# Service bulletin TSB 21\-2354

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: 10202711
- Published by NHTSA: 2021\-11\-02
- Manufacturer's number: TSB 21\-2354
- Manufacturer's date: 2021\-10\-14
- NHTSA component: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## NHTSA's summary

Some 2021 Bronco vehicles built on or before 23\-Aug\-2021 may experience a charging system fault message displayed in the instrument panel cluster \(IPC\) and diagnostic trouble codes \(DTC\) U012D, U0284 and/or U0285 stored in the powertrain control module \(PCM\). This may be due to water intrusion in the active grille shutter connector. To correct this condition, follow the Service Procedure to inspect for water intrusion in the active grille shutter harness connector and repair as needed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202711-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202711-9999.pdf)

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

## Components

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

## Trouble codes named

U012D, U0284, U0285

## Vehicles listed

- 2021 FORD BRONCO

## Recalls for the same vehicles and component

- [26V236000](/recalls/nhtsa/26V236000.md), 2026-04-14: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [SSM 52342](/bulletins/10251954.md), 2024-03-20, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Some 2022\-2024 Broncos Raptors built on and before 13\-Feb\-2024 and 2021\-2024 Broncos equipped with a 2.3L EcoBoost engine may exhibit an illuminated MIL with ignition system DTC\(s\) P0352, P0353, P0354, P0355, P0357, P2303, P2306, P2309, P2312, P2318, P2304, P2307, P2310, P2313, P2319, and/or P2322 set in the powertrain control module \(PCM\). This may be due to incorrect cylinder to DTC mapping within the PCM. This means the DTCs listed may set against the incorrect cylinder. Even though the cylinder to DTC mapping is incorrect in the PCM, the presence of these DTCs means that a real ignition system concern is present that requires diagnosis and repair. Prior to performing a pinpoint test for one of the listed DTCs, it will be necessary to identify the correct cylinder that has the issue. Do this by using the Ford diagnosis and repair system \(FDRS\) to perform a cylinder power balance test. If the results show two cylinders dropping out, begin diagnosing the ignition system components for the cylinder that is dropping out and not setting an ignition related DTC. Due to the incorrect cylinder to DTC mapping
- [SSM 52197](/bulletins/10249422.md), 2024-01-30, Service bulletin: UNKNOWN OR OTHER; WHEELS; POWER TRAIN:AUTOMATIC TRANSMISSION. Some 2021\-2024 Bronco vehicles equipped with 4x4 with part time engagement and built on or before 12\-Jan\-2024 may exhibit a condition of the vehicle being stuck in neutral tow mode. This may be due to a concern with the all\-wheel drive \(AWD\) module software. Make sure the proper procedure is being followed to exit neutral tow mode by referring to the Owner's Manual \> Towing Your Vehicle \> Recreationally Towing Your Vehicle. Make sure the vehicle's battery is fully charged and then diagnose all diagnostic trouble codes \(DTCs\) in the AWD module. Refer to Workshop Manual \(WSM\), Section 307\-07A. If diagnostics do not resolve the concern or there are no DTCs present in the AWD module, reprogram the AWD module using the latest software level of the Ford Diagnosis and Repair System \(FDRS\) diagnostic scan tool. Refer to the appropriate section of the WSM. Once the repair is complete, verify the vehicle's ability to successfully enter and exit neutral tow mode by cycling the vehicle in and out of neutral tow mode a minimum of two times, allowing the vehicle to enter sleep mode \(key\-off for at least 5 minutes\) be
- [TSB 23\-2400](/bulletins/10248359.md), 2024-01-05, Service bulletin: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This article supersedes TSB 23\-2086 to update the parts list. Some 2021\-2023 Bronco vehicles may encounter a Sta\-bar Disconnect Service Required message in the instrument panel cluster and an illuminated warning light with any of the following diagnostic trouble codes \(DTCs\) stored in the chassis control module \(CHCM\): C103A, C1A99, C1B03, C1B07, C1B14 and/or B1A67. To correct the condition, follow the Service Procedure to address water intrusion and reprogram the CHCM.
- [SSM 51961](/bulletins/10244824.md), 2023-11-03, Service bulletin: ENGINE AND ENGINE COOLING:COOLING SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Some 2021\-2023 Bronco vehicles may exhibit an illuminated MIL with DTCs P0096 and/or P007B in the powertrain control module \(PCM\), which may be more prevalent in high ambient air temperatures. For vehicles that meet this criateria, inspect the front of the vehicle for the presence of an aftermarket bumper and/or accessories which may restrict air flow to the charge air cooler and surrounding sensors. Remove the aftermarket accessory and return the vehicle to stock and reevaluate. If the concern returns with the stock bumper/accessories removed, proceed to normal Workshop Manual diagnostics.
- [SSM 51677](/bulletins/10237589.md), 2023-06-08, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM:SOFTWARE. Some 2021\-2023 Bronco vehicles may exhibit an inaccurate AAT reading with DTC P0072 stored in the powertrain control module \(PCM\). The Workshop Manual \(WSM\), Section 413\-01 \> pinpoint test \(PPT\) BC has been updated to address this concern. The AAT WSM updates include: improved diagnosis and testing, AAT sensor reset, and the AAT sensor interaction with climate control system and gateway module A \(GWM\).
- [TSB 22\-2392](/bulletins/10233576.md), 2023-04-04, Service bulletin: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Some 2021\-2022 Bronco vehicles may exhibit a charging system fault message displayed in the instrument panel cluster \(IPC\) after water fording in muddy water. This may be the result of mud accumulation inside the generator causing it to fail. To resolve the concern, follow the Service Procedure to replace the generator and install a revised generator shield onto the vehicle.
- [TSB 23\-2006](/bulletins/10230772.md), 2023-01-31, Service bulletin: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Some 2021\-2022 Bronco may encounter a sta\-bar disconnect service required message in the instrument panel cluster and a warning light illuminated with any of the following diagnostic trouble codes \(DTCs\) stored in the chassis control module \(CHCM\): C103A, C1A99, C1B03, C1B07, C1B14 and/or B1A67. To correct the condition, follow the Service Procedure to address water intrusion and reprogram the CHCM.
- [TSB 21\-2366](/bulletins/10202712.md), 2021-11-02, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE. Some 2021 Bronco vehicles equipped with a 2.7L EcoBoost engine and built on or before 01\-Sep\-2021 may exhibit an illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTC\) P2096 and/or P2098 stored in the powertrain control module \(PCM\). This may be due to various software parameters within the PCM and/or a catalyst monitor sensor. To correct the condition, follow the Service Procedure to reprogram the PCM.
- [SSM 50210](/bulletins/10202643.md), 2021-10-29, Service bulletin: POWER TRAIN:DRIVELINE:DRIVESHAFT; ENGINE; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Some 2021 Bronco vehicles built on or before 14\-Sep\-2021 may experience a loss of power when driving with various illuminated warning indicators displayed in the instrument panel cluster \(IPC\). This may be due to an improper seating of the wiring harness push pins to the driveshaft loop which can cause an interference condition between the rear driveshaft and the 14405 harness near the C2370/C350 connector. If suspected, inspect the harness and connector for damage and repair as necessary. Once inspected and/or repaired fully, seat the harness push pins to the driveshaft loop.
- [SSM 50184](/bulletins/10202622.md), 2021-10-29, Service bulletin: POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS:ACTUATORS/SOLENOIDS. Some 2021 Bronco/F\-150/Explorer/Aviator/Police Interceptor Utility vehicles, excluding hybrid, may exhibit harsh or delayed engagement/shift concerns. Most concerns may be addressed with the PCM/TCM Transmission Accelerated Main Control Break In Routine. Refer to Workshop Manual \(WSM\), Section 307\-01, DTC Chart and/or Diagnosis By Symptom to identify the clutch\(s\) to be cycled. This routine cycles the shift solenoids and clutch control valves to remove contamination that may be sticking the valves and must be performed along with an adaptive drive cycle before attempting internal service. Although this routine was developed for low mileage vehicles, its usage is being expanded for various symptoms across the life of the vehicle.For claiming, use causal part 7A100 and applicable labor operations in Section 7 of the Service Labor Time Standards \(SLTS\) Manual.

JSON: [/v1/bulletins/10202711](/v1/bulletins/10202711)

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