The Recall Desk
Our severity:HighNHTSA·25E083000·Announced 2025-12-05

Nova Bus engine cooling system pump recall due to potential impeller shaft failure

Nova Bus is recalling certain water pumps because a loose impeller shaft may cause pump failure, increasing crash risk.

What this means for you

Our assessment, not the agency’s: severity 3/5 (High).

Real risk of harm even if no illness or injury has been reported yet. Stop using the product and follow the agency's guidance.

Our severity reasoning: The recall involves a mechanical defect (loose impeller shaft) that could cause pump failure and increase crash risk, but no injuries or fatalities have been reported. Per the rubric, such risk-of-harm products with unconfirmed injuries warrant a High severity score (3).

Plain-English summary

Nova Bus (US) Inc. is recalling certain Ametek MCP and ECP water pumps used in engine cooling systems. The recall is due to a potential defect where the impeller shaft may become loose, causing the pump to fail. A failed pump can result in loss of drive power, which increases the risk of a crash. Affected owners should have their pumps inspected and replaced free of charge. Nova Bus sent owner notification letters on January 30, 2026, and customers can contact their customer service at 1-450-472-6410 for assistance. The manufacturer's recall number is ER25510.

This recall was issued by the National Highway Traffic Safety Administration (NHTSA) under recall number 25E083000. The defective components are part of the engine and cooling system, specifically the water pump assembly. While the recall addresses a mechanical failure that could compromise drivability and safety, no injuries or fatalities have been reported associated with this specific defect. The primary hazard is the potential for reduced engine performance leading to increased collision risk, rather than direct physical injury to occupants.

Consumers with affected vehicles should take immediate action to have their pumps inspected and repaired by qualified technicians. The manufacturer offers free replacement services and provides a dedicated recall hotline for further questions. Given that no injuries have been documented and the hazard is theoretical (potential crash risk), this recall falls into a moderate severity category according to the established rubric, reflecting its status as a risk-of-harm product without confirmed injury reports.

The recalled product

Product
ENGINE AND ENGINE COOLING:COOLING SYSTEM:PUMP recall
Manufacturer
Nova Bus (US) Inc.
Category
Vehicle — Engine cooling system pump
Hazard
Affected units
25

Distribution

Distributed nationwide across the United States.

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