P0375 — Timing Reference High Resolution Signal “B” #

Note: The code description can vary depending on the vehicle manufacturer. Always consult your OEM (Original Equipment Manufacturer) documentation for model-specific terms.

• Timing Reference High Resolution Signal “B” (General/SAE)
• Timing Reference Signal B Circuit Malfunction (GM, Chevrolet, Cadillac)
• Crankshaft Position Sensor B Circuit High Resolution (Toyota, Lexus)
• High Resolution Engine Speed Sensor “B” Signal (Nissan, Infiniti)
• Camshaft Position Sensor B, High Resolution Signal (Chrysler, Dodge, Jeep)

Summary of DTC P0375 #

P0375 is a diagnostic trouble code (DTC) that indicates a malfunction in the high resolution timing reference signal “B” circuit. This code is typically related to the crankshaft or camshaft position sensor circuit, which are critical for accurate engine timing. These sensors deliver high-resolution signals to the engine control module (ECM) or powertrain control module (PCM), allowing precise fuel injection and ignition timing. When the ECM/PCM detects a problem with the “B” signal (which could be a missing, erratic, or out-of-spec signal), it triggers P0375. This code can point to electrical issues, sensor faults, wiring damage, or even internal engine problems.

Common Symptoms for DTC P0375 #

When P0375 is triggered, your vehicle may display one or more noticeable symptoms. Some drivers may experience only mild issues, while others could face significant drivability problems. These symptoms are critical clues for technicians investigating the underlying cause.

• Check Engine Light (CEL) illuminated
• Engine may crank but not start
• Rough idling or engine misfires
• Stalling, especially at low RPMs
• Loss of power or reduced acceleration
• Poor fuel economy
• Hesitation or jerking during acceleration

Likely Causes for DTC P0375 #

The most common reasons for a P0375 code are related to sensor failure, wiring issues, or ECM/PCM problems. Understanding the likely causes can help prioritize your diagnostic approach and avoid unnecessary parts replacement.

1. Faulty high resolution crankshaft or camshaft position sensor “B”
2. Wiring problems (corroded, shorted, or broken wires/connectors in the sensor circuit)
3. Defective or loose sensor connector
4. Damaged reluctor wheel or timing reference trigger wheel (on crankshaft or camshaft)
5. ECM/PCM malfunction (rare, but possible)
6. Improper aftermarket sensor installation
7. Electrical interference from nearby components

Step-by-Step Diagnostic Guide for Code P0375 #

Diagnosing P0375 requires a systematic approach to avoid missed details or misdiagnosis. Follow these steps, and always refer to OEM service information for your specific vehicle.

• Connect a professional OBD-II scan tool and record freeze frame data and any related codes.
• Visually inspect the sensor “B” and wiring harness for signs of damage, corrosion, or loose connectors.
• Check the signal and reference voltage at the sensor using a digital multimeter or oscilloscope.
• Test the resistance of the sensor (compare to OEM specifications).
• Inspect the reluctor or trigger wheel for missing teeth, cracks, or debris.
• Check the ECM/PCM connectors for corrosion or bent pins.
• If all wiring and sensors test good, consider software updates or reprogramming the ECM/PCM per OEM guidance.

Possible Repairs for DTC P0375 #

Once you have identified the root cause, the following repairs may resolve the P0375 code. Always clear the code and perform a test drive to confirm the fix.

• Replace the faulty crankshaft or camshaft position sensor “B”
• Repair or replace damaged wiring or connectors in the sensor circuit
• Clean or replace the reluctor/trigger wheel if damaged or dirty
• Secure any loose connectors or terminals
• Replace or reprogram the ECM/PCM (only after all other options are ruled out)
• Reinstall or replace aftermarket sensors with OEM-quality parts

Is It Safe to Drive with Code P0375? #

Limited: It is generally not recommended to continue driving with a P0375 code. While some vehicles may run with reduced performance, others can stall unexpectedly or fail to start altogether. Engine timing issues can lead to further damage or unsafe driving conditions. Address this code promptly to avoid roadside breakdowns or costly engine repairs.

Vehicles Most Commonly Affected by DTC P0375 #

While P0375 is a generic OBD-II code, some vehicles are more prone due to sensor design or engine configuration. Always check for manufacturer-specific service bulletins.

• GM/Chevrolet/Cadillac trucks and SUVs (late 1990s–2010s)
• Toyota and Lexus V6 and V8 engines (2000s–2010s)
• Nissan and Infiniti models with VQ or VK engines
• Chrysler, Dodge, Jeep models with V6 and V8 engines
• Ford F-Series and Mustang (rare, but possible on certain years)

Common Mistakes & Best Practices for P0375 #

Misdiagnosis is common with timing-related codes. Avoiding these pitfalls will save you time and money—and prevent unnecessary parts swaps.

• Replacing the sensor without checking wiring or connector integrity
• Ignoring related codes or freeze frame data that can provide crucial context
• Overlooking reluctor/trigger wheel condition
• Using generic aftermarket sensors that may not meet OEM specs
• Failing to clear the code and retest after repairs

Express FAQ — P0375 #

Still have questions about P0375? Here are some quick answers:

• Q: Can a weak battery or bad alternator cause P0375?
  A: Low voltage can sometimes cause sensor signal errors, but P0375 typically points to a sensor, wiring, or ECM issue. Always check battery health as part of your diagnostic process.
• Q: Will clearing the code fix the problem?
  A: Clearing the code without addressing the root cause will only reset the warning temporarily. The code and symptoms are likely to return until proper repairs are made.
• Q: Do I need an OEM sensor, or is aftermarket okay?
  A: For critical timing components, OEM parts are strongly recommended to ensure reliability and signal accuracy.