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P1E20 Saturn Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage

Quick Answer

The P1E20 diagnostic trouble code for Saturn vehicles indicates a problem with the Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit, specifically detecting low voltage. Common causes include Faulty wiring or connectors in the Hybrid/EV Battery Voltage Sense Circuit, Malfunctioning Auxiliary Transmission Fluid Pump Control Module, Weak or failing battery pack. 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
P1E20 Saturn indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage.
Common causes
Common causes include Faulty wiring or connectors in the Hybrid/EV Battery Voltage Sense Circuit, Malfunctioning Auxiliary Transmission Fluid Pump Control Module, Weak or failing battery pack.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P1E20 Saturn Description

The P1E20 diagnostic trouble code for Saturn vehicles indicates a problem with the Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit, specifically detecting low voltage. This code is commonly found in hybrid or electric vehicles due to the complex nature of their powertrain systems. The Auxiliary Transmission Fluid Pump Control Module is responsible for regulating the transmission fluid pump in hybrid and electric vehicles, ensuring smooth operation and efficient power delivery. The Hybrid/EV Battery Voltage Sense Circuit monitors the voltage levels in the vehicle's battery pack to ensure proper charging and discharging.

OBDII Code P1E20 Saturn - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage
P1E20 Saturn Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit Low Voltage

Common Causes of P1E20 Saturn

  1. Faulty wiring or connectors in the Hybrid/EV Battery Voltage Sense Circuit
  2. Malfunctioning Auxiliary Transmission Fluid Pump Control Module
  3. Weak or failing battery pack
  4. Issues with the vehicle's charging system
  5. Corrosion or damage to electrical components

Symptoms of P1E20 Saturn

  1. Erratic shifting or transmission slippage
  2. Reduced power delivery or acceleration
  3. Check Engine Light illuminated
  4. Decreased fuel efficiency
  5. Vehicle going into limp mode

How to Fix P1E20 Saturn

  1. Perform a thorough inspection of the Hybrid/EV Battery Voltage Sense Circuit and wiring for any signs of damage or corrosion.
  2. Test the voltage levels in the battery pack to determine if it is functioning within the proper range.
  3. Check the Auxiliary Transmission Fluid Pump Control Module for any faults or malfunctions.
  4. Repair or replace any damaged wiring, connectors, or components in the Hybrid/EV Battery Voltage Sense Circuit.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1E20 Saturn

The typical repair costs for addressing the P1E20 code in a Saturn vehicle can vary depending on the exact cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $800. It's important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle specifics.

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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 P1E20 Saturn Code

1. What does the OBDII code P1E20 mean on a Saturn vehicle?

P1E20 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically a low voltage in the Hybrid/EV battery voltage sense circuit.

2. What are the common symptoms of the P1E20 code?

Symptoms may include a lit check engine light, reduced hybrid performance, transmission overheating, or the vehicle entering limp mode.

3. What causes the P1E20 code to appear?

Common causes include a faulty auxiliary transmission fluid pump control module, damaged wiring or connectors, a weak hybrid/EV battery, or a malfunctioning voltage sensor.

4. Can I drive my Saturn with the P1E20 code present?

It's not recommended, as the code may lead to reduced transmission cooling and potential damage to hybrid components if left unaddressed.

5. How do I diagnose the P1E20 code?

Begin by inspecting the wiring and connectors for damage or corrosion, test the hybrid/EV battery voltage, and check the auxiliary transmission fluid pump control module for faults.

6. What repairs are typically needed for a P1E20 code?

Repairs may involve replacing the faulty control module, repairing damaged wiring, cleaning corroded connectors, or addressing issues with the hybrid/EV battery.

7. How much does it cost to fix the P1E20 code on a Saturn?

Repair costs vary, but replacing the control module can range from $300 to $1,000, depending on labor and part costs.

8. Can a weak hybrid/EV battery trigger the P1E20 code?

Yes, a weak or failing hybrid/EV battery can cause low voltage in the system, triggering this code.

9. Does the P1E20 code affect fuel efficiency?

Yes, it can reduce fuel efficiency in hybrid vehicles due to impaired transmission and hybrid system performance.

10. Can clearing the P1E20 code with a scan tool fix the problem?

Clearing the code may reset the check engine light temporarily, but it won’t resolve the underlying issue causing the code.

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