AutoCodes – Chevrolet – P1EC9 Chevrolet

P1EC9 Chevrolet 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 Chevrolet 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 1,701

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC P1EC9 Chevrolet?

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 Chevrolet?

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 Chevrolet 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.

Need more information about the P1EC9 Chevrolet code?

Need more information on how to fix the P1EC9 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EC9 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

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

The common symptoms may include the A/C not blowing cold air, unusual noises coming from the A/C compressor, and the A/C system not turning on at all.

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

Possible causes may include a faulty A/C compressor motor, a short circuit in the A/C compressor wiring, a problem with the A/C compressor clutch, or issues with the vehicle's electrical system.

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

Diagnosis typically involves checking the A/C compressor motor for proper operation, inspecting the wiring for any visible damage, testing the A/C compressor clutch, and performing a thorough electrical system check.

4. Can I continue driving my Chevrolet with OBDII code P1EC9 related to the A/C compressor motor?

It is not recommended to continue driving with this code present, as it can lead to further damage to the A/C system and potentially cause other issues. It's best to address the problem promptly.

5. How can I repair OBDII code P1EC9 indicating A/C compressor motor instantaneous high current in my Chevrolet?

Repair steps may include replacing the faulty A/C compressor motor, repairing any damaged wiring, fixing issues with the A/C compressor clutch, and ensuring proper electrical connections.

6. Is it possible to reset OBDII code P1EC9 in my Chevrolet without fixing the underlying issue?

While you can clear the code with a diagnostic tool, it will likely reappear if the root cause is not addressed. It's important to fix the issue to prevent further problems.

7. Are there any preventive maintenance tips to avoid OBDII code P1EC9 related to the A/C compressor motor in a Chevrolet?

Regularly inspecting the A/C system, ensuring proper maintenance of the A/C compressor motor, and addressing any unusual noises or performance issues promptly can help prevent this code.

8. Can a DIY enthusiast tackle the repair of OBDII code P1EC9 indicating A/C compressor motor instantaneous high current in a Chevrolet?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this issue. However, it's recommended to consult a professional mechanic for accurate diagnosis and repair.

9. Will fixing OBDII code P1EC9 in my Chevrolet affect the overall performance of the A/C system?

Fixing this code should restore the proper operation of the A/C system, ensuring it blows cold air and functions correctly. It is important to address the issue promptly to avoid further complications.

10. How long does it typically take to repair OBDII code P1EC9 related to the A/C compressor motor in a Chevrolet?

The repair time can vary depending on the exact cause of the code and the extent of the repairs needed. It is advisable to consult a mechanic for a more accurate estimate based on the specific situation.