P1E1C 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 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 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?
- 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?
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 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
- P1E1C Buick — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage
- P1E1C Cadillac — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage
- P1E1C Chevrolet — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage
- P1E1C GMC — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage
- P1E1C Saturn — Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage
Frequently Asked Questions about P1E1C Code
1. What are the common symptoms of OBDII code P1E1C?
Symptoms of this code may include poor hybrid system performance, reduced fuel efficiency, and potential illumination of the check engine light.
2. What are the possible causes of OBDII code P1E1C?
The code P1E1C can be triggered by issues such as a malfunctioning auxiliary transmission fluid pump control module, a faulty hybrid battery voltage isolation sensor, low voltage in the sensor circuit, or wiring/connectivity problems.
3. How serious is OBDII code P1E1C?
This code should be addressed promptly as it can affect the proper functioning of the hybrid system in your vehicle, potentially leading to further complications if left unresolved.
4. Can I continue driving with OBDII code P1E1C present?
It is not recommended to continue driving with this code active, as it may result in reduced performance and efficiency of the hybrid system, and could potentially cause further damage.
5. How can I diagnose OBDII code P1E1C?
Diagnosis of this code typically involves using an OBDII scanner to retrieve the code, followed by inspecting the auxiliary transmission fluid pump control module, the hybrid battery voltage isolation sensor, and related wiring for any visible issues.
6. What are some repair tips for OBDII code P1E1C?
Repairing this code may involve replacing the faulty auxiliary transmission fluid pump control module, hybrid battery voltage isolation sensor, or repairing any damaged wiring or connections in the circuit.
7. Can I reset OBDII code P1E1C without fixing the underlying issue?
While clearing the code may temporarily turn off the check engine light, it is essential to address the root cause of the code to prevent further issues with the hybrid system.
8. Is it possible to prevent OBDII code P1E1C from occurring?
Regular maintenance and inspections of the hybrid system components, as well as addressing any related issues promptly, can help prevent the occurrence of this code.
9. How much does it typically cost to repair OBDII code P1E1C?
The cost of repairing this code can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.
10. Can a DIY enthusiast fix OBDII code P1E1C at home?
While some experienced DIY enthusiasts may be able to diagnose and replace the faulty components associated with this code, it is recommended to seek professional help for a thorough diagnosis and proper repair to ensure the issue is resolved correctly.
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