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.
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HOMESERVICE MANUALSCHEVROLET2015SILVERADO 1500 HIGH COUNTRY, 5.3L ENG VIN C, RWD, GASREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 28 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1346: INTAKE CMP SYSTEM PERFORMANCETEST DESCRIPTION
2015 Chevrolet Silverado 1500 High Country, 5.3L Eng VIN C, RWD, Gas
Test Description
2015 Chevrolet Silverado 1500 High Country, 5.3L Eng VIN C, RWD, GasSECTION Test Description
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 1 - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in scan tool for later reference.
- 3 - This step checks operation of CMP actuator system. When commanded ON, CMP actuator solenoid advances the camshaft, usually causing engine to stall.
- 4 - This step visually inspects operation of CMP actuator solenoid valve. Solenoid plunger and spool valve movement should be smooth and rapid from extended to retracted.
RENDER: 1.0x
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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.