PIT5841A
Service Bulletin Details
Public Details for: PIT5841A
This preliminary information communicates information on a no crank / no start concern caused by a no fob detected message caused by an internal fault of the bcm. Dealer is to replace the bcm to correct this concern.
Models from 2021
| 2021 BUICK ENVISION |
| 2021 CADILLAC CT4 |
| 2021 CADILLAC CT5 |
| 2021 CADILLAC ESCALADE |
| 2021 CHEVROLET CORVETTE |
| 2021 CHEVROLET SUBURBAN |
| 2021 CHEVROLET TAHOE |
| 2021 GMC YUKON |
Models from 2020
| 2020 CADILLAC CT4 |
| 2020 CADILLAC CT5 |
Bulletin No.: PIT5841A Published date: 09/8/2021 Preliminary Information PIT5841A No Fob Detected Message on DIC with No Crank/No Start Product Investigation Review Required Models Brand: Model: Model Years: VIN: from Engine: to Transmissions: Buick Envision 2021 All All All All Cadillac CT4 2020 - 2021 All All All All Cadillac CT5 2020 - 2021 All All All All Cadillac Escalade 2021 All All All All Chevrolet Corvette 2021 All All All All Chevrolet Suburban 2021 All All All All Chevrolet Tahoe 2021 All All All All GMC Yukon 2021 All All All All Involved Region or Country North America Condition A customer may comment they have a No Crank / No Start condition with a "No Fob Detected" message on the DIC. The RKE key fob will also not be detected in the backup pocket. Key fobs will work actively (button press) but not passively. There are no current passive antenna or Immobilizer DTC’s set in the BCM. The vehicle will have battery power (battery state of charge above 12 volts) but will not power mode to the RUN or Accessory position which will not allow the transmission to be shifted from park. Also, the parking brake may be engaged and not be able to be released. Cause It has been determined that an internal BCM fault causes the fobs to not be recognized and loss of immobilizer. Correction: If you encounter a vehicle with the above concern, perform the following steps: 1. Verify that the Active RKE functions are working for all transmitters (example: Locking/Unlocking/Horn/Trunk and Remote Start). 2. Verify ALL Passive RKE functions are inoperative for both transmitters. 3. Verify Low Frequency (LF) “Passive” Antennas ARE NOT transmitting by using the Service Tool EL-52545. 4. Verify that the Transmitters ARE NOT responding to the Passive Challenge with the Service Tool EL-52545, without pressing any buttons on the transmitters. 5. Is the vehicle's battery above 12V? 6. There should be no current antenna or immobilizer DTC’s set in the BCM. 7. With both transmitters outside of the vehicle, attempt to change the power mode by pressing the start stop switch once every 3 seconds, 5 times. Check for DTC’s in the BCM. There should be no current antenna or immobilizer DTC’s set after performing this step. If questions 1-7 can all be answered as “YES”, replace the BCM. Refer to Service Information / Keyless Entry System Malfunction (Example Document ID: 5606149) for additional diagnostic procedures. NOTE: It may be possible to recover the vehicle from this condition by performing a battery disconnect / reset, allowing the vehicle's modules to completely power down. If the vehicle cannot be recovered and must be towed, ensure proper towing procedures are followed including the use of wheel dollies and atbed towing. Ref: SI Doc: 5500849. Warranty Information For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Description Labor Time *2887308 Diagnose Inoperative Key Fobs, Replace BCM, and Program BCM 1.4 Hr. * This is a unique labor operation for bulletin use only. Version History Version Modi ed 2 05/11/2021 - Created on. 09/08/2021 - Added Additional Makes and Models © 2021 General Motors. All Rights Reserved.