AutoCodes – Generic – P1AB1

P1AB1 Code - Starter/Generator Phase U-V-W Current Sensor Overcurrent

Quick Answer

The Starter/Generator Control Module (SGCM) phase U/V/W current sensors are used for motor control and power inverter module (PIM) current sensor rationality check. 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: P1AB1 indicates Starter/Generator Phase U-V-W 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 3,201

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1AB1 Description

The Starter/Generator Control Module (SGCM) phase U/V/W current sensors are used for motor control and power inverter module (PIM) current sensor rationality check. The SGCM monitors the current sensor for the following:
- To detect a failure of the U/V/W-phase current sensor circuit below valid range.
- To detect a failure of the U/V/W-phase current sensor circuit above valid range.

OBDII Code P1AB1 - Starter/Generator Phase U-V-W Current Sensor Overcurrent - AutoCodes.com — P1AB1 Code - Starter/Generator Phase U-V-W Current Sensor Overcurrent

What does this mean?

What are the Possible Causes of the DTC P1AB1?

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 P1AB1?

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 P1AB1 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

P1AB1 Buick — Starter/Generator Phase U-V-W Current Sensor Overcurrent
P1AB1 Cadillac — Starter/Generator Phase U-V-W Current Sensor Overcurrent
P1AB1 Chevrolet — Starter/Generator Phase U-V-W Current Sensor Overcurrent
P1AB1 GMC — Starter/Generator Phase U-V-W Current Sensor Overcurrent
P1AB1 Saturn — Starter/Generator Phase U-V-W 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 P1AB1 Code

1. What does the OBDII code P1AB1 mean?

P1AB1 indicates an overcurrent condition in the Starter/Generator Phase U-V-W current sensor, typically related to the hybrid or electric vehicle's powertrain.

2. What are the common symptoms of code P1AB1?

Symptoms include reduced engine or motor power, hybrid system malfunctions, warning lights on the dashboard, or the vehicle entering limp mode.

3. What causes the P1AB1 code to appear?

Common causes include a faulty current sensor, damaged wiring or connectors, issues with the inverter or motor control module, or an actual overcurrent condition in the starter/generator system.

4. Can I drive my vehicle with the P1AB1 code?

Itâ€™s not recommended to drive with this code active, as it may indicate a serious issue with the hybrid or electric powertrain, potentially causing further damage or unsafe operating conditions.

5. How can I diagnose the P1AB1 code?

Start by inspecting the wiring and connectors in the starter/generator circuit for damage, check the current sensor for proper operation, and test the inverter and motor control module for faults.

6. How do I fix the P1AB1 code?

Repairs may include replacing the faulty current sensor, repairing or replacing damaged wiring, or addressing issues with the inverter or motor control module.

7. Can a low battery cause the P1AB1 code?

While unlikely, a weak or failing hybrid battery could potentially trigger powertrain issues that contribute to the code. Itâ€™s worth inspecting the battery and charging system as part of diagnosis.

8. What tools are needed to diagnose P1AB1?

Youâ€™ll need a scan tool capable of reading hybrid or electric vehicle codes, a multimeter to check electrical components, and possibly manufacturer-specific diagnostic software.

9. How much does it cost to fix the P1AB1 code?

Repair costs can vary widely depending on the specific issue but may range from $100 for a wiring repair to over $1,000 if the inverter or motor control module needs replacement.

10. Will clearing the P1AB1 code fix the problem?

Clearing the code will reset the warning light temporarily, but if the underlying issue isnâ€™t resolved, the code and symptoms will likely return.