OBD-II Code
P0375
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$200–$1,400
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0375 means the secondary high-resolution timing reference signal (Signal B input to the ECM/PCM) is malfunctioning in a way the controller can't otherwise classify as 'erratic' or 'no pulses' — typically a correlation failure between CKP-A and CKP-B, or a signal that's electrically present but doesn't match the expected pattern (wrong pulse count per revolution, phase offset, or amplitude).
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP0375 means the secondary high-resolution timing reference signal (Signal B input to the ECM/PCM) is malfunctioning in a way the controller can't oth…
P0375 means the secondary high-resolution timing reference signal (Signal B input to the ECM/PCM) is malfunctioning in a way the controller can't otherwise classify as 'erratic' or 'no pulses' — typically a correlation failure between CKP-A and CKP-B, or a signal that's electrically present but doesn't match the expected pattern (wrong pulse count per revolution, phase offset, or amplitude).
Cheapest-first ladder
- scan-tool both crank-position inputs simultaneously and look for the cam-to-crank correlation reading — a healthy system shows correlation within +/- 2 degrees crank; anything beyond that is mechanical (stretched chain, slipped reluctor) rather than electrical.
- Scope CKP-A and CKP-B on a two-channel scope and verify the expected pulse-per-revolution count — missing-tooth detection on most domestic diesels is 58-of-60 teeth (two missing as the synchronization gap), while some VAG TDI applications use 35-of-36; a wheel that suddenly shows 56-of-60 has a chipped tooth.
- Verify the air gap on the secondary sensor — 0.5 to 1.5 mm is typical; a sensor that's backed out 2 mm by a missing shim reads weak amplitude and triggers P0375.
- Check for shared-ground faults — many engines route CKP-A and CKP-B grounds to the same PCM pin, and a poor ground there shifts the B signal threshold without affecting A. Expensive-misdiagnosis caveat: before you replace the CKP-B sensor, scope it AGAINST CKP-A — if A and B are both clean individually but the phase offset is wrong, the timing chain has stretched and the reluctor on the cam-end of the engine has slipped relative to the crank-end; a new sensor changes nothing and you need a timing-chain service.
Vehicle-specific patterns2008-2010 Ford 6.4L Powerstroke commonly throws P0375 from a known CKP-B sensor failure where the sensor's internal Hall element loses linearity at t…
- 2008-2010Ford 6.4L Powerstroke commonly throws P0375 from a known CKP-B sensor failure where the sensor's internal Hall element loses linearity at temperature — the truck starts cold and runs fine until oil temp climbs past 200 F, then sets the code and goes into reduced power.
- 2011-2016GM Duramax LML throws P0375 when the camshaft reluctor on the rear of the camshaft loses its press-fit and rotates a few degrees; symptoms include hard hot-start and intermittent stall.
- 2007-2010Mercedes OM642 (Sprinter, ML320 BlueTec) throws P0375 from a TSB-documented harness routing issue where the CKP-B pigtail rubs the bell-housing flange.
- 2008-2013BMW N57 inline-6 diesel throws P0375 from a failing Bosch CKP that goes intermittent above 3,500 rpm only.
Estimated repair$200 to $1,400.
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