AutoCodes – Chevrolet – P1E21 Chevrolet

P1E21 Chevrolet 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 Chevrolet 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 1,067

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

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 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 P1E21 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.

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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 Chevrolet Code

1. What does the OBDII code P1E21 mean for a Chevrolet vehicle?

The code P1E21 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically a high voltage detected in the Hybrid/EV battery voltage sense circuit.

2. What are the common symptoms of a P1E21 code?

Symptoms may include an illuminated check engine light, reduced vehicle performance, issues with shifting in hybrid/EV modes, or erratic transmission behavior.

3. What causes the P1E21 code to trigger?

Common causes include a malfunctioning auxiliary transmission fluid pump control module, damaged wiring or connectors in the voltage sense circuit, or a fault in the hybrid/EV battery system.

4. Can I drive my vehicle with a P1E21 code?

It is not recommended to drive the vehicle, as this code may indicate issues with critical hybrid/EV components, potentially causing further damage or unsafe operation.

5. How is the P1E21 code diagnosed?

A technician will use a scan tool to confirm the code, check for related codes, inspect the hybrid/EV battery system, and test the voltage sense circuit and associated components.

6. What repairs can fix the P1E21 code?

Repairs may include replacing the auxiliary transmission fluid pump control module, repairing or replacing damaged wiring or connectors, or servicing the hybrid/EV battery system.

7. Can a dead hybrid/EV battery cause the P1E21 code?

Yes, a malfunctioning or damaged hybrid/EV battery could cause voltage irregularities that trigger this code.

8. What tools are needed to troubleshoot the P1E21 code?

Diagnostic tools include an OBDII scanner, a multimeter for voltage testing, and possibly a specialized diagnostic device for hybrid/EV systems.

9. How much does it typically cost to repair a P1E21 code?

Repair costs vary, but they can range from $200 to over $1,000, depending on whether the issue is a simple wiring repair or a major component replacement.

10. Can I clear the P1E21 code without fixing the issue?

Clearing the code without addressing the underlying problem is not recommended, as the issue will likely return and could lead to further damage.