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Chevrolet Automatic Collision Prep Reduced

Automatic Collision Prep Reduced

DriveNot yet established by verified evidence. The bulletin indicates that most FAB/FPB functions are disabled when the system is set to Alert.
ChargeNot yet established by verified evidence.
ServiceContact a Chevrolet dealer or qualified service provider if the alert remains when FAB/FPB is not set to Alert, or if you need help confirming the vehicle’s driver-assistance settings.
Confidence90%

Quick answer

On covered Chevrolet vehicles, “Automatic Collision Prep Reduced” is an OEM alert that official GM/NHTSA communications associate with Forward Automatic Braking (FAB) or Front Pedestrian Braking (FPB), when equipped, being set to “Alert.” That setting disables most FAB/FPB functions. The bulletin describes this as normal for that setting.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does Automatic Collision Prep Reduced mean?

On covered Chevrolet vehicles, “Automatic Collision Prep Reduced” is an OEM alert that official GM/NHTSA communications associate with Forward Automatic Braking (FAB) or Front Pedestrian Braking (FPB), when equipped, being set to “Alert.” That setting disables most FAB/FPB functions. The bulletin describes this as normal for that setting.

2. Technical explanation

GM bulletin PIT5551 states that some vehicles may display “Automatic Collision Prep Reduced,” a “Forward Collision System Reduced” message, or an amber Automatic Emergency Braking Disable icon at startup. The bulletin says this occurs when FAB or FPB, if equipped, is set to “Alert.” The “Alert” setting disables most FAB or FPB functions. The bulletin identifies three FAB/FPB selections: OFF, Alert, and Alert and Brake. Verified evidence does not establish other causes for this alert.

3. What system is affected?

Forward Automatic Braking (FAB) and/or Front Pedestrian Braking (FPB), if equipped; related instrument-panel/DIC warning display.

4. How serious is this code?

Unknown. The supplied diagnostic record does not establish a severity rating. However, the official bulletin states that the Alert setting disables most FAB/FPB functions.

5. Symptoms you may notice

  • “Automatic Collision Prep Reduced” message may be displayed.
  • “Forward Collision System Reduced” message may be displayed.
  • An amber Automatic Emergency Braking Disable icon may illuminate in the instrument panel.
  • The condition may be noticed when starting the vehicle.

6. Possible causes

  • FAB or FPB, when equipped, has been set to “Alert.” This is the cause identified in GM bulletin PIT5551.
  • Other causes are not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. The bulletin indicates that most FAB/FPB functions are disabled when the system is set to Alert.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Review the vehicle’s Forward Automatic Braking/Front Pedestrian Braking setting using the owner’s manual for the specific vehicle.
  • Be aware that, according to the bulletin, the Alert setting disables most FAB/FPB functions.
  • Use normal attentive driving and do not rely on unavailable or reduced automatic braking functions.

10. Step-by-step troubleshooting

  1. Confirm whether the vehicle is equipped with FAB and/or FPB.
  2. Check whether FAB/FPB is set to “Alert.”
  3. If the setting is Alert, GM bulletin PIT5551 describes the displayed message or amber icon as normal for that selection.
  4. If the setting is not Alert, or the message persists after confirming settings, further cause is not established by the supplied verified evidence.

11. When to contact service

Contact a Chevrolet dealer or qualified service provider if the alert remains when FAB/FPB is not set to Alert, or if you need help confirming the vehicle’s driver-assistance settings.

12. What the service center may check

  • Verify vehicle equipment and applicable FAB/FPB configuration.
  • Verify whether FAB/FPB is set to OFF, Alert, or Alert and Brake.
  • For a message occurring with the Alert setting, PIT5551 identifies the condition as normal.

13. Possible repair or resolution

  • No repair is identified by GM bulletin PIT5551 when FAB/FPB is set to Alert; the bulletin states this condition is normal for that setting.
  • A repair for other circumstances is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM PIT5551R / NHTSA Manufacturer Communication 11016990, published April 12, 2025.
  • GM PIT5551Q / NHTSA Manufacturer Communication 11014450, published February 18, 2025.
  • GM PIT5551P / NHTSA Manufacturer Communication 11011406, published October 1, 2024.
  • GM PIT5551N / NHTSA Manufacturer Communication 10251704, published February 21, 2024.
  • GM PIT5551M / NHTSA Manufacturer Communication 10247351, published November 9, 2023.
  • GM PIT5551L / NHTSA Manufacturer Communication 10242314, published August 29, 2023.
  • GM PIT5551K / NHTSA Manufacturer Communication 10240792, published July 18, 2023.
  • GM PIT5551J / NHTSA Manufacturer Communication 10232835, published February 24, 2023.
  • GM PIT5551H / NHTSA Manufacturer Communication 10230691, published December 12, 2022.
  • GM PIT5551F / NHTSA Manufacturer Communication 10182540, published October 7, 2020.

16. Recall information

  • No recall information was supplied as verified evidence.

17. Official manufacturer information

Official NHTSA-hosted GM communications cite PIT5551 and its revisions. The supplied applicability data identifies U.S. Chevrolet Blazer, Bolt EV, Equinox, and Volt entries spanning model years 2016–2025, with overlapping year ranges. Exact applicability for an individual vehicle should be confirmed by VIN and equipment.

19. Frequently asked questions

What does “Automatic Collision Prep Reduced” mean?

GM bulletin PIT5551 associates the message with FAB or FPB, when equipped, being set to Alert. That setting disables most FAB/FPB functions.

Is this message always a fault?

No. The bulletin states it is normal when FAB or FPB is set to Alert.

What setting avoids the normal Alert-setting message?

The bulletin identifies OFF, Alert, and Alert and Brake selections. It states that Alert disables most functions; it does not provide further vehicle-specific operating instructions in the supplied evidence.

Does this affect EV charging?

Not yet established by verified evidence.

20. Sources & verification

Verified
Chevrolet Automatic Collision Prep Reduced: Automatic Collision Prep… | EV Diagnostics