AutoCodes – Generic – P1A84

P1A84 Code - Starter/Generator Control Module Coolant Level Sensor 3 High Voltage

Quick Answer

The Starter/Generator Control Module (SGCM) electronics are immersed in an internal fluid to distribute the heat of the electronics evenly through the SGCM, this electronics internal fluid is not the coolant that is circulated through the SGCM cooling system. 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: P1A84 indicates Starter/Generator Control Module Coolant Level Sensor 3 High Voltage.
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 1,838

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 22, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1A84 Description

OBDII Code P1A84 - Starter/Generator Control Module Coolant Level Sensor 3 High Voltage - AutoCodes.com — P1A84 Code - Starter/Generator Control Module Coolant Level Sensor 3 High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A84?

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 P1A84?

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 does this mean?

Code Tech Notes

If the vehicle is on an extreme angle this code may set.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1A84 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 P1A84 code?

Need more information on how to fix the P1A84 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A84 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1A84 Buick — Starter/Generator Control Module Coolant Level Sensor 3 High Voltage
P1A84 Cadillac — Starter/Generator Control Module Coolant Level Sensor 3 High Voltage
P1A84 Chevrolet — Starter/Generator Control Module Coolant Level Sensor 3 High Voltage
P1A84 GMC — Starter/Generator Control Module Coolant Level Sensor 3 High Voltage
P1A84 Saturn — Starter/Generator Control Module Coolant Level Sensor 3 High Voltage

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 P1A84 Code

What does the OBDII code P1A84 mean?

The OBDII code P1A84 indicates that the Starter/Generator Control Module has detected a high voltage condition from Coolant Level Sensor 3.

What are the common symptoms of the P1A84 code?

Common symptoms include warning lights on the dashboard, potential overheating issues, and reduced performance of the hybrid system.

What can cause the P1A84 code to trigger?

Causes may include a faulty coolant level sensor, wiring issues, abnormal coolant levels, or problems within the Starter/Generator Control Module itself.

How can I diagnose the P1A84 code?

To diagnose the P1A84 code, check for related trouble codes, inspect the coolant level sensor and wiring for damage, and test the functionality of the sensor and control module.

What repairs are commonly needed for the P1A84 code?

Repairs often involve replacing the faulty coolant level sensor, repairing any damaged wiring, or addressing issues within the Starter/Generator Control Module.

Can I drive my vehicle with the P1A84 code?

While it may be possible to drive the vehicle, it is not recommended as it could lead to overheating and potential damage to the hybrid system.

How can I prevent the P1A84 code from occurring?

Preventative measures include regular maintenance checks of the hybrid system, monitoring coolant levels, and ensuring that all wiring and connectors are in good condition.

Will clearing the P1A84 code fix the problem?

Clearing the code may temporarily turn off the warning light, but if the underlying issue is not addressed, the code will likely return.

Is it safe to repair the coolant level sensor on my own?

If you have automotive experience and the necessary tools, you may be able to replace the coolant level sensor yourself; otherwise, it's best to consult a professional.