AutoCodes – GMC – P151E GMC

P151E GMC Code - Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect

Quick Answer

The active grille air shutter system closes shutters in the front grille to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front-end airflow are not required. Common causes include Faulty Active Grille Air Shutter Actuator, Active Grille Air Shutter Actuator harness is open or shorted, Active Grille Air Shutter Actuator 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: P151E GMC indicates Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Active Grille Air Shutter Actuator, Active Grille Air Shutter Actuator harness is open or shorted, Active Grille Air Shutter Actuator 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 12,482

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 Jul 14, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P151E GMC Description

The active grille air shutter system closes shutters in the front grille to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front-end airflow are not required. If high levels of airflow are required, the active grille air shutter system will open one or both shutters. The control signal from the Engine Control Module (ECM), ignition, and ground circuits enable the active grille air shutter actuators to operate. If the conditions for opening the shutters are reached the ECM commands the active grille air shutter actuators to open one or both shutters.
The dual active grille air shutter system consists of two aero shutter mechanisms located in the front grille for controlling the amount of air flowing through the grille. It includes three wires; ground, power, and a Local Interconnect Network (LIN) Bus serial data circuit from the ECM to the shutter actuator. The ECM determines shutter state based on various vehicle conditions such as vehicle speed, coolant temperature, fan state, refrigerant system pressure, A/C compressor state, and ambient temperature. The ECM has the ability to command each shutter individually to the open or closed positions through communications on the LIN Bus.
The actuators are powered by an ignition circuit that is active when the key is in the RUN position. The vehicle may have to be driven for up to 13 minutes at speeds greater than 41 km/h (25 mph) before a shutter begins to move. If low ambient temperature is detected, the shutters will remain in the closed position.
The Diagnostic Trouble Code (DTC) will be set if there a LIN Bus Communication Malfunction

OBDII Code P151E GMC - Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect - AutoCodes.com — P151E GMC Code - Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151E GMC?

Faulty Active Grille Air Shutter Actuator
Active Grille Air Shutter Actuator harness is open or shorted
Active Grille Air Shutter Actuator circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P151E GMC?

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 does this mean?

Code Tech Notes

The aero shutters on some 2019-2021 Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon, Escalade; 2020-2021 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models may have several conditions that could potentially cause improper shutter operation. Several DTCs may be set, depending on the specific conditions. When checking aero shutter operation, be sure to look for electrical integrity issues, displaced louvers/vanes, and debris that may block movement.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P151E GMC 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 GMC Models

P151E 2014 GMC Sierra — Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect
P151E 2015 GMC Sierra — Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect
P151E 2016 GMC Sierra — Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect
P151E 2017 GMC Sierra — Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect
P151E 2018 GMC Sierra — Active Grille Air Shutter Actuator 1 Signal Message Counter Incorrect

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 P151E GMC Code

1. What are the common symptoms of OBDII code P151E GMC?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and the vehicle's grille shutters not functioning properly.

2. What does OBDII code P151E GMC mean?

- OBDII code P151E GMC indicates that the signal message counter for the Active Grille Air Shutter Actuator 1 is incorrect.

3. What are the possible causes of OBDII code P151E GMC?

- Possible causes include a faulty grille air shutter actuator, wiring issues, a defective actuator control module, or a communication error within the system.

4. How can I diagnose the cause of OBDII code P151E GMC?

- Diagnosis typically involves inspecting the wiring and connectors related to the grille air shutter actuator, testing the actuator itself, and checking for any communication faults using a diagnostic scan tool.

5. Can I continue driving with OBDII code P151E GMC?

- It is not recommended to continue driving with this code active, as it can lead to further damage and potentially affect the vehicle's performance.

6. How can OBDII code P151E GMC be repaired?

- Repair may involve replacing the faulty grille air shutter actuator, repairing any damaged wiring or connectors, reprogramming the actuator control module, or addressing any communication issues in the system.

7. Are there any DIY tips for fixing OBDII code P151E GMC?

- DIY repair is possible for those with automotive experience. Ensure to follow proper diagnostic procedures, use the correct tools, and refer to the vehicle's service manual for guidance.

8. How much does it cost to repair OBDII code P151E GMC at a mechanic?

- Repair costs can vary depending on the specific issue causing the code, but it may range from $200 to $500 at a mechanic, including parts and labor.

9. Can resetting the OBDII system clear OBDII code P151E GMC?

- Resetting the OBDII system may temporarily clear the code, but it is likely to return if the underlying issue is not addressed and repaired.

10. How can I prevent OBDII code P151E GMC from reoccurring?

- Regular maintenance, timely repairs of related components, and addressing any issues promptly can help prevent OBDII code P151E GMC from reoccurring.