AutoCodes – Cadillac – P1EC9 Cadillac

P1EC9 Cadillac Code - A/C Compressor Motor Instantaneous High Current

Quick Answer

The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin, help dehumidify the air in a defrost mode and help maintain the battery temperature. Common causes include Faulty A/C Compressor Motor, A/C Compressor Motor harness is open or shorted, A/C Compressor Motor circuit poor electrical connection. 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: P1EC9 Cadillac indicates A/C Compressor Motor Instantaneous High Current.
Common causes: Common causes include Faulty A/C Compressor Motor, A/C Compressor Motor harness is open or shorted, A/C Compressor Motor circuit poor electrical connection.
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.

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Code Popularity 790

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1EC9 Cadillac Description

The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin, help dehumidify the air in a defrost mode and help maintain the battery temperature. Rather than a more typical pulley, the A/C compressor uses a 3-phase alternating current, high voltage electric motor to operate. It has an on-board inverter that takes High Voltage direct current from the vehicle's High Voltage Battery and inverts it to alternating current for the motor. The AC compressor shall be activated when any of the three following events occur:
- The customer pushes the AC button
- The HVAC control, in AUTO mode, requests the electric AC compressor on to help in cooling the cabin or removing moisture in the defrost mode
- The High Voltage Battery Thermal System requests the AC compressor on to help maintain the battery temperature
The Hybrid/EV Powertrain Control Module 2 uses values from the A/C refrigerant pressure transducers, A/C refrigerant thermistor, duct temperature sensors, ambient air temperature sensor, passenger compartment temperature sensor, evaporator temperature sensor, battery cell temperature sensors, battery coolant temperature sensors and battery coolant pumps to determine the speed at which the compressor will operate. This speed request message is sent from the Hybrid/EV Powertrain Control Module 2 to the A/C compressor control module via GM LAN message.

OBDII Code P1EC9 Cadillac - A/C Compressor Motor Instantaneous High Current - AutoCodes.com — P1EC9 Cadillac Code - A/C Compressor Motor Instantaneous High Current

What does this mean?

What are the Possible Causes of the DTC P1EC9 Cadillac?

Faulty A/C Compressor Motor
A/C Compressor Motor harness is open or shorted
A/C Compressor Motor circuit poor electrical connection

How to Fix the DTC P1EC9 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 P1EC9 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1EC9 Cadillac Code

1. What are the common symptoms of OBDII code P1EC9 in a Cadillac related to the A/C compressor motor instantaneous high current?

- Common symptoms include the A/C system not cooling properly, unusual noises coming from the compressor, and the A/C system intermittently working.

2. What are the possible causes of OBDII code P1EC9 in a Cadillac indicating high current in the A/C compressor motor?

- The code may be triggered by issues such as a faulty A/C compressor motor, wiring issues, a defective compressor clutch, or a failing compressor.

3. How can I diagnose the cause of OBDII code P1EC9 in my Cadillac related to the A/C compressor motor high current?

- Diagnosing the issue may involve checking the A/C compressor motor and clutch for proper operation, inspecting the wiring for any damage, and testing the compressor for internal faults.

4. Can a DIY enthusiast repair OBDII code P1EC9 in a Cadillac caused by high current in the A/C compressor motor?

- While some basic inspections like checking wiring connections can be done by a DIY enthusiast, it's recommended to have a professional diagnose and repair complex A/C compressor motor issues.

5. Are there any quick tips to troubleshoot OBDII code P1EC9 in a Cadillac related to high current in the A/C compressor motor?

- Quick tips include checking the A/C system fuse, ensuring the compressor clutch engages when the A/C is turned on, and listening for any unusual sounds coming from the compressor.

6. How crucial is it to address OBDII code P1EC9 in a Cadillac indicating high current in the A/C compressor motor?

- It is important to address this code promptly as ignoring it can lead to further damage to the A/C system, potentially causing the compressor to fail completely.

7. What are the potential repair costs associated with fixing OBDII code P1EC9 in a Cadillac due to high current in the A/C compressor motor?

- Repair costs can vary depending on the underlying issue, but they may include expenses for parts like a new compressor motor or clutch, as well as labor charges for diagnosis and repair.

8. Can driving with OBDII code P1EC9 in a Cadillac related to high current in the A/C compressor motor cause any long-term damage?

- Continuing to drive with this code can lead to decreased A/C performance, increased strain on the compressor components, and potential compressor failure if left unresolved.

9. Is it safe to reset OBDII code P1EC9 in a Cadillac related to high current in the A/C compressor motor and continue driving?

- Resetting the code without addressing the underlying issue is not recommended, as the problem will persist and potentially worsen over time, affecting the A/C system's functionality.

10. How can regular maintenance help prevent OBDII code P1EC9 in a Cadillac related to high current in the A/C compressor motor?

- Regular maintenance, such as checking the A/C system for leaks, ensuring proper refrigerant levels, and inspecting the compressor components, can help prevent issues leading to this code.