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Service bulletin 20-AT-025H

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10182317
Published by NHTSA2020-11-06
Manufacturer's number20-AT-025H
Manufacturer's date2020-10-13
NHTSA componentPOWER TRAIN

NHTSA's summary

This bulletin provides the procedure to update the TCU for vehicles that may exhibit a hesitation at acceleration particularly from a rolling stop condition. This update optimizes the TCU torque control logic.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Vehicles listed
HYUNDAI TUCSON2016, 2017, 2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20164362016-09-08. Powertrain
16V6280002016-08-30. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
24-AT-002H2024-04-16. Service bulletin. This TSB provides a procedure to diagnose and replace, if necessary, an automatic transmission with Incorrect Ratio DTC (transmission clutch slip in gear above limit) listed on Page 2.
23-01-014H-52023-09-06. Service bulletin. Hyundai has launched an anti-theft software upgrade and window decal campaign (Campaign 993), combined with an anti-theft steering wheel lock campaign (Campaign P32), in response to an increase in thefts of certain 2011-2022MY Hyundai vehicles not equipped with engine immobilizers targeted through social media. For certain vehicles that cannot be updated with the software (Campaign 993), Hyundai is offering customers steering wheel locks at the dealer (Campaign P32). This Dealer Best Practices Guide provides information to assist dealership personnel with customer questions relating to the immobilizer software upgrade, window decals and steering wheel lock ant-theft solutions available from HMA through Hyundai dealers.
22-AT-007H2022-06-10. Service bulletin. Certain vehicles (listed below) equipped with 7-speed Double Clutch Transmissions (DCT) may exhibit abnormal vibration at low speeds. This bulletin outlines the procedures for diagnosing clutch judder, updating the Transmission Control Unit (TCU) with revised logic, and/or replacing the Double Clutch.
21-AT-014H2021-09-17. Service bulletin. Certain vehicles (listed below) equipped with 7-speed Double Clutch Transmissions (DCT) may exhibit abnormal vibration at low speeds. This bulletin outlines the procedures for diagnosing clutch judder, updating the Transmission Control Unit (TCU) with revised logic, and/or replacing the Double Clutch.
21-AT-005H2021-03-05. Service bulletin. This bulletin provides service information for a vehicle that exhibits DTC P0507 “Idle Speed Control (ISC) System – RPM Higher than expected”.
20-AT-018H2020-06-06. Service bulletin. If you are servicing an applicable vehicle with the following symptoms and DTC, follow the Service Procedure on Page 3. • Check Engine light on • DTC P0880/P088000 - TCM Power signal error open/short • Transmission stuck in 4th gear fail-safe • Harsh shift into Drive and Reverse
20-AT-017H2020-06-06. Service bulletin. If you are servicing an applicable vehicle with the following symptoms and DTC, follow the Service Procedure on Page 4. • Check Engine light on • DTC P0880/P088000 - TCM Power signal error open/short • Transmission stuck in 4th gear fail-safe • Harsh shift into Reverse and Drive
DCT Dealer Best2020-06-06. Service bulletin. An informational brochure about the Dual Clutch Transmission was sent to Class Members of 2015-2017 model year Sonata Eco vehicles, 2016-2017 model year Tucson vehicles, and 2016-2017 model year Veloster vehicles equipped with a Dual Clutch Transmission.
20-AT-016H2020-05-07. Service bulletin. The automatic transmission warranty repair policy authorizes in-dealership repairs of the following components for both OEM (new) and remanufactured automatic transmissions:
20-AT-015H2020-05-07. Service bulletin. If you are servicing an applicable vehicle with a “Check Engine” light on and one or more of the DTC listed below, follow the repair procedure and replace the oil pressure harness.