What it means
Same as P059A with intermittent signal. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
Active Grille Air Shutter A is a movable grille assembly, and its position sensor reports shutter movement to the control module. This code sets when the sensor signal becomes intermittent instead of tracking position steadily, often as the connector or harness moves with vibration.
Common causes
Most likely first.
- Intermittent contact at connector
- Connector with intermittent contact under vibration
- Harness routed against vibrating component
Symptoms
- Check-engine light
- Active grille shutter warning, if equipped
- Shutters may operate intermittently
How to diagnose it
- Save freeze-frame data and monitor Shutter A position live while commanding movement to identify when the feedback drops out.
- Inspect the sensor connector for loose or corroded terminals, moisture, damaged seals, and pins that have backed out.
- With live data displayed, gently wiggle the sensor connector and harness to reproduce a dropout.
- Trace the harness where it touches or passes near vibrating parts, and check for chafing, strain, or loose clips.
- If the harness and connections are secure, test sensor output and circuit continuity while moving the harness, following the manufacturer's procedure.
Common fixes
- Reseat and secure a loose Shutter A sensor connector.
- Clean or replace corroded terminals and restore a damaged connector seal.
- Repair chafed wiring and reroute or clip the harness clear of vibrating parts.
- Replace the position sensor if its output drops out with stable wiring and connections.
Can I keep driving?
You can usually drive if engine temperature stays normal, but the shutters may stop responding or remain in one position. Monitor the temperature gauge and stop if the engine overheats.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.