P1E1B Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
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
- P1E1B indicates Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance.
- 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 P1E1B 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 P1E1B?
- 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 P1E1B?
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 P1E1B 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
- P1E1B Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
- P1E1B Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
- P1E1B Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
- P1E1B GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
- P1E1B Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensing Performance
Frequently Asked Questions about P1E1B Code
1. What are the common symptoms of OBDII code P1E1B?
- Common symptoms include poor hybrid system performance, illuminated warning lights on the dashboard, and potential issues with the transmission fluid pump.
2. What could cause the OBDII code P1E1B to trigger?
- The code P1E1B may be triggered by faults in the auxiliary transmission fluid pump control module, hybrid battery voltage isolation sensing system, or related wiring issues.
3. How can I diagnose the cause of OBDII code P1E1B?
- Diagnosing the cause of P1E1B typically involves using a scan tool to retrieve the code, checking the transmission fluid pump control module, inspecting the hybrid battery voltage isolation system, and testing relevant wiring connections.
4. Is it safe to continue driving with OBDII code P1E1B present?
- It is not recommended to continue driving with the P1E1B code present, as it can indicate potential issues with the hybrid system that may affect vehicle performance and safety.
5. What are the repair options for OBDII code P1E1B?
- Repair options for P1E1B may include replacing the auxiliary transmission fluid pump control module, addressing any faults in the hybrid battery voltage isolation system, and repairing or replacing damaged wiring.
6. Can I reset OBDII code P1E1B without fixing the underlying issue?
- While clearing the code temporarily with a scan tool is possible, it is important to address the underlying issue causing P1E1B to prevent further damage to the hybrid system.
7. Are there any DIY tips for resolving OBDII code P1E1B?
- DIY tips for P1E1B may include checking for loose or damaged wiring connections, inspecting the transmission fluid pump control module for faults, and ensuring proper voltage isolation in the hybrid battery system.
8. How much does it typically cost to repair OBDII code P1E1B?
- Repair costs for P1E1B can vary depending on the specific cause of the issue, but they may range from a few hundred to a few thousand dollars, including parts and labor.
9. Can a mechanic help me fix OBDII code P1E1B, or do I need to visit a dealership?
- A qualified mechanic should be able to diagnose and repair OBDII code P1E1B, but if specialized tools or expertise are required, a dealership or hybrid specialist may be recommended.
10. How often does OBDII code P1E1B occur in hybrid vehicles?
- OBDII code P1E1B is relatively rare but can occur in hybrid vehicles with auxiliary transmission fluid pumps and complex battery voltage isolation systems.
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