AutoCodes – Generic – P1D03

P1D03 Code - All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control 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: P1D03 indicates All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control 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 8,235

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 P1D03 Description

The battery control processor is in the battery condition monitor module. The controller area network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN A_H and F-CAN A_L) and (EPP-CAN_H and EPP-CAN_L). The F-CAN and the EPP-CAN sends same data. If the F-CAN or the EPP-CAN does not transmit/receive data, the normal signal line can transmit/receive data. If the F-CAN and the EPP-CAN does not transmit/receive data, the battery condition monitor module cannot run normally. The battery condition monitor module detects no signal, received data is abnormal or BUS-OFF is received via the F-CAN and EPP-CAN, the battery condition monitor module detects a malfunction and stores a DTC.

OBDII Code P1D03 - All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control Module - AutoCodes.com — P1D03 Code - All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control Module

What does this mean?

What are the Possible Causes of the DTC P1D03?

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 P1D03?

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 P1D03 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

P1D03 Acura — All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control Module
P1D03 Honda — All CAN Malfunction Battery Condition Monitor Module - Generator Motor Control 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.

Frequently Asked Questions about P1D03 Code

What does the OBDII code P1D03 mean?

The code P1D03 indicates a communication malfunction on the Controller Area Network (CAN) between the Battery Condition Monitor Module (BCMM) and the Generator Motor Control Module (GMCM).

What are the symptoms of the P1D03 code?

Common symptoms include illuminated warning lights (like the check engine light), reduced hybrid system performance, and possible issues with battery charging or discharging.

What causes the P1D03 code to appear?

The code is typically caused by faulty wiring or connections in the CAN network, a malfunctioning BCMM or GMCM, or interference in the communication signals.

Can a weak battery cause the P1D03 code?

Yes, a weak or failing 12-volt battery can lead to communication errors on the CAN bus and trigger the P1D03 code.

How can I diagnose the P1D03 code?

Start by inspecting the wiring and connectors between the BCMM and GMCM for damage or corrosion, check the 12-volt battery health, and use a scan tool to monitor CAN communication.

Can I drive my car with the P1D03 code?

Itâ€™s not recommended to drive with this code for an extended period, as it can affect hybrid system performance and potentially lead to further damage.

How do I fix the P1D03 code?

Repairs may include fixing or replacing damaged wiring, cleaning or reconnecting connectors, replacing a faulty BCMM or GMCM, or addressing any battery-related issues.

Is the P1D03 code specific to hybrid or electric vehicles?

Yes, this code is typically found in hybrid or electric vehicles where communication between battery and motor control modules is critical.

What tools are needed to fix the P1D03 code?

Youâ€™ll need a scan tool capable of reading manufacturer-specific codes, a multimeter for testing wiring and connections, and potentially a battery tester for checking the 12-volt system.

How much does it cost to repair the P1D03 code?

Repair costs can vary widely, ranging from $100 to $1,000, depending on whether you need to fix wiring, replace a module, or address battery-related issues.