P1E1B Buick 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 Buick 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 Buick 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 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 P1E1B 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 P1E1B 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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Frequently Asked Questions about P1E1B Buick Code
1. What does the OBDII code P1E1B mean on a Buick?
P1E1B indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically related to the Hybrid Battery Voltage Isolation Sensing Performance.
2. What are the common symptoms of the P1E1B code?
Symptoms may include warning lights on the dashboard, reduced hybrid system performance, erratic transmission operation, or a noticeable drop in fuel efficiency.
3. What causes the P1E1B code to appear?
Common causes include a malfunctioning auxiliary transmission fluid pump, damaged wiring or connectors, a hybrid battery isolation fault, or a faulty control module.
4. Can I drive my Buick with the P1E1B code?
Driving with the P1E1B code is not recommended, as it could lead to further damage to the hybrid system or transmission components.
5. How is the P1E1B code diagnosed?
A technician will use a scan tool to confirm the code, inspect the wiring and connections, test the pump control module, and check the hybrid battery's isolation and voltage levels.
6. What repairs are needed to fix the P1E1B code?
Repairs may involve replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring, reprogramming the control module, or addressing hybrid battery isolation faults.
7. How much does it cost to fix the P1E1B code?
Repair costs can vary depending on the specific issue but typically range from $200 to $1,000, depending on labor and parts.
8. Can a dead or weak hybrid battery cause the P1E1B code?
Yes, a weak or failing hybrid battery can contribute to voltage isolation sensing issues, triggering the P1E1B code.
9. Does resetting the code fix P1E1B?
Resetting the code without addressing the underlying problem will not resolve the issue and the code is likely to return.
10. Is the P1E1B code specific to Buick hybrid models?
Yes, the P1E1B code typically applies to Buick hybrid vehicles equipped with an auxiliary transmission fluid pump and hybrid battery system.
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