Service bulletin 18-078-20

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	10181598
Published by NHTSA	2020-10-26
Manufacturer's number	18-078-20
Manufacturer's date	2020-09-04
NHTSA component	POWER TRAIN

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 that one or more of the following DTCs have been set:DTC P1DD2 will be stored in the Transmission Control Module (TCM) however no DTCs will be stored in the PCM. Verify no unrelated codes are stored in the PCM before flashing. If codes are stored in the PCM, normal diagnosis should be performed.B25C9 - Driver Door Ajar Switch 2 Stuck Closed. P061A - Level 2 Torque Performance. P06E9 - Engine Starter Performance(North America Only). C050D - Wheel Speed Signal Left Rear Rationality. C0501 - Wheel Speed Signal Left Front Rationality. C0507 - Wheel Speed Signal Right Front Rationality. C0513 - Wheel Speed Signal Right Rear Rationality. P1DD2 - Torque Request Signal From TCM Denied will be present, set by the TCM and the vehicle will be in limp home mode(Sales Codes DF5 and DF7 - Automatic Transmission Vehicles Only). U1428 - Inaccurate Engine Torque Received(Sales Codes DF5 and DF7 Only). Customers may also comment on one of the following:Poor shift quality. Lack of vehicle speed. Vehicle will intermittently not start(South Korea Only). The vehicle is in limp home mode (shift RPMs are limited) with no DTCs set(Sales Code DE1 - Manual Transmission Vehicles Only).

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

Trouble codes named

B25C9, C0501, C0507, C050D, C0513, P061A, P06E9, P1DD2, U1428

Vehicles listed
JEEP COMPASS	2018

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

Recalls for the same vehicles and component
2018422	2018-08-09. Powertrain

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
9100776	2026-03-13. Service bulletin. Before replacing the RDM, please be aware that NVH from differential gears is typical and within the acceptable limits. Do not replace RDM for NVH issue.
21-040-25	2025-10-08. Service bulletin. 948TE Transmission Reaction Shaft Service Bushing Kit Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): ● P1DB7-00 - Torque Converter Clutch Performance.
S2021000004	2023-01-09. Service bulletin. Valve Body Learn Procedure On WiTech Shows The Transmission Is Not In The Proper Gear After Repairs
1808222	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 more of the following DTCs have been set: DTC P1DD2 will be stored in the Transmission Control Module (TCM) however no DTCs will be stored in the PCM. Verify no unrelated codes are stored in the PCM before flashing. If codes are stored in the PCM, normal diagnosis should be performed.B25C9 - Driver Door Ajar Switch 2 Stuck Closed. P061A - Level 2 Torque Performance. P06E9 - Engine Starter Performance(North America Only). C050D - Wheel Speed Signal Left Rear Rationality. C0501 - Wheel Speed Signal Left Front Rationality. C0507 - Wheel Speed Signal Right Front Rationality. C0513 - Wheel Speed Signal Right Rear Rationality. P1DD2 - Torque Request Signal From TCM Denied will be present, set by the TCM and the vehicle will be in limp home mode(Sales Codes DF5 and DF7 - Automatic Transmission Vehicles Only). U1428 - Inaccurate Engine Torque Received(Sales Codes DF5 and DF7 Only). Customers may also comment on one of the following:Long engine cranking prior to vehicle start more noticeable when the outside temperature is above 40°c (104°f)(EMEA with Sales Code ED6 only). Poor shift quality. Lack of vehicle speed. Vehicle will intermittently not start(South Korea Only). The vehicle is in limp home mode (shift RPMs are limited) with no DTCs set (Sales Code DE1 - Manual Transmission Vehicles Only).
W20	2022-10-24. Service bulletin. Powertrain Control Module.
S1908000102	2022-10-17. Service bulletin. (Rev. A) Power Inverter Load Ratings
1809820	2022-10-17. Service bulletin. Flash: Powertrain Control Module (PCM) Updates - AN-M4-20200919 Refer to China Joint Venture (JV) released document AN-M4-20200919 for details on this service action.
S1721000016	2022-10-17. Service bulletin. Service 4wd Light On, Message AWD System Service Required
S2208000073	2022-10-17. Service bulletin. No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting
0801022	2022-10-17. Service bulletin. Flash: Drivetrain Control Module (DTCM) Updates This bulletin involves reprogramming the DTCM with the latest available software. The customer may describe one or more of the following: Noise while disconnecting the 4WD at speeds around 56 kph (35 mph). A hum, chatter or growl noise heard intermittently at speeds approximately between 48-72 kph (30-45 mph). Upon further investigation the technician may find that the following Diagnostic Trouble Code (DTC) is active or stored:C2502-64 - Status ECM Tcfailsts Or Transm2 Transmissionfailsts Or Brake8 Dstfailsts Or Brake8 Escfailsts Or Status ECM Emsfailsts Or Ge Electricsteeringfailsts - Signal Plausibility Failure. DTC C2502-64 may be active or stored in the DTCM due to other OBD DTC?s with the Transmission Control Module (TCM) or Powertrain Control Module (PCM). The DTC will not turn on a Malfunction Indicator Lamp (MIL) light.