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.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P2181Cooling System Performance has been setP2181COOLING SYSTEM PERFORMANCEP2181Cooling System Performance has been setP2181Cooling System Performance recorded in PCM memoryView all · Manufacturer wording →
Manufacturer communications
86Original wording in English
BENTLEY
Reported code forms P218100
Engine cooling system over cooling - One or a combination of DTC's may be evident P218100 - P1BB400.
HYUNDAI
Reported code forms P218100
Some Elantra (CN7) vehicles equipped with the 2.0L AKS NU PE engine may exhibit an illuminated Check Engine light for diagnostic trouble code (DTC) P218100 or P013300 which are related to the Integrated Thermal…
HYUNDAI
Reported code forms P218100 P2181F0 P2181F1
Some Santa Fe (TMA) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit (ECU), resulting in an illuminated Check Engine warning lamp. Follow the…
HYUNDAI
Reported code forms P218100 P2181F0 P2181F1
Some Tucson (NX4, NX4A) vehicles may have DTC P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit (ECU), resulting in an illuminated Check Engine warning lamp. This TSB…
HYUNDAI
Reported code forms P218100 P2181F0 P2181F1
Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Engine Control Module, resulting in an illuminated Check Engine warning lamp. Follow the procedure…
HYUNDAI
Reported code forms P218100
Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated…
Check vehicle applicability
249A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A3 | 2020 |
| Audi | A3 | 2019 |
| Audi | A3 CABRIOLET | 2019 |
| Audi | A4 | 2020 |
| Audi | A4 | 2019 |
| Audi | A4 | 2018 |
| Audi | A4 | 2017 |
| Audi | A6 | 2023 |
| Audi | A6 | 2020 |
| Audi | A6 | 2019 |
| Audi | A6 | 2018 |
| Audi | A6 ALLROAD | 2023 |
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.
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.