AutoCodes – Generic – P1A8F

P1A8F Code - 14 Volt Power Module Current Sensor Overcurrent

Quick Answer

The Starter/Generator Control Module (SGCM) monitors the 14-volt power module current sensor for an overcurrent condition to protect the MOSFET. Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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: P1A8F indicates 14 Volt Power Module Current Sensor Overcurrent.
Common causes: Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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 3,043

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A8F Description

The Starter/Generator Control Module (SGCM) monitors the 14-volt power module current sensor for an overcurrent condition to protect the MOSFET. In the hardware, an overcurrent protection circuit is used to limit the current, and software monitors for an overcurrent reading in the sensor.

OBDII Code P1A8F - 14 Volt Power Module Current Sensor Overcurrent - AutoCodes.com — P1A8F Code - 14 Volt Power Module Current Sensor Overcurrent

What does this mean?

What are the Possible Causes of the DTC P1A8F?

Faulty Starter/Generator Control Module (SGCM)
Starter/Generator Control Module (SGCM) harness is open or shorted
Starter/Generator Control Module (SGCM) circuit poor electrical connection

How to Fix the DTC P1A8F?

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 P1A8F 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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Need Help with the Code?

Get the P1A8F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1A8F Buick — 14 Volt Power Module Current Sensor Overcurrent
P1A8F Cadillac — 14 Volt Power Module Current Sensor Overcurrent
P1A8F Chevrolet — 14 Volt Power Module Current Sensor Overcurrent
P1A8F GMC — 14 Volt Power Module Current Sensor Overcurrent
P1A8F Saturn — 14 Volt Power Module Current Sensor Overcurrent

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 P1A8F Code

1. What does OBDII code P1A8F mean?

Code P1A8F indicates that the 14 Volt Power Module Current Sensor has detected an overcurrent condition, which could affect the vehicle's electrical system performance.

2. What are the common symptoms of code P1A8F?

Symptoms may include warning lights on the dashboard (such as the check engine light), issues with charging the 12-volt battery, dimming or flickering lights, or reduced electrical system performance.

3. What causes code P1A8F to appear?

Common causes include a faulty 14 Volt Power Module Current Sensor, wiring or connector issues, a malfunctioning power module, or excessive electrical load on the system.

4. Is it safe to drive with code P1A8F?

Driving with this code may be unsafe, as it could affect the electrical system's reliability and lead to battery drainage or failure of critical components.

5. How is code P1A8F diagnosed?

A technician will use a diagnostic scanner to confirm the code, inspect the 14 Volt Power Module Current Sensor, check related wiring and connections, and test the electrical load on the system.

6. Can a weak battery cause code P1A8F?

Yes, a weak or failing 12-volt battery can contribute to this code by overloading the power module and triggering the overcurrent fault.

7. How do you fix code P1A8F?

Repairs may include replacing the 14 Volt Power Module Current Sensor, repairing or replacing damaged wiring or connectors, or addressing excessive electrical loads in the system.

8. How much does it cost to fix code P1A8F?

Repair costs vary depending on the root cause but typically range from $150 to $500, with sensor replacement and labor being the most common expenses.

9. Can a software update fix code P1A8F?

In some cases, a software update for the vehicle's control module may resolve the issue, particularly if the code is caused by a programming glitch.

10. How can I prevent code P1A8F from returning?

To prevent this code, maintain your vehicle's electrical system, avoid overloading it with aftermarket accessories, and check the battery and alternator regularly for proper function.