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Campaign 21V399 Posted May 27, 2021 276 units

2018-2021 Temsa TS35/TS45 Recall 21V399: Fuel Rail Leak

RN
Reviewed by the RecallNotify editorial team
Published May 23, 2026

Recall 21V399 covers 276 2018-2021 Temsa TS35E, TS35C, and TS45 buses for a fuel rail leak. Repair is free at any franchised Temsa dealer.

Temsa is recalling 276 2018-2021 TS35E, TS35C, and TS45 vehicles because sealing washers in the pilot bore holes can fail to seat correctly, which allows the high pressure fuel rail assembly to leak. Fuel leaking near an ignition source increases the risk of a fire, and Temsa dealers will complete the repair free of charge.

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What's wrong?

The high-pressure fuel rail on the 2018-2021 Temsa TS35E, TS35C, and TS45 carries diesel fuel under pressure from the Cummins engine fuel system to the injectors. The injectors use that pressure to deliver fuel into the engine. A sealing washer at the rail end is supposed to sit squarely in its bore and keep the joint sealed.

On affected vehicles, the pilot bore for that sealing washer is undersized. The washer does not seat correctly, so the joint does not get the clamping load it needs to stay sealed in service. As the engine runs, diesel fuel can leak from the high-pressure fuel rail assembly.

An operator can see diesel fuel or smell diesel fuel around the vehicle. The check engine lamp can also illuminate. Those are the warning signs to report when contacting a Temsa dealer.

Who's affected?

Covers three Temsa bus models across the 2018, 2019, 2020, and 2021 model years, all tied to the fuel rail in Cummins diesel engines.

2019 Temsa TS35E fuel system
2021 Temsa TS35E fuel system
2020 Temsa TS35C fuel system
2021 Temsa TS35C fuel system
2019 Temsa TS35C fuel system
Units affected276
Field incidentsNHTSA has logged no field incidents to date.

The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific bus is included.

What's the safety risk?

A fuel leak near an ignition source increases the risk of a fire. If you smell or see diesel fuel, or the check engine lamp comes on, park safely and call a Temsa dealer before continuing service. Repair is free at any franchised Temsa dealer.

What should I do?

  1. Check your VIN to confirm your 2018-2021 Temsa TS35E, TS35C, or TS45 is included in this recall.
  2. Contact a franchised Temsa dealer to schedule the free fuel-rail inspection and any needed rail replacement.
  3. Tell the dealer the high-pressure fuel rail can leak because the sealing washer does not seat correctly, and reference recall number 21V399 when you call.
  4. Bring the owner notice if you have it; the dealer repair is free.
  5. Keep the vehicle away from open flames or other ignition sources if you notice a fuel leak before the repair.

What happens at the repair

At the dealer, a Temsa technician inspects the rail threads and fuel lines, then replaces the high pressure fuel rail if the inspection shows the rail needs replacement. The inspection, replacement rail, and labor are free under the recall. Temsa has a general reimbursement plan on file for owners who already paid for a related repair before the recall notice. Bring repair paperwork and payment documentation to the service desk, or contact Temsa customer service at 1-800-625-9319 for the reimbursement process.

ReimbursementReimbursement available

Timeline

May 27, 2021 NHTSA published the recall
June 10, 2021 VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle.
June 10, 2021 Interim owner notification (was planned for this date)
July 30, 2021 Owner notification mailed

Frequently asked questions

What is recall 21V399?

Recall 21V399 covers 276 2018-2021 Temsa TS35E, TS35C, and TS45 buses with a sealing washer problem in the high pressure fuel rail assembly. Fuel can leak from the rail area, and Cummins will inspect the rail threads and fuel lines, then replace the rail if needed for free.

What should I do if my 2018-2021 Temsa TS35E, TS35C, or TS45 is on this recall?

Check your VIN to confirm your specific bus is included in recall 21V399. If it is, contact a franchised Temsa dealer or Temsa customer service at 1-800-625-9319 to schedule the Cummins fuel rail inspection and repair. Reference recall number 21V399 when you call.

Is the recall repair free?

Yes. Federal recall law requires the defect repair at no cost to the owner. For recall 21V399, Cummins will inspect the rail threads and fuel lines, then replace the fuel rail if needed, free of charge.

What is the safety risk in recall 21V399?

The safety risk is fire. The sealing washer can fail to seat correctly in the pilot bore holes, which can let the high pressure fuel rail assembly leak fuel. A fuel leak near an ignition source increases the risk of a fire.

When were owners notified about recall 21V399?

Temsa mailed owner notification letters on July 30, 2021. If you bought the bus used or never received a letter, the VIN still decides whether the recall applies. Check your VIN, then call Temsa customer service or a franchised Temsa dealer if it is included.

More information

NHTSA campaign pagenhtsa.gov/vehicle-recalls/21V399000
Temsa customer service1-800-625-9319
NHTSA recall #21V399
NHTSA recall # (full)21V399000

Source documents

This article is generated from NHTSA's primary recall filings and reviewed against the source on May 23, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →