during emissions testing.
10. How long does it take to repair OBDII code B1A72?
- The repair time for OBDII code B1A72 can vary depending on the complexity of the issue and the availability of parts. Simple repairs such as replacing a faulty antenna may be completed within a few hours, while more extensive repairs could take longer.
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