P2583 Adaptive cruise control distance (radar) sensor signal or alignment fault

Cruise Control Distance Sensor Fault

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The fault disables adaptive cruise control and may disable related collision warnings, but the vehicle still drives normally. Honda bulletins tie it to radar alignment, software and a blocked sensor, so it is mostly a driver-assist loss rather than a drivability fault.

It gets more serious if:

  • Inspect soon: Have it checked soon if collision mitigation, lane or braking warnings appear on the dash, because the radar may be disabling those features.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

P2583 in short

P2583 points to a fault with the adaptive cruise control distance sensor, usually the radar behind the grille. Honda bulletins tie it to radar misalignment, a software issue or a loose mounting clip. Adaptive cruise and collision warnings may be off, so do not rely on them until it is checked.

Adaptive cruise control uses a radar unit, often behind the grille or bumper, to measure the distance to the vehicle ahead. The computer sets P2583 when the signal is out of range or the sensor reports a problem.

On Honda vehicles the code appears with sub-codes. P2583-76 relates to radar misalignment, and a 2017 CR-V bulletin links it to a software issue that causes a false Radar Obstructed message and ACC speed fluctuation. If the code returns after the radar is re-aimed, Honda tells technicians to inspect the radar mounting clips and bracket. On an Acura, P2583-97 with a collision mitigation (CMBS) light led to a check for a non-CMBS grille molding.

PartsAvatar lists a faulty sensor, damaged or shorted harness and poor connections as general causes, and a front-end repair that moved the radar can also upset it.

Most likely causes

  1. Radar misaligned or its mounting loose

    Supported by vehicle data
    Why it ranks here
    Honda A18080E says that if P2583-76 persists after the radar is re-aimed, the radar mounting clips and bracket should be inspected.
    What would change this
    Rises after front-end work or a minor impact. Falls if the mount is tight and aligned.

  2. Radar software issue

    Supported by vehicle data
    Why it ranks here
    Honda A17-064 describes a software issue on the 2017 CR-V that sets P2583-76, shows a false Radar Obstructed message and makes ACC speed fluctuate.
    What would change this
    Rises if the vehicle is a covered 2017 CR-V and the radar looks clean and aligned. Falls on other vehicles.

  3. Wrong or non-CMBS grille upper molding in front of the radar

    Supported by vehicle data
    Why it ranks here
    Acura B14020D says a CMBS indicator with P2583-97 should prompt a check for a non-CMBS grille upper molding.
    What would change this
    Rises if the grille or bumper has been replaced with a non-matching part. Falls with original parts.

  4. Dirt, ice or damage covering the radar

    Possible — needs testing
    Why it ranks here
    Honda A17-064 mentions a Radar Obstructed message, so a covered or dirty radar is a simple thing to rule out, though the sources opened do not name it as a cause of the code itself.
    What would change this
    Rises if the code appears in snow, mud or after a bump, and clears after cleaning. Falls if the cover is clean.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. With the vehicle off, wipe the radar area on the grille or bumper clean and check for snow, mud, stickers or damage.

    Low risk

  2. Ask whether the front end was repaired or the bumper or grille replaced, and ask a dealer whether your VIN has an open radar bulletin.

    Low risk

  3. Have a shop check the radar mounting clips and bracket and re-aim the radar to specification.

    Best left to a shopTool: manufacturer scan tool, radar aiming equipment

    Warning:Radar aiming needs manufacturer equipment; do not bend brackets or open the unit.

Symptoms

  • Adaptive cruise control unavailable
  • Radar Obstructed or similar message on the dash
  • Collision mitigation indicator on Gets more serious: stop and have it checked.
  • Speed fluctuating under adaptive cruise

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Body control module (BCM):This is a radar system; the radar sensor itself is not in our components list. Alignment and software are the bulletin causes, so confirm those before replacing the unit. Labor varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Honda

  • 2017–2018 · CR-V

    Supported by vehicle data

    Honda A17-064 ties P2583-76, false Radar Obstructed and ACC speed fluctuation on the 2017 CR-V to a radar software issue, and A18080E tells technicians to inspect the radar mounting clips and bracket if it persists after re-aim on 2017-18 Civic, CR-V, 2018 Accord and 2019 Insight. Whether they are current is not verified.

  • A17-064Status unverified

    Radar software issue: P2583-76, false Radar Obstructed, ACC speed fluctuation

    2017cr-v · NHTSA 10115759

    A software issue can set P2583-76 (misalignment), display a false Radar Obstructed message and cause ACC speed fluctuation.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • A18080EStatus unverified

    P2583-76 persists after radar re-aim: inspect the radar mounting clips and bracket

    2017–2019cr-v, civic, accord, insight · NHTSA 10144375

    If P2583-76 persists after the radar is re-aimed, inspect the radar mounting clips and bracket.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

No curated relationships for P2583 yet.

All Vehicle speed, idle control and engine electrical codes

P2583 questions

Is it safe to drive with P2583?

The vehicle drives normally, but adaptive cruise and collision warnings may be off. Do not rely on them, and keep a safe following distance yourself.

Can a dirty bumper set P2583?

Yes. Mud, snow or a damaged cover over the radar can block it. Clean it first; if the code returns, ask about alignment or software.

Sources and review

  1. Honda A17-064: radar software issue, P2583-76 misalignment and false "Radar Obstructed" on 2017 CR-V — American Honda / NHTSA
  2. Acura B14020D: CMBS indicator on with P2583-97 (check for a non-CMBS grille upper molding) — American Honda / NHTSA
  3. Honda A18080E: P2583-76 that persists after radar re-aim, inspect radar mounting clips and bracket — American Honda / NHTSA
  4. P2583 OBD Code: Cruise Control Front Distance Range Sensor Single Sensor or Center — PartsAvatar
Last reviewed
Written by
Saurabh K.
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