AutoCodes – Honda – P0641 Honda

P0641 Honda Code - Sensor Reference Voltage 'A' Malfunction

Quick Answer

The Powertrain Control Module (PCM) is equipped with a voltage monitor (5 V power source) to supply a stable 5 V to each sensor as a reference voltage. Common causes include Manifold Absolute Pressure (MAP) sensor VCC line short to power, Fuel rail pressure sensor VCC line short to power, Crankshaft Position (CKP) sensor VCC line short to power. 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: P0641 Honda indicates Sensor Reference Voltage 'A' Malfunction.
Common causes: Common causes include Manifold Absolute Pressure (MAP) sensor VCC line short to power, Fuel rail pressure sensor VCC line short to power, Crankshaft Position (CKP) sensor VCC line short to power.
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 26,636

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 Jan 05, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0641 Honda Description

The Powertrain Control Module (PCM) is equipped with a voltage monitor (5 V power source) to supply a stable 5 V to each sensor as a reference voltage. The correct voltage for the sensors are loaded in the Central Processing Unit (CPU) of the PCM (A/D input) and when the sensor power voltage is a set value (high or low) for a certain time, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0641 Honda - Sensor Reference Voltage 'A' Malfunction - AutoCodes.com — P0641 Honda Code - Sensor Reference Voltage 'A' Malfunction

What does this mean?

What are the Possible Causes of the DTC P0641 Honda?

Manifold Absolute Pressure (MAP) sensor VCC line short to power
Fuel rail pressure sensor VCC line short to power
Crankshaft Position (CKP) sensor VCC line short to power
Throttle body VCC line short to power
Accelerator Pedal Position (APP) sensor VCC line short to power
MAP sensor VCC line short to ground
Fuel rail pressure sensor VCC line short to ground
CKP sensor VCC line short to ground
Throttle body VCC line short to ground
APP sensor A/B VCC line short to ground
PCM internal circuit failure

How to Fix the DTC P0641 Honda?

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 P0641 Honda 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 Honda Models

P0641 2016 Honda CR-V — Sensor Reference Voltage 'A' Malfunction
P0641 2017 Honda CR-V — Sensor Reference Voltage 'A' Malfunction
P0641 2018 Honda CR-V — Sensor Reference Voltage 'A' Malfunction
P0641 2019 Honda CR-V — Sensor Reference Voltage 'A' Malfunction
P0641 2020 Honda CR-V — Sensor Reference Voltage 'A' Malfunction
P0641 2021 Honda CR-V — Sensor Reference Voltage 'A' Malfunction

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.