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P code powertrain High severity

P1218 CID High

The OBD2 code P1218 CID High indicates a problem with the Charge Air Temperature Sensor, specifically that the sensor signal is higher than expected

Definition

The OBD2 code P1218 CID High indicates a problem with the Charge Air Temperature Sensor, specifically that the sensor signal is higher than expected

Common causes

  • Faulty fuel pressure regulator
  • Fuel delivery issues
  • Vacuum leaks
  • Faulty sensors (e.g., MAP, MAF)
  • Wiring or connector issues
  • Engine control module (ECM) problems
  • Injector issues

Common misdiagnoses

  • Faulty fuel injectors
  • Bad fuel pump
  • Clogged fuel filter
  • Vacuum leaks
  • Throttle body issues
  • Mass air flow sensor problems
  • Engine control module (ECM) failure
  • Ignition system faults
  • Exhaust gas recirculation (EGR) valve issues
  • Sensor wiring or connector problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing any related codes can help in diagnosing the issue more effectively

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors associated with the cylinder identification sensor. Look for signs of damage, corrosion, or loose connections that could affect the signal

  3. 3. Test the Cylinder Identification Sensor

    If applicable, test the cylinder identification sensor for proper operation. This may involve checking the resistance and voltage output of the sensor according to the manufacturer's specifications

  4. 4. Check Engine Grounds

    Ensure that all engine ground connections are secure and free of corrosion. Poor grounding can lead to erratic sensor readings

  5. 5. Inspect the ECM

    In some cases, the issue may lie with the Engine Control Module itself. Check for any signs of damage or water intrusion. If necessary, reflash or replace the ECM according to manufacturer guidelines

  6. 6. Look for Mechanical Issues

    Inspect the engine for any mechanical issues that could affect cylinder performance, such as a misfire, low compression, or fuel delivery problems

  7. 7. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  8. 8. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P1218 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in troubleshooting

  9. 9. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's make and model. Always refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the P1218 code, as they can vary by manufacturer and model