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.
Scan worksheet →Manufacturer communications
3Original wording in English
FORD, LINCOLN
Some 2025-2026 Explorer/Aviator vehicles may exhibit a no crank/no start/discharged battery condition with diagnostic trouble codes (DTC) B144D:29, B144E:29, B1555:29, B1556:29 and/or U3003:16 stored in the rear gate trunk module (RGTM). The power liftgate may also be inoperative. This may be due to water intrusion into the left…
FORD, LINCOLN
Some 2020 Explorer/Aviator vehicles built on or before 17-Feb-2020 may exhibit an intermittent partial opening of the power liftgate and/or false activation of the anti-theft alarm with diagnostic trouble codes (DTCs) B144D, B144E, B1555 and/or B1556 stored in the rear gate trunk module (RGTM). This may be due to the software in…
CADILLAC
THIS BULLETIN IS BEING ISSUED TO REVISE DIAGNOSTIC TROUBLE CODES B1552, B1556 AND B1558. *TT
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Cadillac | ELDORADO ↗ | 2002 |
| Cadillac | ELDORADO ↗ | 2001 |
| Cadillac | ELDORADO ↗ | 2000 |
| Ford | EXPLORER ↗ | 2026 |
| Ford | EXPLORER ↗ | 2025 |
| Ford | EXPLORER ↗ | 2020 |
| Lincoln | AVIATOR ↗ | 2026 |
| Lincoln | AVIATOR ↗ | 2025 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Ignition Run/Start Circuit Open
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.