Crankshaft position sensor 3X reference circuit fault
What it means
P1374. Crankshaft position sensor 3X reference circuit fault. High to low resolution signals do not agree. This Chevy-enhanced code applies to Silverado, Sierra with 4.3L V6, 5.0L, 5.7L V8 1996 to 1999. S10, Blazer with 4.3L V6..
Findings, check these first
- Faulty crankshaft position sensor
- Damaged sensor wiring
- Loose ignition control module connector
- Faulty ignition control module
- Corroded ground circuit
Standard procedure
- Inspect sensor wiring and connector
- Check ignition module connections
- Test crank sensor signal
- Test ignition control module
- Replace faulty sensor or module
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Sources and review
Review: checked against the recorded source material.
- OBDII Code P1374 CHEVROLET - 3X Reference Circuit | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and Chevrolet application
Fetched directly. 3X reference circuit matches the catalog crankshaft position 3X reference wording. Model and year fitment remain curator claims.
Last updated 2026-09-25.
Report a correction for P1374. Include your vehicle, the issue and a source if you have one.
This fault is part of the Chevy P1xxx fuel and ignition codes guide. It covers the family and the order to check it.