B1A71 Code - Passive Entry Antenna 1 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 1, Passive Entry Antenna 1 harness is open or shorted, Passive Entry Antenna 1 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
- B1A71 indicates Passive Entry Antenna 1 General Electric Failure.
- Common causes
- Common causes include Faulty Passive Entry Antenna 1, Passive Entry Antenna 1 harness is open or shorted, Passive Entry Antenna 1 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 B1A71 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 B1A71?
- Faulty Passive Entry Antenna 1
- Passive Entry Antenna 1 harness is open or shorted
- Passive Entry Antenna 1 circuit poor electrical connection
- Faulty Passive Entry Module (PEM)
- Faulty Radio Frequency Hub (RF Hub) Module
How to Fix the DTC B1A71?
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
B1A71-11 PASSIVE ENTRY ANTENNA 1 CIRCUIT SHORT TO GROUND
B1A71-12 PASSIVE ENTRY ANTENNA 1 CIRCUIT SHORT TO BATTERY
B1A71-13 PASSIVE ENTRY ANTENNA 1 CIRCUIT OPEN
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1A71 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
- B1A71 Chrysler — Passive Entry Antenna 1 General Electric Failure
- B1A71 Dodge — Passive Entry Antenna 1 General Electric Failure
- B1A71 Jeep — Passive Entry Antenna 1 General Electric Failure
- B1A71 RAM — Passive Entry Antenna 1 General Electric Failure
Frequently Asked Questions about B1A71 Code
1. What does the OBDII code B1A71 mean?
The B1A71 code indicates a general electrical failure in Passive Entry Antenna 1, which is part of the keyless entry system.
2. What are the common symptoms of the B1A71 code?
Symptoms include difficulty unlocking or locking the vehicle using the keyless entry system, failure of the push-to-start feature, or a key fob not being detected.
3. What causes the B1A71 code to appear?
Common causes include a damaged passive entry antenna, wiring or connector issues, key fob battery failure, or a malfunction in the keyless entry control module.
4. How do you diagnose the B1A71 code?
Diagnosis involves scanning for codes, visually inspecting the antenna and wiring, testing for continuity in the circuit, and checking for proper operation of the key fob and control module.
5. Can a weak key fob battery cause the B1A71 code?
Yes, a weak or dead key fob battery can cause communication issues, potentially triggering this code.
6. How do you fix the B1A71 code?
Repairs may include replacing the faulty antenna, repairing damaged wiring or connectors, replacing the key fob battery, or reprogramming the keyless entry system.
7. Is it safe to drive with the B1A71 code?
While the vehicle may still be drivable, keyless entry and push-to-start features might not work, which can be inconvenient and potentially problematic in emergencies.
8. How much does it cost to repair the B1A71 code?
The cost varies depending on the specific issue. Replacing a passive entry antenna typically costs $100–$300, while wiring repairs or key fob fixes may cost less.
9. Can the B1A71 code reset itself?
In rare cases, resolving a temporary issue like a weak key fob battery might clear the code, but most instances require manual clearing after repairs.
10. How can I prevent the B1A71 code from occurring?
Regularly inspect the key fob battery, avoid physical damage to the vehicle’s antennas or wiring, and ensure your keyless entry system is maintained according to the manufacturer’s recommendations.
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