AutoCodes – Generic – P16D4

P16D4 Code - Battery Monitor Module Circuit Low Voltage

Quick Answer

The vehicle control module monitors the system voltage, current, and internal temperature to verify they are within the normal operating range. Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery 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: P16D4 indicates Battery Monitor Module Circuit Low Voltage.
Common causes: Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery 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 6,126

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16D4 Description

The vehicle control module monitors the system voltage, current, and internal temperature to verify they are within the normal operating range. It also monitors ROM or RAM memory faults, and performs other internal diagnostics.

OBDII Code P16D4 - Battery Monitor Module Circuit Low Voltage - AutoCodes.com — P16D4 Code - Battery Monitor Module Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P16D4?

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

How to Fix the DTC P16D4?

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 P16D4 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 P16D4 code?

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Need Help with the Code?

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Information for Specific Makes

P16D4 Buick — Battery Monitor Module Circuit Low Voltage
P16D4 Cadillac — Battery Monitor Module Circuit Low Voltage
P16D4 Chevrolet — Battery Monitor Module Circuit Low Voltage
P16D4 GMC — Battery Monitor Module Circuit Low Voltage

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 P16D4 Code

1. What are the common symptoms of OBDII code P16D4 (Battery Monitor Module Circuit Low Voltage)?

Symptoms may include a weak or dead battery, dimming headlights, difficulty starting the vehicle, and issues with electrical components.

2. What are the potential causes of OBDII code P16D4?

Causes may include a faulty battery monitor module, damaged electrical wiring, a weak battery, or issues with the charging system.

3. How can I diagnose the reason behind OBDII code P16D4?

Diagnosis typically involves checking the battery voltage, inspecting the battery monitor module and related wiring, testing the charging system, and scanning for any other related trouble codes.

4. Is it safe to continue driving with OBDII code P16D4 present?

It is not recommended to drive with this code active, as it can lead to further electrical issues and potential breakdowns due to a compromised battery system.

5. How can I repair OBDII code P16D4?

Repairs may involve replacing the battery monitor module, repairing or replacing damaged wiring, testing and potentially replacing the battery, and ensuring the charging system is functioning properly.

6. Can a DIY enthusiast fix OBDII code P16D4 at home?

While some basic troubleshooting steps can be performed at home, diagnosing and repairing this code may require advanced tools and expertise, so it is advisable to seek professional help.

7. Will resetting the trouble code make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing OBDII code P16D4 is not addressed, the code is likely to return.

8. How long does it typically take to repair OBDII code P16D4?

The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and repair the problem properly.

9. Can a weak battery cause OBDII code P16D4 to appear?

Yes, a weak or failing battery can trigger this code due to the low voltage levels affecting the battery monitor module's operation.

10. Is it necessary to visit a dealership for OBDII code P16D4 repairs?

While a dealership can provide specialized expertise, independent auto repair shops with experience in electrical systems can also effectively diagnose and repair OBDII code P16D4.