AutoCodes – GMC – P190A GMC

P190A GMC Code - Drive Motor Inverter Phase U Temperature Erratic

Quick Answer

The Generator Control Module also called the Starter/Generator Control Module is comprised of the following three control modules: the Hybrid/EV Powertrain Control Module 1, 14 V Power Module, and the Drive Motor Control Module. Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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: P190A GMC indicates Drive Motor Inverter Phase U Temperature Erratic.
Common causes: Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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 541

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 Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P190A GMC Description

The Generator Control Module also called the Starter/Generator Control Module is comprised of the following three control modules: the Hybrid/EV Powertrain Control Module 1, 14 V Power Module, and the Drive Motor Control Module. These three control modules are non-serviceable and are part of the Starter/Generator Control Module.
This is an internal fault detection of the Starter/Generator Control Module, and no external circuits are involved.
The Diagnostic Trouble Code (DTC) will be set when the Drive Motor Control Module has detected an erratic temperature on inverter phase U for greater than 28 s.

OBDII Code P190A GMC - Drive Motor Inverter Phase U Temperature Erratic - AutoCodes.com — P190A GMC Code - Drive Motor Inverter Phase U Temperature Erratic

What does this mean?

What are the Possible Causes of the DTC P190A GMC?

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

How to Fix the DTC P190A 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 P190A 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.

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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 P190A GMC Code

What does the OBDII code P190A mean on a GMC vehicle?

The P190A code indicates that the Drive Motor Inverter Phase U Temperature is showing erratic readings, which may signal a problem with the inverter or its associated components.

What are common symptoms of the P190A code on a GMC?

Symptoms may include reduced vehicle performance, illumination of the check engine light or hybrid warning light, and potential overheating issues with the drive motor inverter.

What causes the P190A code to appear?

Common causes include a faulty temperature sensor in the drive motor inverter, wiring or connector issues, or a malfunction within the drive motor inverter itself.

Can the P190A code cause damage if not addressed?

Yes, ignoring this code can lead to overheating of the drive motor inverter, which may cause further damage to the hybrid or electric drive system.

How do you diagnose the P190A code?

Diagnosis typically involves scanning the vehicle for codes, inspecting the drive motor inverter and its wiring, and testing the temperature sensor for proper functionality.

Is it safe to drive with the P190A code active?

It is not recommended to drive with this code active, as it can lead to overheating and potential damage to the inverter or other drivetrain components.

What repairs are typically needed to fix the P190A code?

Repairs may involve replacing the drive motor inverter temperature sensor, repairing wiring or connectors, or replacing the entire drive motor inverter if necessary.

How much does it cost to fix the P190A code on a GMC?

Repair costs vary but can range from $200 to $1,500 depending on whether the sensor, wiring, or entire inverter needs replacement.

Can the P190A code be cleared without repairs?

Clearing the code without addressing the root cause may only be a temporary fix, as the issue is likely to reoccur.

What preventive measures can help avoid the P190A code?

Regular maintenance, inspecting wiring and connectors, and monitoring the cooling system for the drive motor inverter can help prevent this code from appearing.