AutoCodes – GMC – P1A8E GMC

P1A8E GMC Code - 14 Volt Power Module Voltage Sensor Circuit High Voltage

Quick Answer

The Auxiliary Power Module (APM) 12-volt output voltage is used for a 12-volt line APM output voltage control and a 12-volt line voltage sensor rationality check. Common causes include Faulty 14 Volt Power Module Voltage Sensor, 14 Volt Power Module Voltage Sensor harness is open or shorted, 14 Volt Power Module Voltage Sensor 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: P1A8E GMC indicates 14 Volt Power Module Voltage Sensor Circuit High Voltage.
Common causes: Common causes include Faulty 14 Volt Power Module Voltage Sensor, 14 Volt Power Module Voltage Sensor harness is open or shorted, 14 Volt Power Module Voltage Sensor 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 947

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 P1A8E GMC Description

The Auxiliary Power Module (APM) 12-volt output voltage is used for a 12-volt line APM output voltage control and a 12-volt line voltage sensor rationality check. The Starter/Generator Control Module (SGCM) monitors the voltage sensor for the following:
To detect the failure of the APM 12-volt voltage sensor circuit below valid range.
To detect the failure of the APM 12-volt voltage sensor circuit above valid range.

OBDII Code P1A8E GMC - 14 Volt Power Module Voltage Sensor Circuit High Voltage - AutoCodes.com — P1A8E GMC Code - 14 Volt Power Module Voltage Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A8E GMC?

Faulty 14 Volt Power Module Voltage Sensor
14 Volt Power Module Voltage Sensor harness is open or shorted
14 Volt Power Module Voltage Sensor circuit poor electrical connection

How to Fix the DTC P1A8E 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 P1A8E 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 P1A8E GMC 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 P1A8E GMC Code

1. What are the common symptoms of OBDII code P1A8E in a GMC vehicle?

- Common symptoms include illuminated Check Engine Light, decreased fuel efficiency, and potential issues with the vehicle's electrical system.

2. What is the most likely cause of OBDII code P1A8E indicating a 14 Volt Power Module Voltage Sensor Circuit High Voltage in a GMC?

- The most likely cause is a malfunctioning voltage sensor within the 14 Volt Power Module.

3. How can I diagnose the issue related to OBDII code P1A8E in my GMC?

- Diagnosing the problem involves using a diagnostic scanner to read the code, checking the voltage sensor and related wiring for any visible damage or loose connections.

4. Can a faulty battery or alternator trigger OBDII code P1A8E in a GMC?

- Yes, a faulty battery or alternator can sometimes trigger this code due to voltage irregularities affecting the power module sensor.

5. What are the repair options for resolving OBDII code P1A8E in a GMC?

- Repair options may include replacing the faulty voltage sensor, repairing damaged wiring, or addressing any underlying issues with the vehicle's electrical system.

6. Is it safe to continue driving with OBDII code P1A8E present in a GMC?

- It is generally not recommended to continue driving with this code present, as it can lead to further electrical issues and potential damage to the vehicle.

7. How much does it typically cost to repair OBDII code P1A8E in a GMC?

- The cost of repair can vary depending on the specific issue, but it may range from $200 to $500 for parts and labor.

8. Can resetting the OBDII code P1A8E in a GMC make it go away permanently?

- Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue is not addressed, the code is likely to reappear.

9. Are there any preventive maintenance steps to avoid triggering OBDII code P1A8E in a GMC?

- Keeping up with regular vehicle maintenance, such as checking the battery and alternator health, can help prevent issues that may trigger this code.

10. Does OBDII code P1A8E affect the overall performance of a GMC vehicle?

- Yes, if left unresolved, this code can affect the vehicle's performance, fuel efficiency, and overall reliability due to potential electrical system issues.