Warranty Return & Processing Policy

At Thompson Diesel Performance (TDP), we stand behind the quality of our products and take every warranty claim seriously. To ensure proper inspection and accurate resolution, all returned units must go through our internal evaluation process.

Processing Time:

Please allow up to 30 business days from the date we receive your unit for full inspection, diagnosis, and warranty processing. This timeframe is necessary to properly disassemble, inspect, and verify the condition of all components.

Important Notes:

Processing time begins only after the unit has been received at our facility.

All units are thoroughly inspected for installation errors, contamination, tuning-related issues, and component failure.

Warranty determinations will be made after complete teardown and evaluation.

Additional time may be required depending on workload, parts availability, or extent of damage.

We understand downtime is critical and we work as efficiently as possible, but we will not rush inspections at the expense of accuracy. This ensures every customer receives a fair and properly documented warranty decision.

A RMA (Return Merchandise Authorization) number is required, and must be written on the outside shipping carton.

• Returns must be packaged securely in an outer carton
• Do not write on the product packaging itself. Write only on the outer shipping carton.
• Packages received without a Return Authorization Number written clearly on the outer carton will be refused.
• Returnable items must be received by Thompson Diesel Performance within 30 days of the product being received by you the customer. (determined by UPS Tracking info)
• Returned product must be in new, re-saleable condition, with all original boxes, packaging, parts, cables, manuals, etc.
• Upon receipt, all returns will be inspected, and, at our discretion, credit may be refused or a restocking fee of 30% may be assessed.
• Original shipping cost and shipping insurance charges are non-refundable.
• Customer is responsible for shipping costs incurred to return products.
• Products can only be returned for a refund, store credit, or an exchange for the same item. Product cannot be exchanged for a different part number.

• Product has been installed and/or used
• Product has been damaged from an attempt to be installed and/or used
• Product is shipped back without original box, manual and/or parts
• Seal on electrical parts is broken
• Product serial number does not match that of which was original shipped to buyer
• Product is deemed not resell able by Thompson Diesel Performancec due to customers own actions in dealing with the product