p059a p05ff iso sae reserved

P059A: Active Grille Air Shutter “A” Position Sensor Minimum/Maximum Stop Performance

P059B: Active Grille Air Shutter “A” Performance/Stuck Off

P059C: Active Grille Air Shutter “A” Stuck On

P059D: Active Grille Air Shutter “B” Position Sensor Minimum/Maximum Stop Performance

P059E: Active Grille Air Shutter “B” Performance/Stuck Off

P059F: Active Grille Air Shutter “B” Stuck On

p059a – Thermostat Heater Control Circuit High

Severity: Moderate

p05ff – ISO/SAE Reserved

Severity: Informational

Common Causes

p059a – Thermostat Heater Control Circuit High

p05ff – ISO/SAE Reserved

This code is reserved by ISO/SAE and its specific meaning may vary depending on the manufacturer.
Contact the vehicle manufacturer for more information about this code.

Common Misdiagnosis

OBD2 Code: P059A

Description: Active Grille Air Shutter “A” Performance

Common Misdiagnosis: Faulty grille shutter motor or actuator is often misdiagnosed as a wiring issue.

OBD2 Code: P059B

Description: Active Grille Air Shutter “B” Performance

Common Misdiagnosis: Incorrectly replacing the grille shutter assembly instead of addressing electrical connection problems.

OBD2 Code: P059C

Description: Active Grille Air Shutter “A” Stuck On

Common Misdiagnosis: Replacing the motor without checking for debris or obstruction in the grille shutters.

OBD2 Code: P059D

Description: Active Grille Air Shutter “B” Stuck On

Common Misdiagnosis: Assuming a mechanical failure when it could be an electrical fault causing the issue.

Common Diagnostic Steps

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OBD2 Code: P059A

Description: Active Grille Air Shutter “A” Performance

Check for any visible damage or obstruction in the grille shutter system.
Inspect the wiring and connectors for signs of damage or corrosion.
Use a scan tool to command the grille shutters open and closed, verifying operation.
Test the grille shutter motor for proper voltage and ground signals.
Examine related fuses and relays for functionality.

OBD2 Code: P059B

Description: Active Grille Air Shutter “B” Performance

Visually inspect grille shutter “B” for obstructions or physical damage.
Check electrical connections at the grille shutter actuator for security and cleanliness.
Utilize a diagnostic scanner to operate the shutters, confirming they respond correctly.
Measure voltage supply and ground at the actuator with a multimeter.
Review vehicle service bulletins that may relate to this issue.
OBD2 Code: P05FF

Description: ISO/SAE Reserved
- This code is reserved by ISO/SAE standards and typically not used in standard diagnostics. If encountered, consult manufacturer-specific resources or technical support.