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P1308 – OBD-II DTC

OBD-II DTC P1308 – EGR Calibration Fault

DTC P1308 meaning

DTC P1308 refers to an EGR (Exhaust Gas Recirculation) calibration fault. This code indicates that the Engine Control Module (ECM) has detected a discrepancy in the EGR system’s performance or calibration. The EGR system is responsible for recirculating a portion of the exhaust gases back into the engine’s intake to reduce nitrogen oxide (NOx) emissions and improve fuel efficiency. When the ECM identifies that the EGR system is not functioning as expected, it triggers this diagnostic trouble code.

DTC P1308 symptoms

Common symptoms associated with DTC P1308 may include:

  • Check Engine Light illuminated
  • Decreased engine performance
  • Rough idling or stalling
  • Increased emissions
  • Poor fuel economy

DTC P1308 causes

Several factors can lead to the triggering of DTC P1308, including:

  • Faulty EGR valve
  • Blocked or clogged EGR passages
  • Faulty EGR position sensor
  • Vacuum leaks in the EGR system
  • Wiring issues or poor connections in the EGR circuit
  • Faulty ECM or software issues

DTC P1308 seriousness

The seriousness of DTC P1308 can vary depending on the underlying issue. While it may not cause immediate engine failure, it can lead to:

  • Increased emissions, which may cause the vehicle to fail emissions testing
  • Reduced engine performance, affecting drivability
  • Potential long-term damage to the engine if left unaddressed

How to diagnose DTC P1308

To diagnose DTC P1308, follow these steps:

  1. Use an OBD-II scanner to confirm the presence of the P1308 code.
  2. Check for any additional trouble codes that may provide more context.
  3. Inspect the EGR valve and its connections for any visible damage or blockages.
  4. Test the EGR position sensor for proper operation.
  5. Examine the EGR passages for clogs or restrictions.
  6. Check for vacuum leaks in the EGR system.
  7. Inspect the wiring and connectors related to the EGR system for damage or corrosion.
  8. Perform a functional test of the EGR system to ensure it operates correctly.

How to fix DTC P1308 step-by-step instructions

To fix DTC P1308, follow these steps:

  1. Clear the DTC using an OBD-II scanner.
  2. Inspect and clean the EGR valve if it is clogged.
  3. Replace the EGR valve if it is faulty.
  4. Repair or replace any damaged wiring or connectors in the EGR circuit.
  5. Clear any blockages in the EGR passages.
  6. Replace the EGR position sensor if it is not functioning correctly.
  7. Recheck the system for any new or recurring codes after repairs.

How to erase DTC P1308

To erase DTC P1308, follow these steps:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
  2. Turn on the ignition without starting the engine.
  3. Access the scanner’s menu and select the option to clear or erase trouble codes.
  4. Confirm the action and wait for the scanner to complete the process.
  5. Disconnect the scanner and start the engine to ensure the code does not return.

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