P0375
Timing Reference High Resolution Signal B
Ignition / timing reference
Generic OBD-II
High
What it means
P0375 means the engine computer has detected a problem with the 'B' high-resolution timing-reference signal — the fine-grained crank/cam signal it uses to time spark and fuel precisely. A fault here can cause misfires, hard starting, or stalling, and usually traces to the sensor, its wiring, or the timing wheel.
High
Can I keep driving? Risky — the ECM uses this timing-reference signal for spark and fuel timing, so a fault can cause misfires, stalling, or a no-start. Repair before relying on the vehicle.
Common symptoms
What you'll notice
- Check-engine light on
- Engine misfires or runs erratically
- Hard starting or stalling
- Reduced power and poor fuel economy
Common causes
Most likely first
- Faulty crankshaft/camshaft timing-reference sensorLikely
- Damaged wiring or a poor connector in the signal circuitCommon
- Damaged reluctor/timing wheel or incorrect sensor air gapCommon
- Worn or jumped timing chain/belt affecting the reference signalLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the sensor connector and wiring for damage or corrosion.
- Check the sensor air gap, mounting, and the reluctor wheel for damage or debris.
- Test the timing-reference signal with a scope or meter while cranking.
- If the signal is intermittent under load, verify timing-chain/belt condition. Replace the sensor if confirmed, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0375?+
Not really — a dropout in the timing-reference signal can cause a sudden misfire or stall. Address it promptly.
Can I just clear P0375?+
You can, but if the signal is genuinely faulty the code returns and driveability problems continue until it's fixed.
Related codes
Often seen with P0375
Read & clear P0375 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX