AutoCodes – Saturn – P1E28 Saturn

P1E28 Saturn Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System 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: P1E28 Saturn indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System 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 709

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 P1E28 Saturn 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 P1E28 Saturn - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage - AutoCodes.com — P1E28 Saturn Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System Voltage

What does this mean?

What are the Possible Causes of the DTC P1E28 Saturn?

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 P1E28 Saturn?

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 P1E28 Saturn 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 P1E28 Saturn Code

What does the OBDII code P1E28 mean for a Saturn vehicle?

P1E28 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module related to the Hybrid/EV Battery System Voltage, often pointing to voltage irregularities or communication problems.

What are the common symptoms of the P1E28 code in a Saturn?

Common symptoms include an illuminated check engine light, erratic transmission operation, reduced hybrid/EV performance, or the vehicle entering limp mode.

What causes the P1E28 code to be triggered?

Potential causes include a faulty auxiliary transmission fluid pump, damaged wiring or connectors, issues with the battery system voltage, or a malfunctioning control module.

How can I diagnose the P1E28 code on my Saturn?

Use an OBDII scanner to confirm the code, inspect the auxiliary transmission fluid pump and its wiring, and check for voltage irregularities in the hybrid/EV battery system.

Can a low hybrid/EV battery cause the P1E28 code?

Yes, insufficient voltage or a failing hybrid/EV battery system can trigger this code due to its impact on the auxiliary transmission fluid pump.

Is it safe to drive with the P1E28 code active?

Driving with the P1E28 code is not recommended, as it can lead to further damage to the transmission or hybrid/EV system and may result in reduced vehicle performance.

How do I fix the P1E28 code on a Saturn?

Repairs may involve replacing the auxiliary transmission fluid pump, repairing damaged wiring or connectors, updating or reprogramming the control module, or addressing hybrid/EV battery issues.

Can a software update resolve the P1E28 code?

In some cases, a control module software update from the manufacturer can resolve communication or compatibility issues causing the P1E28 code.

How much does it cost to repair the P1E28 code on a Saturn?

Repair costs vary depending on the root cause, ranging from $100 for wiring repairs to $1,000 or more for replacing the auxiliary pump or hybrid/EV battery components.

Can the P1E28 code be prevented?

Regular maintenance, including inspecting the hybrid/EV battery system and transmission components, can help prevent issues leading to the P1E28 code.