# Service bulletin 9004408

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: 10219923
- Published by NHTSA: 2022\-09\-15
- Manufacturer's number: 9004408
- Manufacturer's date: 2021\-08\-18
- NHTSA component: POWER TRAIN

## NHTSA's summary

MODULE, Transfer Case Control \(DTCM\) If there are any ECU's being updated for Software updates this will cause an interuption in CAN communication which in combined with a shortened key cycle \(CAN communication is still alive\) can cause the C1472\-92 DTCM Fault. If Vehicle sets C1472\-92 verify the diagnostics by the following: \(1.\) Take Vehicle Scan to verify DTC is Active/Stored. Send to Tech Advisor to record DTC snapshot information. If Vehicle sets C1472\-92 verify the repair by the following: \(1.\) Verify there are no Ground loose connections / concerns \(G910A\) by ensuring the ground stud securement is correct. \(2.\) Complete sleep cycle. Allow DTCM to fully shutdown. PRDNL lights will no longer illuminate. \(3.\) After complete shutdown, turn ignition on and shift out of Park. \(4.\) Shift back into part and complete shutdown of ignition cycle

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10219923-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10219923-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

C1472

## Vehicles listed

- 2021 JEEP GRAND CHEROKEE

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [113528](/bulletins/11035187.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [113529](/bulletins/11035186.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [18\-050\-26](/bulletins/11031455.md), 2026-04-22, Service bulletin: POWER TRAIN; ENGINE. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0300 \- Multiple Cylinder Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0301 \- Cylinder 1 Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0302 \- Cylinder 2 Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0303 \- Cylinder 3 Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0304 \- Cylinder 4 Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0305 \- Cylinder 5 Misfire \- In Active or Stored status set during cold start catalyst heating. ● P0306 \- Cylinder 6 Misfire \- In Active or Stored status set during cold start catalyst heating. Customers may also comment on one or more of the following: ● Check engine illuminates when fueling the vehicle while the engine is running. ● Vehicle has a noticeable misfire. ● Vehicle idles rough. ● Engine noise. NOTE: Noise is heard coming from the valvetrain. In addition, the following software enhancement is available: ● Update to prevent customers from driving their vehicles while the Electric Park Brake \(EPB\) is engaged. Engine torque will be limited to prevent the Rear Drive Unit from being damaged. NOTE: Previously, the EPB would remain engaged without any torque limit which could lead to the Rear Drive Unit being damaged/broken. This bulletin involves reprogramming the PCM with the latest available software.
- [S2623000023](/bulletins/11031337.md), 2026-04-15, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. Power Liftgate Inoperative.
- [S2621000003 REV.A](/bulletins/11030138.md), 2026-03-18, Service bulletin: POWER TRAIN. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV, 8HP75\-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [S2621000003](/bulletins/11029770.md), 2026-03-05, Service bulletin: POWER TRAIN. Service transmission/check engine warning indicator for the 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV transmissions that have fault codes P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [S2521000004 REV.B](/bulletins/11027739.md), 2026-01-21, Service bulletin: STEERING; SUSPENSION; POWER TRAIN. The customer is experiencing a clicking or pop noise from the steering knuckle and bearing area during turns while driving.
- [109161](/bulletins/11026820.md), 2025-12-23, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. SWITCH \- TRANSFER CASE, RIDE HEIGHT, TERRAIN SELECT
- [S2521000005](/bulletins/11026809.md), 2025-12-23, Service bulletin: SERVICE BRAKES; POWER TRAIN. The customer states the ABS and Traction Control warning comes on. Vehicle sets wheel speed BSCM/ABS fault codes.

JSON: [/v1/bulletins/10219923](/v1/bulletins/10219923)

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