P1E1F Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
Quick Answer
The power inverter module, also called 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
- P1E1F indicates Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 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.
Code P1E1F Description
Each motor control module measures hybrid battery high voltage with several internal sensors. The motor control modules test for loss of isolation between either the high-voltage positive circuit or high-voltage negative circuit and vehicle chassis. The motor control modules test for isolation when the high-voltage contactor relays are closed. The hybrid powertrain control module 2 only tests the hybrid battery assembly for high-voltage loss of isolation when the high-voltage contactor relays are open.
Motor control module loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high- voltage positive and high-voltage negative circuits. The centre connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage, Motor 2 Isolation Voltage or Auxiliary Transmission Fluid Pump Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The motor control module monitors the loss of isolation voltage measuring circuitry for correct operation.
What are the Possible Causes of the DTC P1E1F?
- 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 P1E1F?
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 P1E1F 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
- P1E1F Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
- P1E1F Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
- P1E1F Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
- P1E1F GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
- P1E1F Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 2 High Voltage
Frequently Asked Questions about P1E1F Code
1. What are the common symptoms of OBDII code P1E1F?
- Common symptoms include the illumination of the check engine light, decreased fuel efficiency, transmission issues, and potential drivability problems.
2. What can cause OBDII code P1E1F to trigger?
- This code can be triggered by issues with the auxiliary transmission fluid pump control module, hybrid battery voltage isolation sensor circuit 2, or high voltage levels in the system.
3. How serious is OBDII code P1E1F?
- This code should be addressed promptly as it can affect the performance and efficiency of the vehicle, especially in hybrid models.
4. How can I diagnose OBDII code P1E1F?
- Diagnosis typically involves using a scan tool to read the code, followed by inspecting the auxiliary transmission fluid pump control module, hybrid battery voltage isolation sensor circuit 2, and related wiring for any faults.
5. Can I still drive my vehicle with OBDII code P1E1F?
- It is not recommended to drive the vehicle with this code present, as it can lead to transmission issues and potential drivability problems.
6. What are some repair tips for OBDII code P1E1F?
- Repair tips may include checking and repairing any damaged wiring, replacing faulty components such as the auxiliary transmission fluid pump control module or isolation sensor, and resetting the code after repairs are made.
7. How much does it cost to fix OBDII code P1E1F?
- The cost of fixing this code can vary depending on the extent of the issue, the cost of parts, and labor charges. It is recommended to consult with a qualified mechanic for an accurate estimate.
8. Can OBDII code P1E1F be a recurring issue?
- If the root cause of the code is not properly addressed, it may recur. Regular maintenance and timely repairs can help prevent the recurrence of this code.
9. Can a DIY enthusiast fix OBDII code P1E1F?
- While some basic troubleshooting and repairs may be possible for experienced DIY enthusiasts, it is recommended to seek professional help for diagnosing and fixing complex issues related to this code.
10. Is it safe to clear OBDII code P1E1F without fixing the underlying problem?
- Clearing the code without addressing the underlying issue is not recommended, as the problem may persist and potentially lead to more severe issues in the future.
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