AutoCodes – Generic – P1E21

P1E21 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense 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: P1E21 indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense 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 840

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 P1E21 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. Each drive motor control module monitors its internal high voltage sensor for correct operation, no external circuits are involved. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.

OBDII Code P1E21 - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage - AutoCodes.com — P1E21 Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E21?

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 P1E21?

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 P1E21 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

P1E21 Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage
P1E21 Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage
P1E21 Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage
P1E21 GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage
P1E21 Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense 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 P1E21 Code

1. What are common symptoms of OBDII code P1E21?

The common symptoms of OBDII code P1E21 include the check engine light coming on, reduced fuel efficiency, and potential issues with the transmission fluid pump.

2. What could cause the OBDII code P1E21 to appear?

The OBDII code P1E21 typically appears due to a malfunction in the auxiliary transmission fluid pump control module hybrid/EV battery voltage sense circuit, resulting in high voltage readings.

3. How can I diagnose the issue related to OBDII code P1E21?

Diagnosing the issue related to OBDII code P1E21 may involve using a scan tool to read the code, checking the transmission fluid pump control module, and inspecting the hybrid/EV battery voltage sense circuit for any faults.

4. Can I continue driving with OBDII code P1E21 present?

It is not recommended to continue driving with OBDII code P1E21 present, as it can lead to further damage to the vehicle's transmission system and potentially affect other components.

5. What are the repair options for OBDII code P1E21?

Repair options for OBDII code P1E21 may include replacing the auxiliary transmission fluid pump control module, repairing or replacing the hybrid/EV battery voltage sense circuit, and clearing the code with a scan tool.

6. Are there any DIY tips for fixing OBDII code P1E21?

DIY tips for fixing OBDII code P1E21 include checking the electrical connections related to the transmission fluid pump control module and the battery voltage sense circuit for any loose or damaged wires.

7. How serious is OBDII code P1E21?

OBDII code P1E21 is considered a serious issue that should be addressed promptly to prevent further damage to the vehicle's transmission system and ensure safe driving conditions.

8. Can a mechanic reset OBDII code P1E21 without fixing the underlying issue?

While a mechanic can reset OBDII code P1E21 with a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring and potentially causing more significant problems.

9. Is OBDII code P1E21 specific to hybrid or electric vehicles?

OBDII code P1E21 is specific to hybrid and electric vehicles due to its relation to the auxiliary transmission fluid pump control module and the hybrid/EV battery voltage sense circuit.

10. How much does it typically cost to repair OBDII code P1E21?

The cost to repair OBDII code P1E21 can vary depending on the extent of the issue, the specific components needing repair or replacement, and the labor rates of the repair shop. It is recommended to obtain quotes from different mechanics for an accurate estimate.