What causes fault code P0375?

• Most likely: Faulty High Resolution Sensor 'B' (Optical or Hall-effect) • Likely: Wiring harness issues (chafed wires, corrosion, or poor grounding) • Possible: Electromagnetic Interference (EMI) from ignition components or alternator • Rare: Internal PCM/ECM failure

How do you fix fault code P0375?

STEP 1: Inspect the sensor connector for corrosion or loose pins. Clean with specialized contact cleaner. STEP 2: Inspect wiring harness for physical damage or EMI sources. Verify reference voltage (usually 5V or 12V) and ground integrity (should be less than 0.1V). STEP 3: Use an oscilloscope to back-probe the signal wire. Observe the waveform; it should be a consistent square wave without noise or missing pulses. STEP 4: If the signal is erratic despite good power and ground, replace the High Resolution Timing Sensor/Distributor.

Powertrain (Engine & Gearbox)Standard EOBD

P0375 - Timing Reference High Resolution Signal 'B' Intermittent/Erratic

Q: What are the symptoms of fault code P0375?

• Check engine light (MIL) illumination • Engine hesitation or jerking during acceleration • Hard starting conditions • Engine stalling intermittently • Reduced engine power and poor fuel economy

Last updated:1 February 2026

Related:High Resolution Timing Sensor, Crankshaft Position Sensor (CKP), Camshaft Position Sensor (CMP), PCM/ECM, Distributor Assembly

System

Powertrain (Engine & Gearbox)

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P0300

Random or Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

P0375 is a generic diagnostic trouble code indicating that the Powertrain Control Module (PCM) has detected an intermittent or erratic signal from the high-resolution timing reference sensor 'B'. This sensor provides precision pulses to the PCM to accurately determine engine position for fuel injection and ignition spark timing. If the PCM detects missing pulses or an inconsistent pulse frequency that does not match the low-resolution signal (Sensor A), it triggers this code. This disruption causes loss of synchronization, potentially leading to 'Limp Home' mode or engine stalling.

Possible Causes

Faulty High Resolution Sensor 'B' (Optical or Hall-effect)

Wiring harness issues (chafed wires, corrosion, or poor grounding)

Electromagnetic Interference (EMI) from ignition components or alternator

Internal PCM/ECM failure

Symptoms

Check engine light (MIL) illumination

Engine hesitation or jerking during acceleration

Hard starting conditions

Engine stalling intermittently

Reduced engine power and poor fuel economy

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P0375 - Timing Reference High Resolution Signal 'B' Intermittent/Erratic

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P0375 - Timing Reference High Resolution Signal 'B' Intermittent/Erratic

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