Service bulletin 18-050-20

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	10176592
Published by NHTSA	2020-06-22
Manufacturer's number	18-050-20
Manufacturer's date	2020-05-30
NHTSA component	POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM

NHTSA's summary

Powertrain Control Module (PCM) Replacement - P2172 - High Airflow/Vacuum Leak Detected (Instantaneous Accumulation) This bulletin involves replacing the Powertrain Control Module (PCM) and re-programming with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find the following Diagnostic Trouble Code (DTC) set in the PCM memory:P2172 - High Airflow/Vacuum Leak Detected (Instantaneous Accumulation).

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

Electrical system, Transmission and driveline, Automatic transmission, Transmission control module

Trouble codes named

P2172

Vehicles listed
DODGE CHALLENGER	2019
DODGE CHARGER	2019
JEEP GRAND CHEROKEE	2019

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
1810023	2024-01-08. Service bulletin. Flash: Powertrain Control Module (PCM) Updates 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) has been set: ?P0441 - EVAP Purge System Performance (for North America and Mexico markets only). ? P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present, use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. This bulletin involves reprogramming the PCM with the latest available software.
1810023	2023-10-30. Service bulletin. Flash: Powertrain Control Module (PCM) Updates 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) has been set: ?P0441 - EVAP Purge System Performance (for North America and Mexico markets only). ? P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present, use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. This bulletin involves reprogramming the PCM with the latest available software.
S1808000152	2023-04-17. Service bulletin. CEL (Check Engine Lamp) Illuminates, Recent PCM Replace or Flash Update Performed, Diagnostic Trouble Codes (DTCs) P057B Brake Pedal Position Sensor Circuit Performance, P1572 Brake Pedal Stuck, C0042-54 Brake Pedal Missing Calibration
1815022	2023-01-23. Service bulletin. Powertrain Control Module (PCM) Updates
1807422	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 that one or moreof the following DTCs have been set: P0452 - EVAP Pressure Switch Stuck Closed. P0455 - EVAP System Large Leak. P0440 - General EVAP System Failure. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak VerificationTest (SLVT) to determine if a leak is present in the system. Customers may also comment on one or more of the following: Vehicle will fail to start when cold at times. Noise heard from the drivetrain while stationary and vehicle is in Sport/Track modes.
1806422	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 that one or moreof the following DTCs have been set: P0452 - EVAP Pressure Switch Stuck Closed. P0455 - EVAP System Large Leak. P0440 - General EVAP System Failure. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. Customers may also experience the following:Vehicle willfail to start when cold at times. Noise heard from the drivetrain while stationary and vehicle is in Sport/Trackmodes. Extended engine crank times.
S1508000323REVA	2022-09-26. Service bulletin. PCM Sets DTC P1400-Aftermarket Calibration Detected/Warranty Coverage Confirmation Required
1806422	2022-09-26. 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 that one or moreof the following DTCs have been set: P0452 - EVAP Pressure Switch Stuck Closed. P0455 - EVAP System Large Leak. P0440 - General EVAP System Failure. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. Customers may also experience the following:Vehicle willfail to start when cold at times. Noise heard from the drivetrain while stationary and vehicle is in Sport/Trackmodes. Extended engine crank times.
1806622	2022-09-26. 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 that one or moreof the following DTCs have been set: P0452 - EVAP Pressure Switch Stuck Closed. P0455 - EVAP System Large Leak. P0440 - General EVAP System Failure. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. Customers may also experience one or more of the following: Vehicle will fail to start when cold at times. Noise heard from the drivetrain while stationary and vehicle is in Sport/Trackmodes. Extended engine crank times.
S1925000008	2022-06-27. Service bulletin. Malfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes (DTCs) P208B ? Reductant Pump 1 Control Performance, and/or P20E8 ? Reductant Pressure Too Low, Set.