AutoCodes – Generic – P163B

P163B Code - Secondary Generator Control Circuit Range/Performance

Quick Answer

With the engine running, the charging system warning indicator is off. Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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: P163B indicates Secondary Generator Control Circuit Range/Performance.
Common causes: Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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 11,739

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 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P163B Description

With the engine running, the charging system warning indicator is off. The circuit from the battery B+ to the generator regulator is 13-15 volts. This voltage feedback is used by the regulator to maintain the battery voltage at the desired set-point. The S (stator) circuit (internal to the generator) is used to monitor generator operation. This circuit and other regulator internal conditions are checked by the regulator to allow the PCM to turn off the charging system warning indicator by sending a message over the Controller Area Network (CAN) bus to the Instrument Cluster (IC). The positive battery output (B+) circuit is the generator output supplied to the battery and electrical system. For dual generator systems, these circuits are duplicated. Both generator regulators send a signal to the Powertrain Control Module (PCM) to allow the PCM to turn off the charging system warning indicator. In dual generator systems, the PCM keeps the secondary generator in a standby state where it does not generate current unless the primary generator is generating full power and more current is needed to support the vehicle loads. This may make it appear that the secondary generator is not working when vehicle loads are not large. It is important to note that a normal operational state of the charging system is for the secondary generator to not produce current.

OBDII Code P163B - Secondary Generator Control Circuit Range/Performance - AutoCodes.com — P163B Code - Secondary Generator Control Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P163B?

Faulty Generator (Alternator)
Generator harness is open or shorted
Generator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P163B?

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 P163B 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 P163B code?

Need more information on how to fix the P163B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P163B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P163B Buick — Control Module Fuel Pressure Regulator 2 Control System Circuitry Performance
P163B Cadillac — Control Module Fuel Pressure Regulator 2 Control System Circuitry Performance
P163B Chevrolet — Control Module Fuel Pressure Regulator 2 Control System Circuitry Performance
P163B Ford — Secondary Generator Control Circuit Range/Performance
P163B GMC — Control Module Fuel Pressure Regulator 2 Control System Circuitry Performance
P163B Lincoln — Secondary Generator Control Circuit Range/Performance
P163B Mercury — Secondary Generator Control Circuit Range/Performance

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 P163B Code

1. What are the common symptoms of OBDII code P163B (Secondary Generator Control Circuit Range/Performance)?

The common symptoms of code P163B may include issues with the vehicle's charging system, such as dimming lights, difficulty starting the engine, or a dashboard warning light indicating a problem.

2. What are the possible causes of OBDII code P163B?

Possible causes of code P163B include a faulty generator control module, damaged wiring or connectors in the secondary generator circuit, or issues with the generator itself.

3. How can I diagnose OBDII code P163B?

Diagnosing code P163B typically involves using a scan tool to read the code and perform further testing on the generator control circuit, wiring, and components to identify the root cause of the issue.

4. Can I continue driving my vehicle with OBDII code P163B?

It is not recommended to drive your vehicle with an unresolved P163B code, as it could lead to further damage to the charging system and potentially leave you stranded due to a dead battery.

5. How can I repair OBDII code P163B?

Repairing code P163B may involve replacing the faulty generator control module, repairing damaged wiring or connectors, or addressing any issues with the generator itself. It's best to follow a systematic diagnostic approach to ensure a proper repair.

6. Are there any DIY tips for fixing OBDII code P163B?

While some basic troubleshooting steps can be done by DIY enthusiasts, resolving code P163B may require specialized tools and expertise. It's recommended to consult a professional mechanic for an accurate diagnosis and repair.

7. How much does it cost to fix OBDII code P163B?

The cost of fixing code P163B can vary depending on the root cause of the issue, the make and model of your vehicle, and labor rates in your area. It's best to obtain quotes from local repair shops for an accurate estimate.

8. Can a bad battery trigger OBDII code P163B?

A bad battery can contribute to charging system issues that may trigger code P163B. It's important to ensure the battery is in good condition and properly connected before diagnosing the specific cause of the code.

9. Is OBDII code P163B specific to certain vehicle makes and models?

While code P163B is related to the secondary generator control circuit, it can be found in various vehicle makes and models equipped with OBDII systems. Consult your vehicle's service manual for specific details.

10. How can regular maintenance help prevent OBDII code P163B from occurring?

Regular maintenance of your vehicle's charging system, including checking the battery, generator, and related components, can help prevent issues that may trigger code P163B. Follow the manufacturer's recommended maintenance schedule to keep your vehicle in optimal condition.