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 MANUALSCHEVROLET2002EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - ENGINE RUNS ROUGH/MIL ON/DTC'S SET
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Engine Controls - Engine Runs Rough/MIL ON/DTC's Set
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Engine Controls - Engine Runs Rough/MIL ON/DTC's Set
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 02-06-04-059
Date: December, 2002
TECHNICAL
Subject:
Engine Runs Rough, Service Engine Soon Light On, DTC's P0300 or P0335 Set (Shim Crankshaft Sensor)
Models:
2002-03 Chevrolet Astro, Blazer, Express, Silverado and S-10 Truck Models 2002-03 GMC Jimmy, Safari, Savana, Sierra and Sonoma Truck Models with 4.3L V-6 Engine (VINs W, X - RPOs L35, LU3)
Condition
Some owners may comment on a rough running condition or a Service Engine Soon (SES) light being illuminated. Upon investigation, the technician may find a DTC code P0300 or P0335.
Cause
The crankshaft sensor may be contacting the reluctor wheel.
Correction
Remove the crankshaft sensor. Refer to the Crankshaft Position Sensor Replacement procedure in the Engine Controls-4.3L sub-section of the Service Manual. After removing the sensor, inspect the end of it for witness marks that would indicate contact with the crankshaft. If contact with the reluctor ring is indicated, then inspect the front cover for cracking or other signs of alignment concerns. If the inspection indicates that the cover is causing mis-alignments, replace the cover. If replacing the cover, then the 0.5 mm shim is not needed.
If the inspection of the front cover indicates that the cover is not the cause of mis-alignments, then the sensor should be shimmed. Add one shim between the sensor and the front cover. If the concern still exists, then add the second shim. Unless the sensor has been rubbed through the casing or deformed by contact with the crankshaft, it should not be replaced.
In either case, the crankshaft relearn procedure should be performed after any repairs.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
Bulletin No.: 02-06-04-059
Date: December, 2002
TECHNICAL
Subject:
Engine Runs Rough, Service Engine Soon Light On, DTC's P0300 or P0335 Set (Shim Crankshaft Sensor)
Models:
2002-03 Chevrolet Astro, Blazer, Express, Silverado and S-10 Truck Models 2002-03 GMC Jimmy, Safari, Savana, Sierra and Sonoma Truck Models with 4.3L V-6 Engine (VINs W, X - RPOs L35, LU3)
Condition
Some owners may comment on a rough running condition or a Service Engine Soon (SES) light being illuminated. Upon investigation, the technician may find a DTC code P0300 or P0335.
Cause
The crankshaft sensor may be contacting the reluctor wheel.
Correction
Remove the crankshaft sensor. Refer to the Crankshaft Position Sensor Replacement procedure in the Engine Controls-4.3L sub-section of the Service Manual. After removing the sensor, inspect the end of it for witness marks that would indicate contact with the crankshaft. If contact with the reluctor ring is indicated, then inspect the front cover for cracking or other signs of alignment concerns. If the inspection indicates that the cover is causing mis-alignments, replace the cover. If replacing the cover, then the 0.5 mm shim is not needed.
If the inspection of the front cover indicates that the cover is not the cause of mis-alignments, then the sensor should be shimmed. Add one shim between the sensor and the front cover. If the concern still exists, then add the second shim. Unless the sensor has been rubbed through the casing or deformed by contact with the crankshaft, it should not be replaced.
In either case, the crankshaft relearn procedure should be performed after any repairs.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
RENDER: 1.0x
NO RELATED
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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.