AutoCodes – Generic – P1E31

P1E31 Code - Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module 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: P1E31 indicates Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage.
Common causes: Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module 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 1,191

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 Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E31 Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. This is an internal fault detection of the power inverter module. This fault is handled inside the power inverter module and no external circuits are involved.
Each motor control module operates its respective drive motor based upon hybrid powertrain control module commands. Each motor control module controls its respective motor through the sequencing actuation of high-current switching transistors called insulated gate bipolar transistors. Each motor operates utilising 3-phase alternating current AC electricity. Each insulated gate bipolar transistor operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each motor control module monitors the current of each phase in order to detect out of range current conditions.
Because each individual motor's phase circuits are electrically joined together, the phases normally flow about the same amount of current. The motor control module performs a mathematical calculation to verify that the phase current sensors are accurate. If the U-V-W phase current sensors indicate about the same amount of phase current, the sum of the calculation should be near zero. If the U-V-W phase currents are not similar, this DTC will set.

OBDII Code P1E31 - Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage - AutoCodes.com — P1E31 Code - Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E31?

Program Power Inverter Module
Faulty Power Inverter Module
Power Inverter Module harness is open or shorted
Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1E31?

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 P1E31 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

P1E31 Acura — Master Cylinder Cut Valve No Operation
P1E31 Buick — Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage
P1E31 Cadillac — Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage
P1E31 Chevrolet — Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage
P1E31 GMC — Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage
P1E31 Honda — Master Cylinder Cut Valve No Operation
P1E31 Saturn — Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High 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 P1E31 Code

1. What are common symptoms of OBDII code P1E31?

- Common symptoms include the check engine light coming on, decreased fuel efficiency, transmission shifting issues, and potential stalling or hesitation.

2. What could cause the Auxiliary Transmission Fluid Pump Phase W Current Sensor Circuit High Voltage code (P1E31)?

- Possible causes include a faulty transmission fluid pump, damaged wiring or connectors, issues with the current sensor, or a problem with the transmission control module.

3. How can I diagnose the issue related to code P1E31?

- Diagnosing the problem may require using a professional OBDII scanner to read the code and investigate the transmission fluid pump, current sensor, and associated components for any faults or damage.

4. Can I drive my vehicle with OBDII code P1E31 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further transmission damage and potentially unsafe driving conditions.

5. What are some repair tips for fixing OBDII code P1E31?

- Repair tips may include checking and replacing the transmission fluid pump, inspecting and repairing any damaged wiring or connectors, testing and potentially replacing the current sensor, and resetting the code after repairs are made.

6. Is it safe to continue driving if the check engine light is on due to code P1E31?

- It is best to avoid driving your vehicle when the check engine light is on, as it indicates a potential issue with the transmission system that should be addressed promptly to prevent further damage.

7. How much does it typically cost to repair OBDII code P1E31?

- The cost of repairing this code can vary depending on the extent of the issue, the parts needed for replacement, and whether you choose to do the repairs yourself or seek professional help. It's advisable to get a diagnosis and estimate from a qualified mechanic.

8. Can a DIY enthusiast fix OBDII code P1E31 at home?

- While some DIY enthusiasts may have the skills to address this code at home, it is a complex transmission-related issue that may require specialized tools and knowledge. If you are unsure, it's best to consult a professional mechanic.

9. How urgent is it to address OBDII code P1E31?

- It is important to address this code promptly to prevent further damage to the transmission system. Ignoring the issue can lead to more significant and costly repairs down the line.

10. Are there any preventative measures to avoid OBDII code P1E31 in the future?

- Regular maintenance of the transmission system, including fluid checks and replacements as recommended by the manufacturer, can help prevent issues that may trigger code P1E31.