Timing Reference High Resolution Signal B Intermittent
The P0376 code means the vehicle's onboard diagnostic system has detected: Timing Reference High Resolution Signal B Intermittent. 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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Common Symptoms
- Intermittent Check Engine Light
- Random misfires
- Occasional stalling
- Hesitation under acceleration
Probable Causes (Ranked by Likelihood)
- Intermittent cam position sensor B failure Very High
- Loose or corroded connector High
- Cracked wiring at flex point Moderate
- Cam sensor B failing under heat Low
Step-by-Step Diagnostic Procedure
-
Monitor cam sensor B signal while driving. Watch for dropouts.
-
Wiggle test connector and wiring.
-
Check for heat-related failures by monitoring during warm-up.
-
Inspect connector pins.
Frequently Asked Questions
Why is the cam sensor failing intermittently?
Heat, vibration, and age degrade the sensor and its connections. The sensor may work when cold and fail when hot.
How do I catch an intermittent cam sensor failure?
Connect a scan tool and drive while monitoring cam sensor data. Record the data and look for momentary signal loss.
Should I replace the sensor or repair wiring?
Diagnose first with the wiggle test. If the connector is the issue, repair it. If the sensor is failing under heat, replace the sensor.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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