Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis Procedure
- CHECK DTC PRIORITY
If DTC P2138 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.
Is DTC P0643 detected?
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Perform diagnosis for P0643. Refer to DTC Description .
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GO TO 2.
- CHECK APP SENSOR 1
Check APP sensor 1. Refer to Diagnosis Procedure .
Is the inspection result normal?
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GO TO 3.
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Repair or replace error-detected parts.
- CHECK APP SENSOR 2
Check APP sensor 2. Refer to Diagnosis Procedure .
Is the inspection result normal?
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GO TO 4.
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Repair or replace error-detected parts.
- CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Refer to Diagnosis Procedure .
Is the inspection result normal?
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Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .
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Repair or replace error-detected parts.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.