B1A74 Chrysler Code - Passive Entry Antenna 4 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 4, Passive Entry Antenna 4 harness is open or shorted, Passive Entry Antenna 4 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
- B1A74 Chrysler indicates Passive Entry Antenna 4 General Electric Failure.
- Common causes
- Common causes include Faulty Passive Entry Antenna 4, Passive Entry Antenna 4 harness is open or shorted, Passive Entry Antenna 4 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 B1A74 Chrysler 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 B1A74 Chrysler?
- Faulty Passive Entry Antenna 4
- Passive Entry Antenna 4 harness is open or shorted
- Passive Entry Antenna 4 circuit poor electrical connection
- Faulty Passive Entry Module (PEM)
- Faulty Radio Frequency Hub (RF Hub) Module
How to Fix the DTC B1A74 Chrysler?
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
B1A74-11 PASSIVE ENTRY ANTENNA 4 CIRCUIT SHORT TO GROUND
B1A74-12 PASSIVE ENTRY ANTENNA 4 CIRCUIT SHORT TO BATTERY
B1A74-13 PASSIVE ENTRY ANTENNA 4 CIRCUIT OPEN
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1A74 Chrysler 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 B1A74 Chrysler Code
1. What does the OBDII code B1A74 mean on a Chrysler vehicle?
The B1A74 code indicates a "Passive Entry Antenna 4 General Electric Failure," meaning there’s an issue with the passive entry system's antenna or its wiring.
2. What are the symptoms of the B1A74 code?
Common symptoms include the keyless entry system not working, difficulty locking or unlocking doors, or intermittent operation of the passive entry feature.
3. What causes the B1A74 code to appear?
Possible causes include a damaged or faulty passive entry antenna, wiring issues like short circuits or corrosion, or a malfunctioning Body Control Module (BCM).
4. How can I diagnose the B1A74 code?
Diagnosing involves using a scan tool to confirm the code, visually inspecting the antenna and wiring for damage, and testing the antenna's electrical connections for continuity or short circuits.
5. Can I still drive my Chrysler with the B1A74 code active?
Yes, the vehicle is still drivable, but the passive entry system may not function properly, requiring manual key operation for locking and unlocking.
6. How is the B1A74 code fixed?
Repairs typically involve replacing the faulty passive entry antenna, repairing damaged wiring, or, in rare cases, reprogramming or replacing the BCM.
7. Where is Passive Entry Antenna 4 located in a Chrysler vehicle?
The exact location varies by model, but Passive Entry Antenna 4 is usually located near the rear of the vehicle, such as in the trunk or rear bumper area.
8. How much does it cost to fix the B1A74 code?
Repair costs depend on the issue but typically range from $150 to $400, including parts and labor, if the antenna or wiring needs replacement.
9. Can a weak key fob battery trigger the B1A74 code?
No, a weak key fob battery won’t trigger this code, but it may cause passive entry issues. The B1A74 code specifically points to an antenna issue.
10. Do I need to reprogram the key fob after fixing the B1A74 code?
No, reprogramming the key fob is generally not required after repairing the antenna or associated wiring unless the BCM was replaced.
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