AutoCodes – Generic – B1A35

B1A35 Code - Unidentified Key Communication Error

Quick Answer

Whenever a Fob-Integrated-Key (FOBIK) is inserted in the Wireless Ignition Node (WIN) basestation, the WIN performs a self test and resynchronization routine. Common causes include Faulty Fob-Integrated-Key (FOBIK), Faulty Wireless Ignition Node (WIN). 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: B1A35 indicates Unidentified Key Communication Error.
Common causes: Common causes include Faulty Fob-Integrated-Key (FOBIK), Faulty Wireless Ignition Node (WIN).
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.

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Code Popularity 6,304

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1A35 Description

Whenever a Fob-Integrated-Key (FOBIK) is inserted in the Wireless Ignition Node (WIN) basestation, the WIN performs a self test and resynchronization routine. During the routine, the WIN interrogates the FOBIK, performing various validity and performance tests. The repair of this fault condition relies on whether the FOBIK ID is received by the WIN. During interrogation, the FOBIK sends an LF (Low frequency) signal to the WIN that includes the programmed FOBIK ID.
This Diagnostic Trouble Code (DTC) sets if a FOBIK is inserted in the WIN basestation but the WIN does not receive or is unable to read an ID from the FOBIK. This DTC will remain active until a valid programmed FOBIK is inserted in the WIN and its ID is received.

OBDII Code B1A35 - Unidentified Key Communication Error - AutoCodes.com — B1A35 Code - Unidentified Key Communication Error

What does this mean?

What are the Possible Causes of the DTC B1A35?

Faulty Fob-Integrated-Key (FOBIK)
Faulty Wireless Ignition Node (WIN)

How to Fix the DTC B1A35?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1A35 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

B1A35 Chrysler — Unidentified Key Communication Error
B1A35 Dodge — Unidentified Key Communication Error
B1A35 Jeep — Unidentified Key Communication Error
B1A35 RAM — Unidentified Key Communication Error

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1A35 Code

1. What are the common symptoms of OBDII code B1A35 (Unidentified Key Communication Error)?

- Common symptoms include issues with starting the vehicle, key fob not working properly, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B1A35?

- Possible causes include a faulty key fob, issues with the immobilizer system, wiring problems, or a problem with the vehicle's computer system.

3. How can I diagnose the source of the Unidentified Key Communication Error?

- Diagnosis involves checking the key fob battery, ensuring the key fob is properly programmed, inspecting the wiring connections, and using a diagnostic scanner to read the codes.

4. Can I repair the Unidentified Key Communication Error myself?

- Depending on the cause, you may be able to reset the key fob, replace the key fob battery, or check and repair wiring connections. However, if the issue is more complex, professional help may be required.

5. Is it safe to drive the vehicle with OBDII code B1A35 present?

- It is not recommended to drive the vehicle with this error code present, as it may lead to starting issues or potential immobilization of the vehicle.

6. How much does it typically cost to repair OBDII code B1A35?

- The cost of repair can vary depending on the underlying cause. Simple fixes like replacing a key fob battery may be relatively inexpensive, while more complex issues could lead to higher repair costs.

7. Can a car key replacement fix the Unidentified Key Communication Error?

- In some cases, a car key replacement may resolve the issue if the problem lies with the key itself. However, it is important to diagnose the exact cause of the error before proceeding with a replacement.

8. Will resetting the vehicle's computer system clear the B1A35 error code?

- Resetting the computer system may temporarily clear the error code, but if the underlying issue is not addressed, the code is likely to reappear. Proper diagnosis and repair are recommended.

9. Are there any preventive measures to avoid OBDII code B1A35 in the future?

- Regularly checking the key fob battery, ensuring proper key fob programming, and addressing any wiring issues promptly can help prevent the recurrence of this error code.

10. Can a locksmith help with resolving the Unidentified Key Communication Error?

- A locksmith may be able to assist with key fob programming or replacement, but for diagnosing and repairing complex electronic issues, it is recommended to consult a qualified automotive technician.