P151E 2014 GMC Sierra 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 2014 GMC Sierra 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.
Code P151E 2014 GMC Sierra Description
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
What are the Possible Causes of the DTC P151E 2014 GMC Sierra?
- 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 2014 GMC Sierra?
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 P151E 2014 GMC Sierra 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 P151E 2014 GMC Sierra code?
Need more information on how to fix the P151E 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P151E 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P151E 2014 GMC Sierra Code
1. What does the OBDII code P151E mean on a 2014 GMC Sierra?
P151E indicates an issue with the Active Grille Air Shutter Actuator 1, specifically a signal message counter error where the control module isn't receiving the expected signal.
2. What are the symptoms of a P151E code in a 2014 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine cooling, or aerodynamic inefficiency.
3. What causes a P151E code to appear?
The code can be triggered by a faulty grille shutter actuator, damaged wiring or connectors, a communication error between the actuator and the control module, or a malfunctioning control module.
4. Can I drive my 2014 GMC Sierra with a P151E code?
While the vehicle may still be drivable, it’s recommended to address the issue promptly as it can affect fuel economy and engine cooling.
5. How do I fix a P151E code on my GMC Sierra?
Repairs may involve inspecting and repairing damaged wiring, reconnecting loose connectors, replacing the grille shutter actuator, or reprogramming the control module.
6. How can I diagnose a P151E code?
Use an OBDII scanner to confirm the code, then inspect the grille shutter actuator, associated wiring, and connectors for damage or disconnection.
7. What tools are needed to fix a P151E code?
You’ll need an OBDII scanner, a multimeter for electrical testing, and basic hand tools for removing and inspecting components.
8. How much does it cost to repair a P151E code?
The cost varies depending on the issue, but replacing the grille shutter actuator typically ranges from $200 to $500, including parts and labor.
9. Can a P151E code be caused by software issues?
Yes, outdated or corrupted software in the control module can cause communication errors, so reprogramming may resolve the issue.
10. Does a P151E code affect engine performance?
Not directly, but it can lead to less efficient cooling and aerodynamics, which may indirectly impact overall performance and fuel economy.
Discuss the causes and fixes for P151E 2014 GMC Sierra OBDII Code
Code P151E 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
