P1E1C Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code P1E1C in a Cadillac?
- Common symptoms include poor acceleration, transmission shifting issues, reduced fuel efficiency, and the illumination of the check engine light.
2. What could cause the Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage code in a Cadillac?
- Possible causes include a faulty hybrid battery voltage isolation sensor, a malfunctioning auxiliary transmission fluid pump control module, wiring issues, or a low voltage battery.
3. How can I diagnose the P1E1C code in my Cadillac?
- To diagnose this code, it is recommended to use an OBDII scanner to retrieve the specific fault code, inspect the wiring and connections related to the hybrid battery voltage isolation sensor, and test the sensor's functionality.
4. Is it safe to continue driving my Cadillac with the P1E1C fault code?
- It is not advisable to continue driving the vehicle with this fault code present, as it can lead to further damage to the transmission system and potentially cause additional issues.
5. How can I repair the Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage issue in my Cadillac?
- Repairs may involve replacing the faulty hybrid battery voltage isolation sensor, repairing or replacing damaged wiring, or addressing any issues with the auxiliary transmission fluid pump control module.
6. Can a DIY enthusiast fix the P1E1C code in a Cadillac?
- While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing issues related to the hybrid battery and transmission system may require specialized tools and expertise, so it is recommended to consult a professional mechanic.
7. Will resetting the check engine light resolve the P1E1C code in my Cadillac?
- Simply resetting the check engine light will not fix the underlying issue causing the fault code. It is important to diagnose and address the root cause of the problem to prevent it from reoccurring.
8. Are there any recalls or technical service bulletins related to the OBDII code P1E1C in Cadillacs?
- It is recommended to check with a Cadillac dealership or refer to the manufacturer's website for any relevant recalls or technical service bulletins related to this specific fault code.
9. How much can I expect to pay for repairs related to the Auxiliary Transmission Fluid Pump Control Module Hybrid Battery Voltage Isolation Sensor Circuit 1 Low Voltage code in a Cadillac?
- Repair costs can vary depending on the extent of the issue and the specific components that need to be replaced. It is advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.
10. Can a faulty hybrid battery voltage isolation sensor cause other issues in my Cadillac besides triggering the P1E1C fault code?
- Yes, a faulty hybrid battery voltage isolation sensor can potentially cause other issues such as erratic transmission behavior, reduced hybrid system efficiency, and overall drivability concerns.
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