Timing Reference High Resolution Signal B Too Many Pulses
The P0374 code means the vehicle's onboard diagnostic system has detected: Timing Reference High Resolution Signal B Too Many Pulses. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $100 - $600 (parts and labor)
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What Are the Symptoms of P0374?
- Check Engine Light on
- Erratic engine performance
- Possible stalling
- Ignition timing errors
What Causes P0374? (Most Likely First)
- Metallic debris on camshaft reluctor Very High
- Faulty cam position sensor B High
- EMI on sensor wiring Moderate
- Loose sensor mounting Low
Can I Still Drive with P0374?
No — stop driving. P0374 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What causes extra camshaft sensor pulses?
Usually metallic debris stuck to the sensor or reluctor, a loose sensor vibrating and creating noise, or electrical interference on the signal wire.
How do I clean the reluctor wheel?
Remove the sensor and carefully clean the reluctor teeth with a rag. Use a magnet to remove metal particles. Avoid damaging the teeth.
Can P0374 cause timing to be wrong?
Yes, extra pulses can confuse the PCM about camshaft position, leading to incorrect ignition and fuel injection timing.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0374?
-
Inspect camshaft reluctor for debris.
-
Check sensor mounting torque.
-
Review wiring routing for EMI sources.
-
View sensor waveform on oscilloscope.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0374?
- 2010-2020 Ford Edge (3.5L V6)
- 2012-2019 Nissan Murano (3.5L V6)
- 2008-2018 Chevrolet Equinox (3.6L V6)
- 2011-2020 Toyota Sienna (3.5L V6)
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