# Service bulletin TSB 21\-2335

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: 10201906
- Published by NHTSA: 2021\-10\-05
- Manufacturer's number: TSB 21\-2335
- Manufacturer's date: 2021\-09\-28
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; UNKNOWN OR OTHER

## NHTSA's summary

Some 2020\-2021 Transit vehicles may experience a pop/sizzle/crack noise from the exhaust. This may be due to water dripping on the exhaust from the evaporator drain tube. To correct the condition, follow the Service Procedure to extend the the length of the evaporator drain tube.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10201906-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10201906-9999.pdf)

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

## Components

Engine, Exhaust and emissions

## Vehicles listed

- 2020 to 2021 FORD TRANSIT

## Other bulletins for the same vehicles and component

- [SSM 54363](/bulletins/11025526.md), 2025-11-13, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN; ENGINE. Some 2021\-2025 Expedition/Navigator/F\-150/F\-Super Duty/F\-53 Motorhome/F59 Commercial Stripped Chassis/F\-650/F\-750/Transit vehicles equipped with a 2.7L/3.5L \(non hybrid\)/6.8L/7.3L engine and 2021\-2026 E\-Series may exhibit a rattle/scraping noise from the bellhousing area on start\-up. Workshop Manual \(WSM\), Section 303\-00 Engine System \- General Information \> Diagnosis and Testing and 303\-06 \> Starting System has been updated to address this condition. Additionally, WSM, Section 303\-01 \> Removal and Installation \> Engine to Transmission Spacer Plate has been added to address this condition. Refer to the revised WSM sections for normal diagnosis.
- [SSM 54269](/bulletins/11024021.md), 2025-10-08, Service bulletin: ENGINE. Some 2021\-2025 Expedition/Navigator/F\-150/F\-Super Duty/F\-53 Motorhome/F59 Commercial Stripped Chassis/F\-650/F\-750/Transit vehicles equipped with a 2.7L,3.5L EcoBoost \(non\-hybrid\), 3.5L Cyclone, 6.8L or 7.3L engine, may exhibit a rattle/scraping noise from the bellhousing area on start\-up. Workshop Manual \(WSM\), Section 303\-00 Engine System \- General Information \> Diagnosis and Testing and 303\-06 \> Starting System has been updated. Additionally, WSM, Section 303\-01 \> Removal and Installation \> Engine to Transmission Spacer Plate has been added to address this condition. Refer to the revised WSM sections for normal diagnosis.
- [TSB 25\-2363](/bulletins/11021708.md), 2025-08-07, Service bulletin: ENGINE. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: \* Lack of air flow from inoperative blower motor \* Open or damaged fuse F10 in the BJB This may be due to a damaged fuse F10 \(40A\) in the battery junction box \(BJB\). \*\* Model secton: all gas engine \(non\-BEV\) \*\*\*\*\* Legacy verbiage \- will be removed after completing approvals \*\*\*\*\* Some 2020\-2024 Transit all gas engine \(non\-BEV\) vehicles may exhibit a lack of air flow due to an inoperative heating, ventilation, and air conditioning \(HVAC\) blower motor. This may be due to a damaged fuse F10 \(40A\) in the battery junction box \(BJB\). To correct the condition, replace the fuse F10 \(position 7 in the BJB\). Replace the BJB and BJB harness only if it is required with the listed service replacement part.
- [SSM 53764](/bulletins/11018521.md), 2025-05-21, Service bulletin: POWER TRAIN; ENGINE. Some 2020 Continental, 2020\-2024 Edge/Nautilus, 2020\-2025 Explorer/Aviator/Escape/Corsair/F\-150/F\-Super Duty/Ranger/Transit/E\-Series, 2021\-2025 Bronco, and 2022\-2025 Maverick vehicles may require an engine cooling system flush to be performed for various concerns. Workshop Manual \(WSM\), Section 303\-03 has been updated to eliminate the need to remove and install the radiator assembly to perform a radiator flush.
- [SSM 52335](/bulletins/10251952.md), 2024-03-20, Service bulletin: ENGINE AND ENGINE COOLING. For 2015\-2024 Ford and Lincoln vehicles equipped with turbocharged engines and customer concern of an engine oil leak, refer to Workshop Manual \(WSM\), Section 303\-00 for oil leak inspection and testing methods. Ford has evaluated turbochargers replaced for oil leak symptoms and although oil may collect on the external surface of a turbocharger, it is extremely rare for a turbocharger assembly to be the root cause of the oil leak. Careful inspection of the turbocharger oil feed and drain tubes should be performed along with the recommended WSM procedures as needed. Warranty claims for turbocharger replacement going forward will be assessed.
- [TSB 23\-2015](/bulletins/10230775.md), 2023-01-31, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ENGINE AND ENGINE COOLING. 2021\-2022 F\-150 vehicles with 2.7L, 3.3L, 3.5L EcoBoost or 5.0L engines, 2020\-2022 Transit vehicles with 3.5L Duratec/3.5L EcoBoost engines, 2023 Bronco with the 2.3L engine having charging system diagnostics performed in the Workshop Manual \(WSM\) may experience the generator voltage desired \(GENVDSD\) parameter identification \(PID\) missing from the powertrain control module \(PCM\) PID list in the Ford Diagnosis And Repair System \(FDRS\) scan tool. This may be due to a software parameter in the PCM. To correct the condition, follow the Service Procedure to reprogram the PCM.
- [SSM 50988](/bulletins/10217832.md), 2022-08-15, Service bulletin: ENGINE AND ENGINE COOLING. Some 2018\-2021 F\-150 3.3L, 2020\-2021 Explorer 3.3L, and 2020\-2021 Transit 3.5L may experience an illuminated low oil pressure and malfunction indicator lamp \(MIL\) with diagnostic trouble code \(DTC\) P0521 stored in the powertrain control module \(PCM\) after a short block or long block replacement. This may be due to a design change of the engine oil pressure \(EOP\) sensor, which is not backwards compatible. To correct the condition, transfer the sensor from the original engine or replace the EOP sensor with GN1Z\-9D290\-D.
- [21L04](/bulletins/10213730.md), 2022-06-10, Service bulletin: ENGINE; EQUIPMENT:OTHER:LABELS; FUEL SYSTEM, GASOLINE. Certain 2020\-2021 Model Year Transit Vehicles Equipped with a 3.5L Ecoboost Engine \- Fuel Filler Door E85 Label Removal .In all of the affected vehicles, the fuel tank filler door may incorrectly have an E85 fuel label installed on units that are not rated for E85 fuel. The use of E85 fuel in vehicles not rated for E85 fuel may cause a lean condition along with a Malfunction Indicator Lamp \(MIL\) and a P0172 Diagnostic Trouble Code \(DTC\). Continued driving with E85 fuel may lead to drivability symptoms including hard to start, rough idle, stalling, hesitation, surging, or lack of power.
- [21L04](/bulletins/10211953.md), 2022-05-19, Service bulletin: ENGINE. Certain 2020\-2021 Model Year Transit Vehicles Equipped with a 3.5L Ecoboost Engine \- Fuel Filler Door E85 Label Removal \- In all of the affected vehicles, the fuel tank filler door may incorrectly have an E85 fuel label installed on units that are not rated for E85 fuel. The use of E85 fuel in vehicles not rated for E85 fuel may cause a lean condition along with a Malfunction Indicator Lamp \(MIL\) and a P0172 Diagnostic Trouble Code \(DTC\). Continued driving with E85 fuel may lead to drivability symptoms including hard to start, rough idle, stalling, hesitation, surging, or lack of power.
- [SSM 50306](/bulletins/10204040.md), 2021-12-07, Service bulletin: ENGINE AND ENGINE COOLING. Some 2018\-2021 EcoSport, Expedition, Navigator; 2019\-2021 Ranger; 2020\-2021 Escape, Corsair, Explorer, Transit; 2021 Bronco, Bronco Sport, Edge, Nautilus, F\-150, Mustang; 2019\-2022 Transit Connect; 2020\-2022 Aviator, F\-Super Duty; and 2022 Maverick vehicles may exhibit an illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTC\) P0496, P0456, P0455, P04F0, and/or P0451. Ford has tested returned EVAP canister purge valves and found them to be fully functional. Prior to replacing the canister purge valve or other EVAP components, perform the following tests using the Ford Diagnosis and Repair System \(FDRS\) Scan Tool: Full System EVAP Leak Test \- FDRS Location: TOOLBOX \> PCM \> PCM \- Evap Emissions System Test and the EVAP Purge Valve Leak Test \- FDRS Location: TOOLBOX \> PCM \> Evap Emission System Toolbox \> CPV Check.

JSON: [/v1/bulletins/10201906](/v1/bulletins/10201906)

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