Faulty high-resolution timing sensor (camshaft or crankshaft position sensor) for signal 'B'; Damaged or corroded wiring or connector at the sensor or ECM; Worn or damaged reluctor wheel or timing ring that generates the signal; Electrical interference or poor ground connection affecting the signal; ECM software issue or internal fault (less common); Mechanical timing chain or belt wear causing signal misalignment

DTC codes / P03xx · Ignition system and misfire / P0375

P0375Timing Reference High Resolution Signal 'B'

Q: What does code P0375 mean?

Timing Reference High Resolution Signal 'B'. P0375 indicates that the engine control module (ECM) has detected a problem with the high-resolution timing reference signal 'B' from the camshaft or crankshaft position sensor circuit. This signal is used to precisely synchronize fuel injection and ignition timing, and when it is missing, erratic, or out of phase, the ECM sets this code and may default to a less accurate timing strategy.

P0375 indicates that the engine control module (ECM) has detected a problem with the high-resolution timing reference signal 'B' from the camshaft or crankshaft position sensor circuit. This signal is used to precisely synchronize fuel injection and ignition timing, and when it is missing, erratic, or out of phase, the ECM sets this code and may default to a less accurate timing strategy.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Engine may run rough or misfire, especially under load or at idle
Difficulty starting or extended cranking time
Reduced engine power or limp mode activation
Poor fuel economy or increased emissions
In rare cases, engine stall or hesitation during acceleration

Common causes, most likely first

Faulty high-resolution timing sensor (camshaft or crankshaft position sensor) for signal 'B'
Damaged or corroded wiring or connector at the sensor or ECM
Worn or damaged reluctor wheel or timing ring that generates the signal
Electrical interference or poor ground connection affecting the signal
ECM software issue or internal fault (less common)
Mechanical timing chain or belt wear causing signal misalignment

How to diagnose and fix it

Use an OBD-II scanner to verify P0375 and check for related codes; record freeze-frame data
Inspect the sensor and its wiring for visible damage, corrosion, or loose connections
Perform a resistance and voltage check on the sensor circuit according to the manufacturer's specifications
Check the reluctor wheel or timing ring for cracks, missing teeth, or debris
Compare the high-resolution signal 'B' with signal 'A' using an oscilloscope to detect irregular waveforms
If the sensor is faulty, replace it and clear the codes; test-drive to confirm the repair
If the wiring or ECM is suspect, perform pinpoint tests and repair or replace as needed

Signal B faults often misdiagnosed as sensor failure

A common mistake is replacing the sensor without checking the reluctor wheel or timing ring, which can be damaged or misaligned and cause the same code.
Electrical interference from aftermarket accessories or poor grounds can corrupt the high-resolution signal, leading to P0375 even when the sensor tests good.
The code can be set by a mechanical issue such as a stretched timing chain, so always verify base engine timing before condemning electrical components.
On some vehicles, a weak battery or charging system fault can cause erratic sensor signals and set this code, so check system voltage first.
P0375 may be accompanied by other timing-related codes; diagnosing them together often reveals a shared root cause like a wiring harness chafe.

Can I keep driving with P0375?

If the engine runs normally and only the check engine light is on, you can drive cautiously to a repair shop, but avoid heavy acceleration or towing. If the engine runs rough, misfires, or stalls, stop driving and have the vehicle towed to prevent further damage or safety risk.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.