AutoCodes – Cadillac – P1A8A Cadillac

P1A8A Cadillac Code - 42 Volt System Voltage High

Quick Answer

The Accessory Power Module (APM) supplies the energy that flows between the high voltage, 300 volt, direct current (DC) and intermediate voltage, 42 volt, DC to support the Electric Power Steering (EPS). Common causes include Faulty Accessory Power Module (APM), Accessory Power Module (APM) harness is open or shorted, Accessory Power Module (APM) 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: P1A8A Cadillac indicates 42 Volt System Voltage High.
Common causes: Common causes include Faulty Accessory Power Module (APM), Accessory Power Module (APM) harness is open or shorted, Accessory Power Module (APM) 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 917

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 Feb 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A8A Cadillac Description

The Accessory Power Module (APM) supplies the energy that flows between the high voltage, 300 volt, direct current (DC) and intermediate voltage, 42 volt, DC to support the Electric Power Steering (EPS). The APM receives a 42 volt enable command from the Hybrid Powertrain Control Module (HPCM) over the high speed hybrid GMLAN communication circuit. 42 volt APM functions will run only when the 42 volt APM enable is active on the high speed hybrid GMLAN communication circuit.

OBDII Code P1A8A Cadillac - 42 Volt System Voltage High - AutoCodes.com — P1A8A Cadillac Code - 42 Volt System Voltage High

What does this mean?

What are the Possible Causes of the DTC P1A8A Cadillac?

Faulty Accessory Power Module (APM)
Accessory Power Module (APM) harness is open or shorted
Accessory Power Module (APM) circuit poor electrical connection

How to Fix the DTC P1A8A Cadillac?

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 P1A8A Cadillac 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 P1A8A Cadillac code?

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Need Help with the 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 P1A8A Cadillac Code

1. What are the common symptoms of OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- Common symptoms include the check engine light illuminating on the dashboard and potential issues with the vehicle's electrical system.

2. What are the possible causes of OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- The code may be triggered by a faulty high-voltage battery pack, problems with the battery management system, or issues with the charging system.

3. How can I diagnose OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- Diagnosing this code typically involves using a scan tool to retrieve the specific fault codes, checking the high-voltage battery pack and related components for any signs of damage or malfunction.

4. Can I continue driving my Cadillac with OBDII code P1A8A (42 Volt System Voltage High)?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the electrical system and potentially unsafe driving conditions.

5. How can I repair OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- Repairing this code may involve replacing the high-voltage battery pack, addressing any issues with the battery management system, or repairing faults in the charging system.

6. Is it safe to reset the OBDII code P1A8A Cadillac (42 Volt System Voltage High) and continue driving?

- While resetting the code may temporarily turn off the check engine light, it is important to address the underlying issue before driving the vehicle to prevent potential safety hazards.

7. Can a DIY enthusiast fix OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- Repairing this code may require specialized tools and expertise, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

8. How much does it typically cost to repair OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- The cost of repair can vary depending on the specific issue causing the code, but it can range from a few hundred to a few thousand dollars, including parts and labor.

9. Will OBDII code P1A8A Cadillac (42 Volt System Voltage High) affect the overall performance of the vehicle?

- Yes, this code can affect the performance of the vehicle by causing issues with the electrical system, potentially leading to drivability problems and decreased fuel efficiency.

10. Are there any preventive measures to avoid OBDII code P1A8A Cadillac (42 Volt System Voltage High)?

- Regular maintenance of the high-voltage battery pack, battery management system, and charging system can help prevent issues that may trigger this code.