AutoCodes – Generic – P163A

P163A Code - Secondary Generator Control Circuit

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: P163A indicates Secondary Generator Control Circuit.
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 11,095

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 Aug 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P163A 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 P163A - Secondary Generator Control Circuit - AutoCodes.com — P163A Code - Secondary Generator Control Circuit

What does this mean?

What are the Possible Causes of the DTC P163A?

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

How to Fix the DTC P163A?

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 P163A 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 P163A code?

Need more information on how to fix the P163A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P163A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P163A Buick — Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance
P163A Cadillac — Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance
P163A Chevrolet — Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance
P163A Ford — Secondary Generator Control Circuit
P163A GMC — Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance
P163A Lincoln — Secondary Generator Control Circuit
P163A Mercury — Secondary Generator Control Circuit

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 P163A Code

1. What are common symptoms of OBDII code P163A (Secondary Generator Control Circuit)?

- Common symptoms include the illumination of the Check Engine Light, charging system malfunctions, and issues with the vehicle's battery.

2. What are the possible causes of OBDII code P163A?

- The code P163A can be triggered by a faulty secondary generator control module, damaged wiring or connectors in the control circuit, or a failing generator.

3. How can I diagnose the cause of OBDII code P163A?

- Diagnosing the code typically involves using a scan tool to retrieve the trouble codes, testing the secondary generator control module, inspecting wiring for damage, and checking the generator's operation.

4. Is it safe to continue driving with OBDII code P163A present?

- It is not recommended to continue driving with OBDII code P163A, as it can lead to a failing charging system, potential battery drain, and ultimately result in the vehicle stalling.

5. Can I repair OBDII code P163A myself?

- While some DIY enthusiasts may attempt to troubleshoot and repair the issue, it is recommended to consult with a professional mechanic due to the complexity of diagnosing and fixing problems related to the secondary generator control circuit.

6. How much does it typically cost to repair OBDII code P163A?

- The cost of repair for OBDII code P163A can vary depending on the exact cause of the issue, but it may involve replacing the secondary generator control module, repairing damaged wiring, or replacing the generator. Costs can range from a few hundred to over a thousand dollars.

7. Can a weak battery cause OBDII code P163A to appear?

- Yes, a weak or failing battery can contribute to the appearance of OBDII code P163A as it can put additional stress on the charging system, leading to malfunctions in the secondary generator control circuit.

8. Are there any preventive measures to avoid OBDII code P163A in the future?

- Regular maintenance of the vehicle's charging system, including checking the battery's health, inspecting wiring for damage, and ensuring the generator is functioning properly, can help prevent the recurrence of OBDII code P163A.

9. How urgent is it to address OBDII code P163A once it appears?

- It is recommended to address OBDII code P163A as soon as possible to prevent further damage to the vehicle's charging system, avoid potential stalling, and ensure the overall reliability of the vehicle.

10. Can OBDII code P163A be intermittent or persistent?

- OBDII code P163A can manifest as either intermittent or persistent, with intermittent occurrences often indicating loose connections or intermittent faults, while persistent occurrences may point to more serious issues requiring immediate attention.