P1E1C Buick Code - Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low 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
- P1E1C Buick indicates Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low 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 P1E1C 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 P1E1C 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 P1E1C 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 P1E1C 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 P1E1C Buick Code
What does the OBDII code P1E1C mean for my Buick?
The OBDII code P1E1C indicates that there is a problem with the Auxiliary Transmission Fluid Pump Control Module related to the Hybrid Battery Voltage Isolation Sensor Circuit 1, specifically indicating low voltage.
What are the common symptoms of the P1E1C code?
Common symptoms include warning lights on the dashboard, reduced hybrid system performance, erratic shifting, and possible overheating of the transmission.
What could cause the P1E1C code to trigger?
Causes may include a faulty voltage isolation sensor, wiring issues such as shorts or open circuits, a defective auxiliary transmission fluid pump, or low fluid levels in the transmission.
How can I diagnose the P1E1C code?
To diagnose this code, you should use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, check the voltage readings from the isolation sensor, and examine the auxiliary pump for proper operation.
What repairs are typically needed for the P1E1C code?
Repairs may involve replacing the voltage isolation sensor, repairing or replacing damaged wiring, replacing the auxiliary transmission fluid pump, or addressing any fluid level issues.
Is it safe to drive my Buick with the P1E1C code?
It is not recommended to drive your vehicle with this code as it may lead to further damage to the transmission or hybrid system and could pose safety risks.
Can I clear the P1E1C code and hope it goes away?
While you can clear the code, if the underlying issue is not resolved, the code will likely reappear. It's best to diagnose and fix the root cause.
Will the P1E1C code affect my vehicle's fuel efficiency?
Yes, this code can affect fuel efficiency due to inefficient transmission operation and hybrid system performance, resulting in increased fuel consumption.
How much does it typically cost to repair the issues associated with the P1E1C code?
Repair costs can vary widely depending on the specific issue but may range from $100 to over $1,000, depending on whether it involves simple repairs or part replacements.
Discuss the causes and fixes for P1E1C Buick OBDII Code
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