What causes B1601 on a Honda?

Faulty keyless access control unit Keyless access control unit harness is open or shorted Keyless access control unit circuit poor electrical connection Low battery voltage affecting the keyless unit Water intrusion or corrosion at the keyless unit

How do I fix B1601 on a Honda?

Confirm the code with a scan tool and check all keyless access functions Inspect the keyless access unit connectors for corrosion, moisture, and loose pins Test battery voltage and charging to rule out low voltage Check around the unit for water intrusion Replace the keyless access control unit only after tests prove it failed

B1601 The keyless access control unit reported a CPU error

Q: What does B1601 mean on a Honda?

B1601. The keyless access control unit reported a CPU error. Push button start and keyless entry may stop working or act intermittently. Applies to Honda and Acura models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Honda and Acura models that use this code

What does B1601 mean on a Honda?

B1601. The keyless access control unit reported a CPU error. Push button start and keyless entry may stop working or act intermittently. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1601

Faulty keyless access control unit
Keyless access control unit harness is open or shorted
Keyless access control unit circuit poor electrical connection
Low battery voltage affecting the keyless unit
Water intrusion or corrosion at the keyless unit

How to fix B1601

Confirm the code with a scan tool and check all keyless access functions
Inspect the keyless access unit connectors for corrosion, moisture, and loose pins
Test battery voltage and charging to rule out low voltage
Check around the unit for water intrusion
Replace the keyless access control unit only after tests prove it failed

Sources and review

Last updated 2026-09-29.