Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble talking to a part that helps control how air flows into the engine. It's like when you can't hear your friend because the phone is broken.
The P059D code is triggered when the vehicle's powertrain control module (PCM) detects a low voltage signal from the active grille air shutter position sensor.
The active grille air shutter system is designed to optimize aerodynamics and improve fuel efficiency by controlling airflow through the radiator. The position sensor monitors the shutters' position and sends this data to the PCM. A 'circuit low' code indicates that the voltage from the sensor is below the expected range, suggesting a possible wiring issue, sensor failure, or PCM problem.
• Check Engine Light illuminated
• Reduced fuel efficiency
• Possible overheating
• Faulty active grille air shutter position sensor
• Damaged or corroded wiring/connectors
• Faulty PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the position sensor for proper function.
• Replace the faulty position sensor.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Silverado
• Ford F-150
• GMC Sierra
• Regularly inspect and clean the grille shutters.
• Ensure wiring and connectors are secure and free from corrosion.
• Keep the vehicle's software updated.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure about repairs.
Check with your vehicle manufacturer; emissions-related components may be covered under warranty.
This code has become more common as vehicles increasingly use active grille air shutters to improve fuel efficiency.
Moderate – While the vehicle may still be drivable, addressing the issue promptly can prevent further damage and ensure optimal performance.
Driving with a Check Engine Light on may lead to increased emissions and could be illegal in some areas.
• Engine running
• Vehicle at operating temperature
The active grille air shutter is typically located at the front of the vehicle, near the radiator.
Q: Can I drive with a P059D code?
A: It's possible to drive with this code, but it's recommended to fix it soon to avoid potential engine performance issues.
Q: What happens if I ignore the P059D code?
A: Ignoring the code can lead to reduced fuel efficiency and possible engine overheating.
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