AutoCodes – Acura – P1D09 Acura

P1D09 Acura Code - EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module

Quick Answer

The battery control processor is in the battery condition monitor module. Common causes include Faulty Battery Condition Monitor Module, Battery Condition Monitor Module harness is open or shorted, Battery Condition Monitor Module 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: P1D09 Acura indicates EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module.
Common causes: Common causes include Faulty Battery Condition Monitor Module, Battery Condition Monitor Module harness is open or shorted, Battery Condition Monitor Module 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.

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Code Popularity 1,346

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 Apr 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1D09 Acura Description

The battery control processor is in the battery condition monitor module. The controller area network (CAN) transmits/ receives pulsing signals to/from the battery voltage cell voltage sensor simultaneously by using two signal lines (BATT-CAN_H and BATT-CAN_L). When the processor does not receive the signals via the BAT-CAN lines for a set time, a malfunction is detected and a DTC is stored.

OBDII Code P1D09 Acura - EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module - AutoCodes.com — P1D09 Acura Code - EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module

What does this mean?

What are the Possible Causes of the DTC P1D09 Acura?

Faulty Battery Condition Monitor Module
Battery Condition Monitor Module harness is open or shorted
Battery Condition Monitor Module circuit poor electrical connection

How to Fix the DTC P1D09 Acura?

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 P1D09 Acura 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.

Need more information about the P1D09 Acura code?

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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 P1D09 Acura Code

1. What does the OBDII code P1D09 mean on an Acura?

P1D09 indicates an "EP-CAN A Malfunction BUS-OFF" issue related to the Battery Condition Monitor Module, signaling a communication fault on the EP-CAN (Electric Powertrain Controller Area Network) bus.

2. What are the common symptoms of the P1D09 code on an Acura?

Common symptoms include the check engine light turning on, possible hybrid system warnings, reduced vehicle performance, and issues with battery monitoring or charging systems.

3. What causes the P1D09 code to appear on an Acura?

The code can be caused by faulty wiring or connectors in the EP-CAN bus, a malfunctioning Battery Condition Monitor Module, or a short or open circuit in the communication lines.

4. Can a weak battery trigger the P1D09 code on an Acura?

Yes, a weak or failing 12V battery can disrupt communication in the EP-CAN network, potentially causing this code to appear.

5. How do I diagnose the P1D09 code on my Acura?

Diagnosis involves checking the EP-CAN bus wiring and connectors for damage, testing the Battery Condition Monitor Module, and ensuring the 12V battery and charging systems are functioning properly.

6. Can I drive my Acura with the P1D09 code active?

Itâ€™s not recommended to drive with the P1D09 code active for extended periods, as it may indicate issues with critical systems like the battery or hybrid functions.

7. How do I fix the P1D09 code on an Acura?

Repairs may involve fixing or replacing damaged wiring or connectors, replacing the Battery Condition Monitor Module, or addressing issues with the 12V battery or alternator.

8. Will clearing the P1D09 code solve the problem permanently?

Clearing the code may turn off the warning temporarily, but the underlying issue must be resolved to prevent the code from returning.

9. How much does it cost to fix the P1D09 code on an Acura?

Repair costs vary depending on the cause, ranging from $100 for minor wiring repairs to $500 or more if the Battery Condition Monitor Module needs replacement.

10. Can a software update fix the P1D09 code on an Acura?

In some cases, a software update to the vehicleâ€™s control modules may resolve communication issues, but this typically depends on the specific circumstances and diagnosis.