AutoCodes – Generic – P1E1E

P1E1E Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage

Quick Answer

The power inverter module, also called 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: P1E1E indicates Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low 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 1,708

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 P1E1E Description

The power inverter module, also called 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. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.
Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between either the high-voltage positive circuit or high-voltage negative circuit and vehicle chassis. The motor control modules test for isolation when the high-voltage contactor relays are closed. The hybrid powertrain control module 2 only tests the hybrid battery assembly for high-voltage loss of isolation when the high-voltage contactor relays are open.
Motor control module loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high- voltage positive and high-voltage negative circuits. The centre connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module 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, Motor 2 Isolation Voltage or Auxiliary Transmission Fluid Pump 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 motor control module monitors the loss of isolation voltage measuring circuitry for correct operation.

OBDII Code P1E1E - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage - AutoCodes.com — P1E1E Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1E1E?

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 P1E1E?

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 P1E1E 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

P1E1E Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage
P1E1E Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage
P1E1E Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage
P1E1E GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 Low Voltage
P1E1E Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 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 P1E1E Code

1. What does the OBDII code P1E1E mean?

P1E1E indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically related to Hybrid Battery Voltage Isolation Sensor Circuit 2 detecting low voltage.

2. What are common symptoms of the P1E1E code?

Symptoms may include the check engine light turning on, reduced hybrid system performance, erratic transmission behavior, or a failure in the auxiliary transmission fluid pump operation.

3. What causes the P1E1E code to appear?

Common causes include a faulty hybrid battery isolation sensor, damaged wiring or connectors in the circuit, a defective auxiliary transmission fluid pump control module, or low voltage from the hybrid battery.

4. Can I drive my vehicle with the P1E1E code active?

Driving with this code is not recommended, as it may lead to further damage to the transmission or hybrid system and can compromise vehicle performance.

5. How do I diagnose the P1E1E code?

Diagnosis involves using a scan tool to read live data, inspecting wiring and connectors for damage, testing the hybrid battery voltage isolation sensor, and verifying proper operation of the auxiliary transmission fluid pump.

6. How is the P1E1E code repaired?

Repairs may include replacing the faulty hybrid battery isolation sensor, repairing damaged wiring or connectors, replacing the auxiliary transmission fluid pump control module, or addressing hybrid battery issues.

7. Can a low hybrid battery charge trigger the P1E1E code?

Yes, if the hybrid battery voltage drops significantly, it can trigger this code, as the system may interpret low voltage as a circuit issue.

8. What tools are needed to fix the P1E1E code?

Youâ€™ll need an OBDII scan tool with hybrid diagnostic capabilities, a multimeter for testing circuits, and potentially a wiring diagram for troubleshooting.

9. Is the P1E1E code specific to hybrid vehicles?

Yes, this code is specific to hybrid vehicles with an auxiliary transmission fluid pump and a hybrid battery voltage isolation sensor.

10. How much does it cost to fix the P1E1E code?

Repair costs vary depending on the cause but can range from $100 for minor wiring repairs to over $1,000 if the hybrid battery or control module needs replacement.