AutoCodes – Acura – P16BB Acura

P16BB Acura Code - Alternator 'B' Terminal Circuit Low Voltage

Quick Answer

The alternator is driven by the engine and generates electricity to supply the necessary power to the electrical system and to charge the battery. Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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: P16BB Acura indicates Alternator 'B' Terminal Circuit Low Voltage.
Common causes: Common causes include Faulty Alternator, Alternator harness is open or shorted, Alternator 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 12,264

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 Oct 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P16BB Acura Description

The alternator is driven by the engine and generates electricity to supply the necessary power to the electrical system and to charge the battery. The alternator voltage target values of 14.5 V and 12.5 V are achieved by switching the alternator control mode (controlled by the Powertrain Control Module (PCM)). The alternator output signal is sent to the PCM, and it varies according to the batteryís state of charge, the electrical load, and the engine speed.
When the engine speed is a specified value and the IGP terminal voltage is below a set value when the alternator is in the 14.5 V mode, and the alternator power generation amount is within the set range and this condition continues more than a set time, the PCM detects a malfunction and a Diagnostic Trouble Code (DTC) is stored.

OBDII Code P16BB Acura - Alternator 'B' Terminal Circuit Low Voltage - AutoCodes.com — P16BB Acura Code - Alternator 'B' Terminal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P16BB Acura?

Faulty Alternator
Alternator harness is open or shorted
Alternator circuit poor electrical connection

How to Fix the DTC P16BB 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 P16BB 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.

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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.