Service bulletin 18-001-21

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10215932
Published by NHTSA	2022-07-18
Manufacturer's number	18-001-21
Manufacturer's date	2021-01-14
NHTSA component	EXTERIOR LIGHTING; ELECTRICAL SYSTEM; PARKING BRAKE

NHTSA's summary

Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following DTC.P1614-00 - ECU Reset-Recovery Occurred(North America Only). Customers may experience a message on the instrument cluster stating "Speed Limiter Ready" after the first press of thespeed limiter button and the Active Vehicle Speed Limiter (AVSL) is inoperative(Sales Code NH2).Inform the customer after the software update that the proper operative will be when thecustomer presses the speed limiter button twice a message on the instrument cluster stating "Speed limiter ready" and the AVSL feature will workcorrectly(Sales Code NH2).

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes, Electrical system, Lighting, Parking brake

Trouble codes named

P1614

Vehicles listed
JEEP CHEROKEE	2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
S2108000170	2023-01-17. Service bulletin. Head unit button stuck DTC code B14DA-2A
1805620	2023-01-09. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may also experience the following condition:When the cruise control is engaged and the Active Vehicle Speed Limiter (AVSL) button is pressed, Instrument Panel Cluster (IPC) display skips ?Cruise Control Canceled? message and displays ?Speed Limiter Ready?. In addition the following software enhancement are included:Improved idle after a hot restart.
1807922	2022-12-19. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following DTCs have been set: P1D83 - Implausible Engine Oil Temperature Signal Received. P2610 - PCM Internal Engine Off Timer Performance. Customers may experience one or more of the following: An audible clunk after applying throttle from a coasting condition, predominantlyin fifth and sixth gear while driving 48 - 72 kph (30 - 45 mph). Software was updated to better address this condition. A message on the instrument cluster stating ?Speed limiter ready? afterthe first press of the speed limiter button and the Active Vehicle Speed Limiter (AVSL) is inoperative(Equipped with NH2 Sales Code Only). Inform the customer after the software update thatthe proper operative will be when the customer presses the speed limiter button twice, a messageon the instrument cluster stating ?Speed limiter ready? and the AVSL feature will work correctly (Equipped with NH2 Sales Code Only).
1808520REVA	2022-10-17. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC).P2610 - PCM Internal Engine Off Timer Performance. Customers may experience one or more of the following:An audible clunk after applying throttle from a coasting condition, predominantly in fifth and sixth gear while driving 48 - 72 kph (30 - 45 mph). A message on the instrument cluster stating ?Speed limiter ready? after the first press of the speed limiter button and the Active Vehicle Speed Limiter (AVSL) is inoperative(Equipped with NH2 Sales Code Only).Inform the customer after the software update that the proper operative will be when the customer presses the speed limiter button twice, a message on the instrument cluster stating ?Speed limiter ready?and the AVSL feature will work correctly (Equipped with NH2 Sales Code Only).
1805620	2022-09-26. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may also experience the following condition:When the cruise control is engaged and the Active Vehicle Speed Limiter (AVSL) button is pressed, Instrument Panel Cluster (IPC) display skips ?Cruise Control Canceled? message and displays ?Speed Limiter Ready?. In addition the following software enhancement are included:Improved idle after a hot restart.
S2108000170	2022-09-26. Service bulletin. Head unit button stuck DTC code B14DA-2A
18-090-21	2021-12-13. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs): P2172 - High Airflow/Vacuum Leak Detected (Instantaneous Accumulation). P02EE - Cylinder 1 Injector Circuit Performance. P02EF - Cylinder 2 Injector Circuit Performance. P02F0 - Cylinder 3 Injector Circuit Performance. P02F1 - Cylinder 4 Injector Circuit Performance. Customers may also experience the following condition:When the cruise control is engaged and the Active Vehicle Speed Limiter (AVSL) button is pressed, Instrument Panel Cluster (IPC) display skips ?Cruise Control Canceled? message and displays ?Speed Limiter Ready?. In addition the following software enhancement are included:Improved idle after a hot restart.
18-001-21	2021-02-16. Service bulletin. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following DTC.P1614-00 - ECU Reset-Recovery Occurred(North America Only). Customers may experience a message on the instrument cluster stating "Speed Limiter Ready" after the first press of thespeed limiter button and the Active Vehicle Speed Limiter (AVSL) is inoperative(Sales Code NH2).Inform the customer after the software update that the proper operative will be when thecustomer presses the speed limiter button twice a message on the instrument cluster stating "Speed limiter ready" and the AVSL feature will workcorrectly(Sales Code NH2).