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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0340: CAMSHAFT POSITION SENSOR CIRCUITTEST DESCRIPTION
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Test Description
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Test Description
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step number in the diagnostic procedures.
- 2
This step determines if the 12 volts reference circuit to the CKP "A", the CKP "B" and the CMP is shorted to a ground. If all 3 DTCs are set, this indicated the circuit is shorted to a ground or a sensor is internally shorted. All 3 DTCs set because the 12 volt reference circuit is internally connected within the PCM. The engine will not start with this condition. - 8
This step determines if the CMP sensor is shorted internally. If the 12 volt reference parameter changes from Fault to OK, the conditions is with the sensor. - 9
This step determines if the CKP "A" sensor is shorted internally. If the 12 volt reference parameter changes from Fault to OK, the condition is with the sensor. - 10
This step determines if the CKP "B" sensor is shorted internally. If the 12 volt reference parameter changes from Fault to OK, the conditions is with the sensor.
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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.