Understanding OBD2 Code P1247: Turbo/Super Charger Boost Sensor A Circuit Low

The dreaded OBD2 code P1247 can leave drivers scratching their heads. This code indicates a problem with your vehicle’s turbocharger or supercharger boost sensor A circuit, signaling low voltage. Don’t panic, this comprehensive guide will walk you through everything you need to know about the P1247 code, from its causes and symptoms to diagnostic procedures and solutions.

What Does OBD2 Code P1247 Mean?

The P1247 diagnostic trouble code (DTC) specifically points to an issue within the boost sensor “A” circuit. This sensor is crucial for measuring the pressure created by the turbocharger or supercharger, which is then relayed to the engine control unit (ECU). A low voltage reading suggests the sensor isn’t sending the correct information to the ECU, potentially leading to performance issues.

Common Symptoms of P1247

Experiencing a P1247 code can manifest in various ways, impacting your vehicle’s performance and drivability. Some common symptoms include:

• Reduced engine power: Your car might feel sluggish or lack its usual acceleration.
• Limp mode: The ECU might activate limp mode to protect the engine, significantly limiting power output.
• Check engine light: The infamous check engine light will illuminate on your dashboard.
• Unusual engine noises: You might hear hissing or whistling sounds from the turbocharger/supercharger system.
• Poor fuel economy: Inefficient boost pressure can lead to increased fuel consumption.

What Causes the P1247 Code?

Several factors can contribute to the P1247 OBD2 code. Understanding these potential causes can help you pinpoint the issue more effectively:

• Faulty boost sensor: A malfunctioning boost sensor might send incorrect voltage signals to the ECU.
• Wiring problems: Damaged, corroded, or loose wiring in the sensor circuit can disrupt the signal transmission.
• Vacuum leaks: Leaks in the intake system can affect boost pressure and trigger the code.
• Turbocharger/supercharger issues: Problems with the turbocharger or supercharger itself, such as worn bearings or a damaged wastegate, can also cause the P1247 code.
• ECU problems: In rare cases, a faulty ECU can misinterpret sensor readings.

Diagnosing OBD2 Code P1247

Diagnosing the P1247 code requires a systematic approach. Here’s a step-by-step guide:

1. Retrieve the code: Use an OBD2 scanner to confirm the presence of the P1247 code and any other related codes.
2. Inspect the boost sensor: Check the sensor for any signs of damage or contamination.
3. Check the wiring: Inspect the wiring harness for any breaks, corrosion, or loose connections.
4. Test the sensor voltage: Use a multimeter to measure the voltage at the sensor connector.
5. Check for vacuum leaks: Inspect the intake system for any leaks using a smoke test or a pressure tester.
6. Test the turbocharger/supercharger: Inspect the turbocharger/supercharger for any mechanical issues.

How to Fix OBD2 Code P1247

Once you’ve diagnosed the root cause, you can address the issue accordingly:

• Replace the boost sensor: If the sensor is faulty, replacing it is usually a straightforward solution.
• Repair or replace the wiring: Damaged wiring needs to be repaired or replaced to ensure proper signal transmission.
• Fix vacuum leaks: Seal any leaks in the intake system to maintain proper boost pressure.
• Repair or replace the turbocharger/supercharger: If the turbocharger/supercharger is damaged, it might require repair or replacement.
• Address ECU problems: In rare cases, the ECU might need to be reprogrammed or replaced.

What if the P1247 Code Returns After Repair?

If the P1247 code reappears after the initial repair, it suggests the problem wasn’t fully resolved. Double-check all connections and components related to the boost sensor circuit. Consider consulting a qualified mechanic for further diagnostics.

Conclusion

Understanding the OBD2 code P1247 is crucial for maintaining the performance and reliability of your turbocharged or supercharged vehicle. By following the diagnostic and repair steps outlined in this guide, you can effectively address the underlying issue and get your car back on the road. Remember, addressing the P1247 code promptly can prevent further damage to your engine.

FAQ

1. Can I drive with a P1247 code? It’s not recommended to drive extensively with this code, as it can lead to further engine problems.
2. How much does it cost to fix P1247? The cost can vary depending on the specific cause and repair required.
3. Is P1247 a serious problem? While not immediately catastrophic, ignoring the P1247 code can lead to more serious engine damage over time.
4. Can a bad battery cause a P1247 code? While unlikely, a severely discharged battery can sometimes cause erratic sensor readings.
5. How often should I check my OBD2 codes? It’s a good practice to check your codes periodically, especially if you notice any performance issues.
6. Can I fix the P1247 code myself? If you have some mechanical experience, you might be able to address simple issues like wiring problems or sensor replacement. However, more complex problems might require professional assistance.
7. What other codes are related to P1247? Related codes might include P0234 (Turbo/Super Charger Overboost Condition), P0236 (Turbo/Super Charger Boost Sensor A Circuit Range/Performance), and P0237 (Turbo/Super Charger Boost Sensor A Circuit Low Input).

Need more assistance with your car diagnostics? Check out our other helpful articles on OBD2 codes and car maintenance.

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