P059B: Active Grille Air Shutter A Position Sensor Range or Performance

What it means

Same as P059A with feedback in plausible range yet not matching the commanded angle.

At a glance

• Usually lights the check-engine light

How it works

The position sensor for active grille shutter A reports how far that shutter has moved. P059B sets when the reported position is within an electrically plausible range but does not track the commanded angle, which can point to a misaligned sensor, binding linkage, or worn mechanism.

Common causes

Most likely first.

1. Faulty or misaligned grille-shutter position sensor
2. Shutter linkage binding or wear
3. Damaged or corroded wiring or connector
4. Fault in the shutter control module

Symptoms

• Check-engine light
• Active grille shutter warning, if equipped
• Shutters may move incorrectly or remain in one position

How to diagnose it

1. Use a scan tool to compare commanded and reported positions for grille shutter A and review freeze-frame data for when they began to differ.
2. Inspect shutter A's sensor mounting, connector, and wiring for misalignment, corrosion, damage, or loose pins.
3. Check the A shutter linkage and panels for debris, wear, obstruction, or binding through their movement.
4. Command the shutters with a scan tool if supported and watch whether A moves smoothly and its sensor reading follows the command.
5. If movement and wiring are sound, test sensor A and the shutter control module against the manufacturer's specification.

Common fixes

• Remove debris and free a binding grille-shutter A linkage.
• Correct a misaligned sensor or shutter linkage.
• Repair damaged wiring or connector terminals at sensor A.
• Replace a worn shutter mechanism or faulty position sensor after confirming the mismatch.

Can I keep driving?

You can usually drive if the engine stays at a normal temperature, but monitor the gauge, especially in slow traffic or hot conditions. A shutter stuck closed can reduce cooling airflow.