AutoCodes – Generic – P1AB3

P1AB3 Code - Starter/Generator Phase U Current Sensor Circuit Low Voltage

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: P1AB3 indicates Starter/Generator Phase U Current Sensor Circuit Low 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 1,445

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 P1AB3 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 P1AB3 - Starter/Generator Phase U Current Sensor Circuit Low Voltage - AutoCodes.com — P1AB3 Code - Starter/Generator Phase U Current Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1AB3?

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 P1AB3?

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 P1AB3 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 P1AB3 code?

Need more information on how to fix the P1AB3 code? Get Access to Factory Service Manuals

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Information for Specific Makes

P1AB3 Buick — Starter/Generator Phase U Current Sensor Circuit Low Voltage
P1AB3 Cadillac — Starter/Generator Phase U Current Sensor Circuit Low Voltage
P1AB3 Chevrolet — Starter/Generator Phase U Current Sensor Circuit Low Voltage
P1AB3 GMC — Starter/Generator Phase U Current Sensor Circuit Low Voltage
P1AB3 Saturn — Starter/Generator Phase U Current Sensor Circuit Low 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 P1AB3 Code

1. What does the OBDII code P1AB3 mean?

The P1AB3 code indicates a low voltage issue in the Starter/Generator Phase U Current Sensor Circuit, which monitors the electrical current in the hybrid or electric vehicle's starter/generator system.

2. What are the common symptoms of the P1AB3 code?

Symptoms may include a check engine light, reduced hybrid system performance, poor fuel efficiency, or failure of the starter/generator to operate properly.

3. What causes the P1AB3 code to appear?

Common causes include a faulty Phase U current sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning powertrain control module (PCM).

4. How is the P1AB3 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the current sensor to verify proper operation.

5. Can a faulty battery cause the P1AB3 code?

Yes, a weak or failing hybrid battery might contribute to the error if it disrupts the starter/generator system's voltage regulation.

6. How do you fix the P1AB3 code?

Repairs may include replacing the Phase U current sensor, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. Is it safe to drive with the P1AB3 code active?

Driving with this code may not be safe, as it could lead to reduced performance or failure of the hybrid system, potentially leaving you stranded.

8. How much does it cost to fix the P1AB3 code?

Repair costs can vary but typically range from $100 to $500, depending on the extent of the issue and whether the sensor, wiring, or PCM needs replacement.

9. Can the P1AB3 code clear itself?

The code may clear temporarily if the issue is intermittent, but the underlying problem will likely return until properly repaired.

10. What tools are needed to diagnose the P1AB3 code?

You will need an OBDII scan tool, a multimeter for testing electrical circuits, and possibly a service manual for wiring diagrams specific to your vehicle.