Hearth Record

Power train: automatic transmission: park/neutral start interlock switch (Allison)

Vehicle equipment recall 91E-029. NHTSA received GENERAL MOTORS CORP.’s report on Aug 12, 1991.

NHTSA’s own record, on nhtsa.gov

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The short answer

NHTSA received GENERAL MOTORS CORP.’s report on Aug 12, 1991. Copied from NHTSA on Oct 20, 2026.

Every line below is in NHTSA’s own words, with its source beside it.

What’s wrong with it?

IF VEHICLE ENGINE IS STARTED WITH THE TRANSMISSIONSELECTOR IN A DRIVE POSITION WITHOUT SERVICE OR PARKING BRAKES APPLIED, THEVEHICLE WILL MOVE AS SOON AS THE ENGINE STARTS AND COULD RESULT IN A VEHICLECRASH WITHOUT PRIOR WARNING.

AN INCORRECT NEUTRAL START SWITCH WAS INSTALLED ON SOME TRANSMISSIONS WHICH ALLOWS THE TRUCK TO BE STARTED IN A DRIVE POSITION.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 20, 2026. Updated daily.

  • NHTSA’s part: Power train: automatic transmission: park/neutral start interlock switch.

What should you do?

REPLACE THE NEUTRAL START SWITCH IF DETERMINED THAT THE INCORRECT TYPE OF SWITCH WAS INSTALLED.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 20, 2026. Updated daily.

  • How to reach the firm: SYSTEM: AUTOMATIC TRANSMISSIONS.EQUIPMENT DESCRIPTION: ALLISON AUTOMATIC TRANSMISSIONS: AT500, MT600, V730,HT700, OR CLBT700 FOR VARIOUS HEAVY DUTY VEHICLES.

Which ones are recalled?

NHTSA counts 3,250 items potentially involved, across everything this recall names.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 20, 2026. Updated daily.

  • Allison TransmissionBuilt from Apr 1, 1991 to Jun 1, 1991

Who is recalling it?

  • Made by GENERAL MOTORS CORP..
Source:

NHTSA, Recalls flat file before 2010. Released Oct 20, 2026. Updated daily.

What the record doesn’t say

  • NHTSA’s recall file doesn’t say whether anyone was hurt.
  • Which ones, by part or lot: the recall’s report on NHTSA’s site gives them where the maker did; this file gives part numbers only where its maker listed them.
  • How many have been returned or fixed isn’t in the notice.
Source:

Hearth Record wrote these lines.

Sources

Source:

Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 20, 2026.

How to read a record

Four things every record does, shown on an example record made up for this guide.

An example record, made up for this guide

An example nursing home

Made up for this guide: no real place is shown

Not fully inspected in over two years (CMS flag)

11 health citations at the latest inspection cycle

The state average is 14.3.

Source:

CMS, State and US Averages and Health Deficiencies. Released Oct 28, 2026. Updated monthly.

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