AutoCodes – Generic – P190A

P190A 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 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 4,264

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

What does this mean?

What are the Possible Causes of the DTC P190A?

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?

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 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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Information for Specific Makes

P190A Buick — Drive Motor Inverter Phase U Temperature Erratic
P190A Cadillac — Drive Motor Inverter Phase U Temperature Erratic
P190A Chevrolet — Drive Motor Inverter Phase U Temperature Erratic
P190A GMC — Drive Motor Inverter Phase U Temperature Erratic

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.