This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
Definition
P0249 is a diagnostic error code for the wastegate turbocharger solenoid "B" High Circuit. If a high voltage condition is detected in the circuit controlling the wastegate solenoid "B", which may affect the performance and efficiency of a turbocharged engine, this code shall be stored in the engine control module ECM.
Meaning
In simpler terms, the P0249 code indicates that there is a problem with the wastegate solenoid "B" circuit, which leads to excessive control of the boost pressure of the turbocharger. This may cause damage to the engine, as well as a decrease in performance and fuel efficiency.
Causes
Effective diagnosis and repair of the P0249 code depend on an understanding of its possible causes. Typical reasons include
- Faulty Wastegate Solenoid "B": A high voltage situation in the circuit may result from a faulty wastegate solenoid "B".
- Wiring Issues: Excessive voltage can be caused by corroded or damaged connections and wiring in the wastegate solenoid "B" circuit.
- Faulty ECM: An erroneous P0249 code might occasionally be caused by an ECM that isn't working properly.
Symptoms
If you recognize symptoms that relate to the P0249 code, this may help determine what is going on. Common symptoms include:
- Excessive engine power
- Rapid acceleration
- Reduced fuel efficiency
- Illuminated check engine light
- Increased exhaust emissions
Diagnosis
The P0249 code must be correctly diagnosed using a methodical methodology. The steps are as follows:
- Code Scanning: Retrieve the P0249 code and any supplementary codes* using an OBD-II scanner.
- Visual Inspection: Check for damage or corrosion on the wastegate solenoid "B" and its wiring.
- Testing the Solenoid "B": Check the wastegate solenoid "B"'s resistance to make sure it complies with the manufacturer's requirements.
- Wiring Inspection: Verify the circuit's wiring and connections for continuity and fix any broken parts.
- ECM check: Consider testing or replacing the ECM once other explanations have been ruled out.
Common mistakes
When working with the P0249 error code, avoid making these typical mistakes:
- Neglecting Other Codes: Don't focus solely on P0249; check for additional codes that may provide valuable diagnostic information.
- Replacing Parts Unnecessarily: Proper diagnosis is key to avoiding unnecessary part replacements. Always follow a systematic approach.
How serious is this?
The severity of the P0249 code depends on the extent of the issue. It may not be possible to immediately put your vehicle out of action, but this could cause excessive engine stress and lead to damage over time. If the code is not followed, it may lead to a higher cost for repairs in the future, and this should be dealt with immediately.
What repairs can fix the codeS?
Once the problem has been identified, the necessary repairs can be made:
- Change Wastegate Solenoid "B" as follows: Replace the solenoid "B" with a new one if it is defective.
- Repair or Replace wire: Replace any rusted or damaged connections and wire.
- ECM Replacement: If it is found that the ECM is the problem, replace or reprogram it as appropriate.
Related codes
Other relevant codes that may be attached to P0249 include:
- P0246: Turbocharger Wastegate Solenoid "A" Performance
- P0247: Turbocharger Wastegate Solenoid "A" Low Circuit
- P0248: Turbocharger Wastegate Solenoid "B" Low Circuit
Conclusion
The P0249 DTC code may be properly diagnosed and corrected as early as possible, even though it is potentially problematic. In the long term, ignoring that code may increase engine strain and repair costs.
If you encounter the P0249 code or suspect any related issues, seek professional assistance promptly to ensure your vehicle's optimal performance and efficiency are restored.
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