P2591
Cruise Control Front Distance Range Sensor Left
Adaptive cruise control
Generic OBD-II
Low
What it means
P2591 means the adaptive cruise control system has flagged a fault with the left front distance range sensor — the radar/laser sensor that measures the gap to the vehicle ahead. Adaptive cruise and related collision-warning features may switch off, but the engine and normal braking are unaffected. The usual culprit is a blocked, misaligned, or wiring-faulted sensor.
Low
Can I keep driving? Safe to drive — adaptive cruise and forward-collision features may be disabled, but the engine and normal braking are unaffected.
Common symptoms
What you'll notice
- Check-engine or driver-assist warning light on
- Adaptive cruise control unavailable or drops out
- Forward-collision warning or auto-braking disabled
- Cruise won't hold a set gap to the car ahead
Common causes
Most likely first
- Dirt, ice, snow, or debris blocking the distance (radar) sensor behind the grille or bumperLikely
- Sensor knocked out of alignment after minor front-end impact or bumper workCommon
- Faulty left front distance range sensorCommon
- Wiring or connector fault at the sensor (open, short, corrosion)Less often
- Calibration or software issue in the adaptive cruise moduleLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and confirm it's the left front distance sensor; check for related U-codes.
- Clean the sensor face and grille area — remove snow, mud, badges, or aftermarket covers.
- Inspect the sensor and bracket for impact damage or misalignment; check bumper fit.
- Inspect the sensor connector and wiring for damage or corrosion; repair as needed.
- If the sensor is intact, it may need aiming/recalibration or replacement with a scan tool.
FAQ
Quick answers
Is it safe to drive with P2591?+
Yes. You lose adaptive cruise and some collision-assist features, but the engine, transmission, and normal braking work fine. Just drive without relying on those aids until it's fixed.
Can I just clear P2591?+
You can, but it returns if the sensor is still blocked, misaligned, or wiring-faulted. Clean the sensor first — that alone often fixes it.
Related codes
Often seen with P2591
Read & clear P2591 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX