# 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.

- 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181598-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181598-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Trouble codes named

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

## Vehicles listed

- 2018 JEEP COMPASS

## Recalls for the same vehicles and component

- [2018422](/recalls/tc/2018422.md), 2018-08-09: Powertrain

## Other bulletins for the same vehicles and component

- [9100776](/bulletins/11030018.md), 2026-03-13, Service bulletin: POWER TRAIN. 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](/bulletins/11024056.md), 2025-10-08, Service bulletin: POWER TRAIN. 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](/bulletins/10229310.md), 2023-01-09, Service bulletin: POWER TRAIN; STRUCTURE. Valve Body Learn Procedure On WiTech Shows The Transmission Is Not In The Proper Gear After Repairs
- [1808222](/bulletins/10228037.md), 2022-12-19, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN; AIR BAGS; EQUIPMENT; VEHICLE SPEED CONTROL; WHEELS; EXTERIOR LIGHTING. 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](/bulletins/10224601.md), 2022-10-24, Service bulletin: POWER TRAIN. Powertrain Control Module.
- [S1908000102](/bulletins/10224022.md), 2022-10-17, Service bulletin: POWER TRAIN. \(Rev. A\) Power Inverter Load Ratings
- [1809820](/bulletins/10223966.md), 2022-10-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM. 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](/bulletins/10223532.md), 2022-10-17, Service bulletin: POWER TRAIN. Service 4wd Light On, Message AWD System Service Required
- [S2208000073](/bulletins/10223097.md), 2022-10-17, Service bulletin: POWER TRAIN. No Start, After Flash And Or PCM Replace, DTC P0513 Invalid Skim Key Setting
- [0801022](/bulletins/10222982.md), 2022-10-17, Service bulletin: BACK OVER PREVENTION; EXTERIOR LIGHTING; POWER TRAIN; ELECTRICAL SYSTEM. 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.

JSON: [/v1/bulletins/10181598](/v1/bulletins/10181598)

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