Timing Reference High Resolution Signal B Malfunction
The P0375 code indicates a malfunction in the high-resolution timing reference signal B, which is used by the powertrain control module (PCM) to monitor engine timing and crankshaft position. This signal is typically generated by a crankshaft position sensor or a camshaft position sensor. A failure can cause incorrect fuel injection and ignition timing, leading to poor engine performance.
1. Most Common Causes
- Faulty crankshaft position sensor
- Wiring or connector issues in the sensor circuit
- Damaged reluctor ring or tone wheel
- PCM failure (rare)
2. Symptoms You Will Notice
- Engine misfire or rough running
- Check Engine Light illuminated
- Hard starting or no start condition
- Reduced fuel economy and power
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the crankshaft position sensor and its wiring for damage or corrosion.
Step 3: Test the sensor's resistance and signal output with a multimeter or oscilloscope.
Step 4: Check the reluctor ring for damage or debris.
Step 5: If all else is fine, replace the sensor and clear the code.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine stalling, poor performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a sensor replacement, including parts and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.