In May 2024, UD Trucks filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Exhaust Gas Reduction System, covering the Quon. The filing affects 11 vehicles manufactured between March 15, 2021 and August 2023.
Overview
| MLIT filing number | 1154680 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | May 21, 2024 |
| Manufacturer(s) | UD Trucks |
| Component | Exhaust Gas Reduction System |
| Production period | March 15, 2021 — August 2023 |
| Vehicles affected | 11 units |
Filing in context
This is the only filing in the archive that cites the Exhaust Gas Reduction System as the affected component. This filing is one of 17 UD Trucks notifications from 2024 in this archive. For scale, 4,581 of the 4,890 filings in this archive report a larger number of affected vehicles; the vehicles involved here were manufactured over a span of about 2 years and 5 months.
Defect
On vehicles where the urea solution tank has been relocated, the waterproofing treatment on the extension harness and connectors is inadequate, allowing rainwater to enter the connectors and corrode the terminals. If a continuity fault develops at the corroded terminals, communication between the after-treatment control module (ACM) mounted on the urea solution tank and the engine control module (ECM) is interrupted, causing the selective catalytic reduction (SCR) system to become inoperative and triggering a "Vehicle Electrical Control System Malfunction" warning message on the instrument cluster center display. Continued driving under this condition may cause nitrogen oxide (NOx) emissions in the exhaust to exceed the regulatory limit.
Corrective action
On all vehicles, inspect each connector on the urea solution tank extension harness and install the waterproof plugs in the correct position. If corrosion is found inside a connector, replace the affected extension harness and the mating harness with new parts.
Affected models & chassis ranges
This filing lists 8 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.
| Type code (型式) | Model | Chassis ranges |
|---|---|---|
| 2PG-CW5AL | QUON | JNCMBP0D5MU060520 |
| 2PG-CW5BL | QUON | JNCMB02D2NU071710 |
| 2PG-GK5AAD | QUON | JNCMB22A1NU074583 |
| 2PG-GK5AAE | QUON | JNCMBP0A7NU074667 |
| 2RG-CG5FA | QUON | JNCMC10G4PU084865 — JNCMC10G3PU084940 |
| 2RG-CG5FE | QUON | JNCMC10G3PU079432 |
| 2RG-CW5EL | QUON | JNCMC20DXPU082601 |
| 2RG-CW5FL | QUON | JNCMC10D8PU077021 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
尿素水タンクを移設した車両において、延長ハーネス及びコネクタの防水処理が不適切なため、コネクタ内に雨水等が浸入し端子部を腐食させることがある。そのため、接続端子部で導通不良が発生すると、尿素水タンクに装着された後処理制御モジュール（ＡＣＭ）等とエンジン制御モジュール（ＥＣＭ）間における通信が途絶え、排出ガス後処理装置（ＳＣＲ）が不作動状態になると共に、インストルメントクラスタ中央ディスプレイに“車両電制システム異常”の警告メッセージが表示される。そのまま走行を続けると、排出ガス中の窒素酸化物（ＮＯｘ）の排出値が基準値を超えるおそれがある。
改善措置
全車両、尿素水タンク延長ハーネスの各コネクタ部を点検し、防水プラグを適正位置に取付ける。なお、コネクタ内部に腐食がある場合には、当該延長ハーネスと接続側のハーネスを新品と交換する。
Source & verification
This entry reproduces public data from Japan's MLIT recall registry. English text is jdmvin.com's own translation; always verify against the official source:
https://renrakuda.mlit.go.jp/renrakuda/ris-detail-car.html?class=recalldatacar&id=3009707
Related recalls
Same manufacturer, close in filing date
Other UD Trucks filings closest to this one by filing date.
Wiring — affects 1,295 vehicles.
Open recall detail →Pressure Control and Transmission Component — affects 27 vehicles.
Open recall detail →Computer (Engine Control) — affects 26,654 vehicles.
Open recall detail →Other (body structure) — affects 645 vehicles.
Open recall detail →Vehicle Body — affects 2,544 vehicles.
Open recall detail →All UD Trucks recalls · All 2024 recalls · Recall Archive home