# Service bulletin 20U12

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: 10175999
- Published by NHTSA: 2020\-06\-05
- Manufacturer's number: 20U12
- Manufacturer's date: 2020\-05\-18
- NHTSA component: ENGINE AND ENGINE COOLING:ENGINE:DIESEL

## NHTSA's summary

Some of the affected vehicles may have a valve seat that is below the required retention force or not fully seated into one of the cylinder heads. A valve seat that is out of position may cause the illumination of the check engine light and may lead eventually to engine damage and potentially resulting in engine failure.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10175999-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10175999-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2020 FORD F\-250 SD
- 2020 FORD F\-350 SD
- 2020 FORD F\-450 SD
- 2020 FORD F\-550 SD

## Other bulletins for the same vehicles and component

- [25M01](/bulletins/11035635.md), 2026-08-04, Other: ENGINE; UNKNOWN OR OTHER. Customer Satisfaction Program 25M01 Certain 2021 Model Year F\-150 3.0L Diesel Engine and 2020\-2022 Model Year Super Duty with 6.7L Diesel Engine Nitrogen Oxide \(NOx\) Sensor Replacement, If Required After Dealer Evaluation Reference: Emissions Recalls 22E02, 22E04, 23E01, and 25E09
- [TSB 26\-2256](/bulletins/11034010.md), 2026-06-22, Service bulletin: ENGINE; UNKNOWN OR OTHER. This article supersedes TSB 25\-2572 to update the Parts List to correct the part number LC3Z\-6006\-L to LC3Z\-6781\-A, remove the flex plate bolts AL3Z\-6379\-BA from the parts list as these bolts are in kit LC3Z\-6781\-A, update the claim quantity of the part number W709771\-S440 to 9 pieces \(F\-650/F750\-Engine Replacement\), W706447\-S437 and W715068\-S437 to 4 pieces, W712861\-S439 to 8 pieces\(F\-Super Duty Pickup And Chassis Cab\-Engine Replacement\) / 8 pieces \(F\-53 Motorhome/F\-59 Stripped Chassis Cab/F\-650,F750 Engine Replacement\) / W714286\-S442 to 4 pieces \(F\-Super Duty Pickup And Chassis Cab\-Camshaft and Tappet Repair / F\-Super Duty Pickup And Chassis Cab\-Engine Replacement\), include LC3Z\-6020\-A for the Engine replacement lists, include 1 fuel injector seal kit to the Camshaft and Tappet repair lists, include 4 pieces of W520114\-S440 to the E Series\-Camshaft and Tappet Repair list, and update the engine oil part numbers XO\-5W30\-Q1SP and CXO\-5W30\-LSP6. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing ro
- [TSB 25\-2572](/bulletins/11025854.md), 2025-12-01, Service bulletin: POWER TRAIN; ENGINE. This article supersedes TSB 25\-2322 to update the Service Procedure, Labor Operations and Parts List. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction indicator lamp \(MIL\) with diagnostic trouble code \(DTC\) P0301\-P0308 in the powertrain control module \(PCM\). This may be due to camshaft and/or valve tappet having excess wear within the engine assembly.
- [24L05](/bulletins/11023852.md), 2025-10-03, Other: ENGINE; UNKNOWN OR OTHER. Certain 2011\-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine \- Emission Control Information Label Update for Qualified Vehicles
- [24L04](/bulletins/11023851.md), 2025-10-03, Other: UNKNOWN OR OTHER; ENGINE. Certain 2017 and 2020\-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine \- Emission Control Information Label Update
- [24L03](/bulletins/11022380.md), 2025-09-03, Other: ENGINE; UNKNOWN OR OTHER. Certain 2020\-2023 Model Year Multiple Vehicle Line Trucks Equipped with Diesel Engines \- Particulate Matter \(PM\) Sensor Reimbursement
- [24L04](/bulletins/11022379.md), 2025-09-03, Other: UNKNOWN OR OTHER; ENGINE. Certain 2017 and 2020\-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine \- Emission Control Information Label Update
- [24L05](/bulletins/11022355.md), 2025-09-03, Other: ENGINE; UNKNOWN OR OTHER. Certain 2011\-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine \- Emission Control Information Label Update for Qualified Vehicles
- [TSB 25\-2200](/bulletins/11018524.md), 2025-05-21, Service bulletin: ENGINE; POWER TRAIN. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction indicator lamp \(MIL\) with diagnostic trouble code \(DTC\) P0301\-P0308 in the powertrain control module \(PCM\). This may be due to camshaft and/or valve tappet having excess wear within the engine assembly.
- [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.

JSON: [/v1/bulletins/10175999](/v1/bulletins/10175999)

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