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U0420

Code meaning and manufacturer information

OBD-II / DTC

Reference meaning

What does this code mean?

The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.

A code identifies a detected condition, not a part that must automatically be replaced.

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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Before replacing a part

Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.

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Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

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Manufacturer communications

22

Original wording in English

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SSM 54742 ↗

FORD

Some 2025-2026 Mustang GTD vehicles may set diagnostic trouble code (DTC) U0420:82 in the image processing module a (IPMA) during a diagnostic self-test. This may be due to the module's DTC sensitivity during vehicle key-on/start-up. Replacement or reprogramming of the IPMA module may not resolve this condition. If no other DTCs…

MERCEDES-BENZ

Complaint Either during PDI or after updating vehicle software, there may be: • "A+S" - Active and Stored DTC • "S" - Stored DTC Some known erroneous DTC's are: • C1016E0 with error ID: SIG_ESP_71 • B15BF00 with error ID: SIG_SEMA_C_22 • U0420E2 with error ID: SYS_EPS_22 • U041629 with error ID: SIG_ESP_12 • U013187 • U044229 Ca…

MERCEDES-BENZ

Complaint Either during PDI or after updating vehicle software, there may be: • "A+S" - Active and Stored DTC • "S" - Stored DTC Some known erroneous DTC's are: • C1016E0 with error ID: SIG_ESP_71 • B15BF00 with error ID: SIG_SEMA_C_22 • U0420E2 with error ID: SYS_EPS_22 • U041629 with error ID: SIG_ESP_12 • U013187 • U044229 Ca…

SSM 54206 ↗

FORD

Some 2025 Mustang GTD vehicles may set diagnostic trouble code (DTC) U0420:82 in the image processing module a (IPMA) during a diagnostic self-test. This may be due to the module's DTC sensitivity during vehicle key-on/start-up. Replacement or reprogramming of the IPMA module may not resolve this condition. If no other DTCs are …

Check vehicle applicability

47

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

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MakeModelModel year
BuickLACROSSE ↗2018
BuickLACROSSE ↗2017
ChevroletCOLORADO ↗2019
ChevroletCOLORADO ↗2016
ChevroletCOLORADO ↗2015
ChevroletMALIBU ↗2018
ChevroletMALIBU ↗2017
ChevroletMALIBU ↗2016

Can I keep driving?

A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.