All manufacturers of motor vehicles or motor vehicle equipment, including low volume and child restraints, must submit to NHTSA copies of their manufacturer communications sent to dealers, distributors, owners, purchasers, lessors, or lessees regarding any defect, failure or malfunction beyond normal deterioration in use, failure of performance, flaw or other unintended deviation from design specifications whether it is safety-related or not.
NHTSA ID Number: 11034411
TSB Date: 2026-07-02
Manufacturer Communication Number: LI47_00-N-069565
Summary
Fuel Level Unchanged After Refueling Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause A. The Fuel Supply Control Unit (FSCU) fails to detect a refueling event B. The Fuel Level Sensor provides incorrect readings due to mechanical interference or installation issues
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Read More...NHTSA ID Number: 11034410
TSB Date: 2026-07-02
Manufacturer Communication Number: LI14.20-N-073867
Summary
Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes PDF document in attachments. Complaint C: One or more electrical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of electrical fault codes PDF document attached. NOTE: This LI supersedes LI14.20-N-073813, which is no longer valid. Cause Cause of Complaint A: Increased friction between the EGR Valve blade and seat
due to soot deposits causing a delay of the EGR Valve being able to reach the target value of the EGR Valve position controller. NOTE: This causes the EGR Valve blade and potentially the boost pressure controller to oscillate. Cause of Complaint B: Soot deposits between the EGR Valve blade and seat leading to the EGR Valve no longer being able to meet the de-sired target of the EGR Valve position controller. Cause of Complaint C: Internal EGR Valve or other electrical faults related to the EGR Valve function. Remedy Remedy for Complaint A: Perform the following steps: 1. Disable the EGR Valve (Y27/17) by disconnecting the electrical connector. 2. Perform a test drive to check if the jolting/bucking issue resolves. 3. If the jolting/bucking is resolved, proceed to Remedy for Complaint B. 4. If jolting/bucking is still present, proceed with diagnosis to determine the root cause. Consider checking the follo-wing, but not limited to: •EGR system including the EGR Cooler, EGR Bypass Flap, EGR Temperature Sensor, and pipes for proper operati-on, excessive sooting and/or clogging, as well as EGR Bypass Flap vacuum element, switchover valve, and vacuum system. •Visually check the leak oil line or T-piece; reference LI07.00-N-059118.
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Read More...NHTSA ID Number: 11034409
TSB Date: 2026-07-02
Manufacturer Communication Number: LI09.40-N-079144
Summary
Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: • P300A6D The boost pressure is too low. Charge Air Cooler. • P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low. • P300DFB Component 'Boost pressure positioner' has a malfunction. • P300DE8 Boost pressure control A has a malfunction after the cold start. Cause The potential causes for these fault codes are: A. Leak or Blockage in the Intake or Charge Air System: This can prevent the proper flow of air, affecting the boost pressure. B. Insufficient Source Vacuum, Vacuum Leak, or Sticking/Weak Vacuum Component: These issues can prevent the boost pressure positioner from functioning correctly. • For Model Year 2023-Cuurent vehicles operating at approximately 4,000 ft elevation or above, reduced ambient pressure and/or high brake demand may contribute to reduced available vacuum differential and under boost com-plaints, even when no discrete vacuum component failure is identified. C. Internal Malfunction of the Boost Pressure Positioner: The component itself may be faulty. D. Internal Defect with the Variable Turbine Geometry (VTG) System inside the Turbocharger: Issues within the turbo-charger can affect boost pressure control. Remedy A. Leak or Blockage in the Intake or Charge Air System 1. Perform a Pressurized Smoke Test: •Conduct a smoke test on the intake, the charge air system, and the exhaust to identify any leaks.
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Read More...NHTSA ID Number: 11034408
TSB Date: 2026-07-02
Manufacturer Communication Number: LI09_40-N-079144
Summary
Complaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: • P300A6D The boost pressure is too low. Charge Air Cooler. • P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low. • P300DFB Component 'Boost pressure positioner' has a malfunction. • P300DE8 Boost pressure control A has a malfunction after the cold start. Cause The potential causes for these fault codes are: A. Leak or Blockage in the Intake or Charge Air System: This can prevent the proper flow of air, affecting the boost pressure. B. Insufficient Source Vacuum, Vacuum Leak, or Sticking/Weak Vacuum Component: These issues can prevent the boost pressure positioner from functioning correctly. • For Model Year 2023-Cuurent vehicles operating at approximately 4,000 ft elevation or above, reduced ambient pressure and/or high brake demand may contribute to reduced available vacuum differential and under boost com-plaints, even when no discrete vacuum component failure is identified. C. Internal Malfunction of the Boost Pressure Positioner: The component itself may be faulty. D. Internal Defect with the Variable Turbine Geometry (VTG) System inside the Turbocharger: Issues within the turbo-charger can affect boost pressure control. Remedy Engineering Review Required: For vehicles operating at approximately 4,000 ft elevation or above, a TIPS case MUST be opened before replacing any component for fault codes P300A6D, P300974, P300DFB, or P300DE8.
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Read More...NHTSA ID Number: 11034407
TSB Date: 2026-07-02
Manufacturer Communication Number: LI07.16-N-080732
Summary
Complaint The customer reports that the engine cranks but does not start, or only starts after extended cranking. A check engine light may be present, and fault codes P300616 (The fuel pressure in the system is too low) and/or P300617 (The fuel pressure in the system is too low) may be stored, along with other fuel pressure-related fault codes. Cause Insufficient high-pressure fuel build-up during engine cranking. The fuel system does not achieve the required rail pressure of >120 bar, preventing engine start. This condition may be caused by internal leakage within the fuel injection system, inadequate fuel supply from the low-pressure circuit, or a malfunction of the high-pressure fuel pump. Remedy 1. Verify high-pressure fuel rail pressure during engine cranking using XENTRY actual values. • Evaluate the actual value “The starter turns and the combustion engine does not start” and monitor high-pressure fu-el rail pressure during cranking. (See attachment: XENTRY actual values – rail pressure not reaching >120 bar) • The system must achieve a minimum of >120 bar in order to enable engine start. → If the specified rail pressure is not achieved, perform the following checks: 2. Check low-pressure fuel supply • Verify fuel quality (color, clarity, separation, contamination) • Inspect fuel tank, fuel filter, and low-pressure fuel pump for debris, restriction, or damage • Measure low-pressure fuel supply before and after the fuel filter and confirm values are within specification • Perform a fuel volume test at the high-pressure pump inlet to ensure adequate delivery • Verify that the injector leak line is installed correctly, remains unmodified, and is not restricted or kinked → If low-pressure fuel supply is not within specification: Repair as necessary and recheck high-pressure fuel build-up 3. Check for internal leakage within the fuel injection system • Perform a fuel injector leak/return test using XENTRY • Evaluate injector leak-back during cranking NOTE: If the combustion engine does not start, perform the test by cranking the engine 3–4 times for approximately 15 seconds each, instead of allowing the engine to run for approximately 60 seconds → If injector leakage is present: Replace the affected injector(s) and perform injector teach-in 4. Check high-pressure fuel system • If no leakage is identified and low-pressure supply is sufficient, evaluate high-pressure fuel generation → If high-pressure fuel system does not generate sufficient pressure: Replace the high-pressure fuel pump 5. Final verification • Verify that rail pressure exceeds >120 bar during cranking • Confirm the engine starts normally without extended crank • Clear fault codes and perform final validation
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Read More...NHTSA ID Number: 11034406
TSB Date: 2026-07-02
Manufacturer Communication Number: LI07.16-N-080731
Summary
Complaint The customer reports an exhaust odor from the engine compartment, potentially accompanied by a check engine light and/or engine misfire. Cause The injector hold-down may fracture due to material-related factors, allowing the injector to lift from its seat and resulting in combustion gas leakage past the sealing interface. Remedy Carry out repair measures in accordance with the extent of damage determined during inspection. Replace only tho-se components identified as faulty or compromised by the failure, including the fuel injector, sealing ring, injector hold-down, hold-down bolt, high-pressure fuel line(s), and, if required, the fuel distributor (rail). All work involving fuel injector removal and installation must be carried out in accordance with WIS document AR07.16-D-1020TSM. Particular attention must be given to the proper preparation of the injector bore and sealing in-terface. All carbon deposits, combustion residue, and surface contamination must be fully removed to ensure correct injector seating and sealing integrity, thereby preventing combustion gas blow-by and repeat failure.
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Read More...NHTSA ID Number: 11034404
TSB Date: 2026-07-02
Manufacturer Communication Number: 2026050008
Summary
On certain Mercedes-Benz eSprinter vehicles, the software for the DC Box control unit does not correspond to the current series production configuration.
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Read More...NHTSA ID Number: 11034401
TSB Date: 2026-07-02
Manufacturer Communication Number: LI32.34-P-080645
Summary
Complaint Rattle or clunking noise from underneath the vehicle when driving over uneven/bumpy surfaces. Cause Internal tolerances of the electric rollbar. Remedy 1. Confirm front or rear roll bar. 2. Remove the affected sway bar links and carefully drive vehicle. • Noise not resolved with sway bar links removed > Not appliable to this LI, noise is from a different component. • Noise resolved with sway bar links removed > Current parts may make some noise and is currently state of the art. Optimized, quieter parts will be available Q4 2026, please release vehicle until such time parts are available. For further questions, inquiries, or sound levels approximately equal to or above what is shown in the attachment, open a TIPS case to the Body, Chassis, Entertainment inbox.
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Read More...NHTSA ID Number: 11034400
TSB Date: 2026-07-02
Manufacturer Communication Number: 26901
Summary
Certain 2025 thru 2027 IC Bus™ CE Series school buses and IC Bus™ Electric CE Series school buses entrance doors may fall out of adjustment over time and with use. A door that is not adjusted properly may result in an improperly closed door and trigger an open door warning light on the dashboard.
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Read More...NHTSA ID Number: 11034398
TSB Date: 2026-07-02
Manufacturer Communication Number: IK4300031
Summary
This document will provide information regarding certain approved S13 and T14 chemicals.
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Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
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Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
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