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6/1/22, 2:40 PM
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USE FOR NEW VEHICLES (US21+OBD22 Emissions) Intermittent Diagnostic Trouble Codes U02A3,
U029D, U029E
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Vehicles manufactured with US21+OBD22 emissions, most often 2023
model year, may set the following Diagnostic Trouble Codes:
• U02A300 – PM sensor missing signal
• U029D00 – NOx Inlet (NOx1) sensor missing signal
• U029E00 – NOx Outlet (NOx2) sensor missing signal
This has been determined to be a software error in the timing of
component initialization at startup and occurs if the vehicle is started
immediately after Key On.
If these three codes above are coming active under the
conditions described above on an applicable vehicle:
1. Perform a DTC clear using Premium Tech Tool (PTT) to clear
inducement conditions.
2. Under the Test tab in PTT, run operation 2589-08-03-05 SCR Dosing
System Test to clear any existing derate conditions.
3. Inform the customer that to prevent these codes from setting, when
starting the vehicle they should:
3.1. Turn the ignition to Key On.
3.2. Wait five seconds.
3.3. Start the vehicle as normal.
A software update will be released mid to late 2022 to remedy this issue.
This solution will be updated when more information is available.
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6/1/22, 2:40 PM
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