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Service bulletin 08-01-012

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 id10026772
Published by NHTSA2008-12-16
Manufacturer's number08-01-012
Manufacturer's date2008-08-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE

NHTSA's summary

HYUNDAI: ECM UPDATE: 2009 GENESIS DTC P2135 LOGIC IMPROVEMENT. TO IMPROVE THE DTC P2135 THROTTLE POSITION SENSORS 1/2 VOLTAGE CORRELATION DIAGNOSTIC LOGIC ON SOME VEHICLES SOFTWARE UPDATE. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Trouble codes named

P2135

Vehicles listed
HYUNDAI GENESIS2009

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

Other bulletins for the same vehicles and component
26-EM-015H TSB2026-10-13. Service bulletin. Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides the inspection and repair procedures for vehicles exhibiting this condition. All internal combustion engines consume engine oil as part of normal engine operation. Oil consumption rates may vary based on mileage, operating conditions, driving habits, and maintenance history. Hyundai recommends following the prescribed maintenance schedule and periodically checking the engine oil level using the dipstick to maintain proper engine oil level.
23-EM-005H2023-12-15. Service bulletin. This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.
22-EM-010H2022-08-05. Service bulletin. Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly replacement.
22-BR-001H2022-04-08. Service bulletin. The warranty coverage for the hydraulic electronic control unit (HECU) for certain Genesis (BH) and Equus (VI) vehicles for repairs and replacement has been extended to 15 years with unlimited miles from the date of original retail delivery or date of first use, and is valid for original and subsequent owners.
21-EM-004H2021-04-07. Service bulletin. This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps.
21-EM-003H2021-04-06. Service bulletin. This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.
TSB-10-FL-0102010-12-15. Service bulletin. HYUNDAI: DTC P2135/P0638 OR COLD ENGINE RPM FLUCTUATION; TPS REPLACEMENT AND ECM UPDATE. SOME 2.7L, 3.3L OR 3.8L ENGINES IN MODELS IDENTIFIED IN THE APPLICABILITY LIST MAY EXPERIENCE ONE OR MORE OF THE CONDITIONS LISTED. *PE
TSB-10-01-0252010-11-19. Service bulletin. HYUNDAI: ECM UPDATE-MIL ON WITH DTC P0456. SOME VEHICLES MAY EXPERIENCE MALFUNCTION INDICATOR LAMP ILLUMINATION FOR DTC P0456 (EVAPORATIVE EMISSION SYSTEM-VERY SMALL LEAK DETECTED). *PE
TSB-09-FL-0092010-02-02. Service bulletin. HYUNDAI: ECM UPDATE. MIL ON WITH DTC P0456. SOME VEHICLES MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP ILLUMINATION FOR DTC P0456 (EVAPORATIVE EMISSION SYSTEM - VERY SMALL LEAK DETECTED). *PE