AutoCodes – GMC – P16D5 GMC

P16D5 GMC Code - Battery Monitor Module Circuit High 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: P16D5 GMC indicates Battery Monitor Module Circuit High 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 966

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 P16D5 GMC 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 P16D5 GMC - Battery Monitor Module Circuit High Voltage - AutoCodes.com — P16D5 GMC Code - Battery Monitor Module Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P16D5 GMC?

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

How to Fix the DTC P16D5 GMC?

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 P16D5 GMC 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 P16D5 GMC 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 P16D5 GMC Code

1. What does the OBDII code P16D5 mean on a GMC?

P16D5 indicates a problem with the Battery Monitor Module (BMM) circuit detecting a high voltage condition, which may affect battery management and charging system performance.

2. What are the common symptoms of a P16D5 code on a GMC vehicle?

Symptoms may include an illuminated check engine light, erratic charging system behavior, battery drain, or issues with start-stop functionality.

3. What causes the P16D5 code to trigger on a GMC?

Common causes include a faulty battery monitor module, damaged wiring or connectors in the circuit, a defective battery, or charging system issues.

4. Can a weak or failing battery cause the P16D5 code on a GMC?

Yes, a weak or failing battery can trigger this code if it affects the voltage monitored by the Battery Monitor Module.

5. How do you diagnose a P16D5 code on a GMC?

Diagnose by inspecting the battery, wiring, and connectors for damage, testing the battery monitor module, and using a multimeter to check for proper voltage levels in the circuit.

6. Is it safe to drive a GMC vehicle with a P16D5 code?

Driving may be possible, but itâ€™s not recommended as it could lead to battery or charging system failure, leaving you stranded.

7. How can I fix the P16D5 code on my GMC?

Fixes may include repairing or replacing damaged wiring, cleaning corroded connectors, replacing the battery monitor module, or addressing battery and alternator issues.

8. How much does it cost to repair the P16D5 code on a GMC?

Repair costs vary but may range from $100 to $500, depending on whether the issue is wiring-related, battery-related, or requires a new battery monitor module.

9. Can a software update fix the P16D5 code on a GMC?

In some cases, a software update to the vehicleâ€™s ECU or charging system may resolve the issue if it stems from a programming error.

10. Do I need a professional mechanic to fix the P16D5 code on my GMC?

While basic checks like inspecting the battery and connectors can be done at home, diagnosing and repairing the battery monitor module or circuit often requires professional tools and expertise.