What Does P0375 Mean?
The ECM has detected a malfunction in the timing reference high-resolution signal B circuit. On engines with dual crankshaft position sensors or a separate camshaft-driven timing reference, this indicates the secondary (B) sensor is not providing a valid signal. The engine may run poorly with degraded timing accuracy, exhibit misfires, or fail to start if the ECM cannot determine crankshaft position from the remaining sensor alone.
Safety Warning
A complete loss of the timing reference B signal may cause the engine to stall or prevent starting. If the ECM can compensate using sensor A, performance will be degraded. Do not rely on the vehicle for critical trips until repaired, as the backup strategy may fail at any time.
Common Causes
35%
Failed timing reference sensor B (open or shorted internally)
30%
Broken or shorted wiring in the sensor B circuit
15%
Damaged or misaligned reluctor ring for sensor B
15%
Corroded or contaminated sensor B connector
5%
ECM internal circuit failure on the sensor B input
Diagnostic Steps
1
Verify the presence of the timing reference signal B using live data. Check if the ECM reports 0 RPM or no signal from the B sensor while the engine is running.
2
Unplug the sensor B connector and measure sensor resistance with a DVOM. For a magnetic (VR) sensor, expect 500-1500 ohms; for a Hall-effect sensor, verify 5V reference and ground at the connector.
3
Check for proper voltage signals at the ECM connector for the sensor B input pins. With a magnetic sensor, spin the engine with the starter and verify AC voltage output (typically >0.3V AC).
4
Inspect the wiring harness from the sensor to the ECM for opens, shorts to ground, or shorts to power. Pay special attention to areas near heat sources and moving engine components.
5
Examine the reluctor ring or tone wheel associated with sensor B for physical damage, cracks, or missing teeth. Verify proper sensor-to-reluctor air gap (typically 0.5-1.5mm).
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the timing reference high-resolution signal B circuit. On engines with dual crankshaft position sensors or a separate camshaft-driven timing reference, this indicates the secondary (B) sensor is not providing a valid signal. The engine may run poorly with degrad...
The most common cause of P0375 (Timing Reference High Resolution Signal B Malfunction) is: Failed timing reference sensor B (open or shorted internally)
Typical repair costs for P0375 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A complete loss of the timing reference B signal may cause the engine to stall or prevent starting. If the ECM can compensate using sensor A, performance will be degraded. Do not rely on the vehicle for critical trips until repaired, as the backup strategy may fail at any time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0375 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition / Engine Timing System
Difficulty
Type
Generic (SAE)
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