AutoCodes – Generic – P1D09

P1D09 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 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 1,448

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

What does this mean?

What are the Possible Causes of the DTC P1D09?

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?

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 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

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

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.