Service bulletin S2321000009

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	10248583
Published by NHTSA	2024-01-08
Manufacturer's number	S2321000009
Manufacturer's date	2023-09-29
NHTSA component	POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

NHTSA's summary

MIL On with TCM P1DB7 Active

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

Transmission and driveline, Automatic transmission, Transmission control module

Trouble codes named

P1DB7

Vehicles listed
JEEP GRAND CHEROKEE	2022, 2023
RAM 1500	2022, 2023

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

Recalls for the same vehicles and component
26V413000	2026-06-30. POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL)
24V413000	2024-06-06. POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
S2309000012	2024-01-16. Service bulletin. Mil-On/Check Engine Lamp-On with DTC P06DD set in the powertrain control module (PCM).
S2321000009	2024-01-16. Service bulletin. Malfunction Indicator Lamp (MIL) Illuminated. Active Diagnostic Trouble Code (DTC) P1DB7-00 ? Torque Converter Clutch Performance, Set.
1800123	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 that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ?P1524 - Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled. ? P219A - Bank 1 Air-Fuel Ratio Imbalance. ? U0402-00 Implausible Data Received from the TCM. (When U0402-00 sets in the PCM, the module will start to deny torque requests from the Transmission Control Module (TCM). The transmission will fault and go to a fixed gear limp-inreaction, and send the MIL request to PCM.) The customer may also experence the following: ? A limp mode when the DTC sets in the PCM. This bulletin involves reprogramming the PCM with the latest available software.
1809823	2024-01-08. Service bulletin. Flash: Powertrain Control Module (PCM) Update Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ?P1524 - Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled. ? P219A - Bank 1 Air-Fuel Ratio Imbalance. This bulletin involves reprogramming the PCM with the latest available software.
1801323	2024-01-08. Service bulletin. Flash: Powertrain Control Module (PCM) Updates Customers may experience one or more of the following: ? Engine must be started twice to achieve drive ready (at low temperatures around -30°C, -22°F) when the vehicle was entered and started quickly. ??Performance Limited, Service Fuel System? popup while driving. ? Unable to enter electric mode driving while Fuel Oil Refresh Mode (FORM) is active. This bulletin involves reprogramming the PCM with the latest available software NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this HCP and AHCP update: ? Transmission Control Module (TCM). ? Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) also known as Power Inverter Module (PIM) module.
1809923	2024-01-08. Service bulletin. Flash: Powertrain Control Module (PCM) Update Customers may experience the following: ? Poor fuel economy. This bulletin involves reprogramming the PCM with the latest available software.
S2308000118	2024-01-08. Service bulletin. Malfunction Indicator Lamp (MIL) on, P0052, P0152, O2 Sensor High, P0113 Intake Air Sensor (IAT)
S2321000005	2024-01-08. Service bulletin. Transmission Fluid Leak From Under The Vehicle.
1800123	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 that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ?P1524 - Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled. ? P219A - Bank 1 Air-Fuel Ratio Imbalance. ? U0402-00 Implausible Data Received from the TCM. (When U0402-00 sets in the PCM, the module will start to deny torque requests from the Transmission Control Module (TCM). The transmission will fault and go to a fixed gear limp-inreaction, and send the MIL request to PCM.) The customer may also experence the following: ? A limp mode when the DTC sets in the PCM. This bulletin involves reprogramming the PCM with the latest available software.
1809823	2023-10-30. Service bulletin. Flash: Powertrain Control Module (PCM) Update Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ?P1524 - Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled. ? P219A - Bank 1 Air-Fuel Ratio Imbalance. This bulletin involves reprogramming the PCM with the latest available software.