What does this code mean?
The warm-up performance did not meet the monitor's expectation. Check coolant level only when the engine is cool, compare temperature readings from a cold start, and assess the thermostat and cooling-fan operation. Climate, sensor accuracy and vehicle calibration matter. Never open a hot pressurised cooling system.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
8Original wording in English
MITSUBISHI
Reported code forms P0128-00
This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault codes P0128-00, P2096-00 and P050A.
MITSUBISHI
Reported code forms P0128-00
This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault codes P0128-00, P2096-00 and P050A.
MITSUBISHI
Reported code forms P0128-00
This Service Campaign Bulletin sent to dealers provides instructions to reflash the ECU to address fault code P0128-00, and effective 6/26/2026, fault codes P2096-00 and P050A as well.
MITSUBISHI
Reported code forms P0128-00
This revised Technical Service Bulletin sent to dealers provides instructions to reflash the Engine Control Unit with updated software when a diagnostic code of P0128-00 is found.
MITSUBISHI
Reported code forms P0128-00
This revised Technical Service Bulletin sent to dealers provides instructions to reflash the Engine Control Unit with updated software when a diagnostic code of P0128-00 is found.
MITSUBISHI
Reported code forms P0128-00
This revised Technical Service Bulletin provides guidance when the check engine light is on with P0128-00 stored in the Engine ECU.
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Historical vehicle association; OBD-II compatibility is not established by this record.
| Make | Model | Model year |
|---|---|---|
| Mitsubishi | OUTLANDER | 2026 |
Historical records · 4 · Historical vehicle association; OBD-II compatibility is not established by this record.
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.
Sources and interpretation
These explanations are editorial summaries of the linked manufacturer material. PDF page numbers count from the first file page. Original publications are in English; translations are reference aids. A cited edition is not a claim that it is the manufacturer's latest instruction.
- 2024–2025 MY OBD System Operation Summary for Gasoline Engines ↗
Ford Motor Company · PDF page(s) 71 ·
Source check date · 2026-10-27
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.