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P1AF4 Chevrolet Code - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage

Quick Answer

The drive motor generator Power Inverter Control Module (PIM) contains two Motor Control Modules (MCMs). Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) harness is open or shorted. 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: P1AF4 Chevrolet indicates Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage.
Common causes: Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) harness is open or shorted.
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 1,341

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 Mar 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1AF4 Chevrolet Description

The drive motor generator Power Inverter Control Module (PIM) contains two Motor Control Modules (MCMs). Each MCM measures hybrid battery High Voltage (HV) with several internal sensors. The MCMs test for Loss Ff Isolation (LOI) between either the HV positive circuit or HV negative circuit and vehicle chassis. The MCMs test for isolation when the HV contactor relays are closed. The battery energy control module (BECM) only tests the hybrid battery assembly for HV loss of isolation when the HV contactor relays are open.
MCM LOI is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the HV positive and HV negative circuits. The center connection of the two resistors is also connected to vehicle chassis. The MCM then measures the voltage drop across one of the resistors. Without a loss of isolation, the MCM should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The Mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage or Motor 2 Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The MCM monitors the LOI voltage measuring circuitry for correct operation.

OBDII Code P1AF4 Chevrolet - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage - AutoCodes.com — P1AF4 Chevrolet Code - Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1AF4 Chevrolet?

Reprogram Power Inverter Control Module (PIM)
Faulty Power Inverter Control Module (PIM)
Power Inverter Control Module (PIM) harness is open or shorted
Power Inverter Control Module (PIM) circuit poor electrical connection

How to Fix the DTC P1AF4 Chevrolet?

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 P1AF4 Chevrolet 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 P1AF4 Chevrolet code?

Need more information on how to fix the P1AF4 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1AF4 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P1AF4 Chevrolet Code

1. What are common symptoms of OBDII code P1AF4 in a Chevrolet related to the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage?

Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What could cause the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit to report low voltage in a Chevrolet?

Possible causes can include a faulty isolation sensor, damaged wiring or connectors in the circuit, issues with the control module, or a problem with the hybrid battery itself.

3. How can I diagnose the source of the low voltage issue in the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit in a Chevrolet?

Diagnosis typically involves using a scan tool to read the OBDII code P1AF4, conducting a visual inspection of wiring and connectors, testing the isolation sensor, and checking the hybrid battery voltage.

4. Are there any safety precautions to consider when working on the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit in a Chevrolet?

Yes, it is important to follow all safety procedures outlined in the vehicle's service manual, including disabling the high-voltage system and wearing appropriate personal protective equipment when working on hybrid components.

5. Can I continue driving my Chevrolet with OBDII code P1AF4 related to the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage?

It is not recommended to continue driving the vehicle with this issue, as it can lead to further damage to the hybrid system components and potential safety hazards.

6. How costly is it to repair the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage issue in a Chevrolet?

The cost of repair can vary depending on the exact cause of the low voltage issue, but it may involve replacing the isolation sensor, repairing damaged wiring, or addressing issues with the control module or hybrid battery.

7. Can I reset the OBDII code P1AF4 related to the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage myself?

While you can clear the code using a scan tool, it is important to address the underlying issue causing the low voltage condition to prevent the code from reoccurring.

8. Is it possible to prevent OBDII code P1AF4 from appearing in a Chevrolet related to the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage?

Regular maintenance, including checking the hybrid system components for any signs of wear or damage, can help prevent this code from appearing. Additionally, prompt attention to any related symptoms can help catch issues early.

9. How long does it typically take to repair the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage issue in a Chevrolet?

The repair time can vary depending on the exact cause of the low voltage condition and the availability of parts. It is best to consult with a professional mechanic for a more accurate estimate.

10. Are there any recalls or technical service bulletins related to OBDII code P1AF4 in a Chevrolet for the Drive Motor 1 Control Module Hybrid Battery Voltage Isolation Sensor Circuit Low Voltage?

It is recommended to check with a Chevrolet dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or technical service bulletins addressing this specific OBDII code.