AutoCodes – Buick – P1E22 Buick

P1E22 Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

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: P1E22 Buick indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost.
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 833

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 P1E22 Buick 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 P1E22 Buick - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost - AutoCodes.com — P1E22 Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

What does this mean?

What are the Possible Causes of the DTC P1E22 Buick?

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 P1E22 Buick?

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 P1E22 Buick 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 P1E22 Buick Code

1. What does the OBDII code P1E22 mean for a Buick?

The P1E22 code indicates that the Auxiliary Transmission Fluid Pump Control Module has detected a loss of voltage system isolation in the hybrid or EV battery system.

2. What are the symptoms of the P1E22 code in a Buick?

Common symptoms include a check engine light, reduced hybrid/EV performance, limited driving range, or the vehicle entering limp mode.

3. What causes the P1E22 code to appear?

Possible causes include damaged or degraded hybrid/EV battery insulation, faulty wiring, a malfunctioning auxiliary transmission fluid pump, or issues with the control module.

4. Can the P1E22 code cause drivability issues?

Yes, this code can result in reduced vehicle performance or prevent the hybrid/EV system from functioning correctly.

5. How is the P1E22 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the hybrid/EV battery insulation and wiring, and test the auxiliary transmission fluid pump and control module.

6. Is it safe to drive with a P1E22 code?

Driving with this code is not recommended, as it may compromise the safety and efficiency of the hybrid/EV system.

7. How can the P1E22 code be fixed?

Repairs may include replacing damaged wiring, repairing or replacing the hybrid/EV battery, or addressing faults in the auxiliary transmission fluid pump or control module.

8. How much does it cost to fix the P1E22 code in a Buick?

Repair costs vary depending on the issue but can range from $200 for minor wiring repairs to over $2,000 for hybrid/EV battery replacement.

9. Can a P1E22 code be cleared without repairs?

While you can clear the code with a scan tool, it is likely to return if the underlying issue is not resolved.

10. What preventative maintenance can help avoid the P1E22 code?

Regular inspections of the hybrid/EV battery, wiring, and auxiliary transmission systems can help detect potential issues early and prevent this code from appearing.