P0375 — Timing Reference High Resolution Signal A No Pulses
Drivable short-term, but fix now to avoid damage.
What P0375 means
This code means the engine control module is receiving no signal at all from the 'A' high-resolution timing reference sensor. It's usually caused by a completely failed sensor, a broken or disconnected wire, or a severely damaged reluctor ring. Because this signal is essential for timing, the car often won't run properly or start, but the repair itself is usually a sensor or wiring fix rather than major engine work.
Common symptoms
- Check engine light is on
- Engine cranks but won't start
- Engine stalls and won't restart
- No tachometer reading while cranking
- Sudden loss of power
Common causes
- Completely failed position/timing sensor
- Broken, disconnected, or shorted wiring
- Open or corroded sensor connector
- Severely damaged or sheared reluctor ring
- Faulty engine control module (rare)
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0375 code?
Not reliably. With no timing pulses, the engine may stall or refuse to start at any time. It's best to have it towed or repaired before relying on the vehicle.
How much does it cost to fix a P0375 code?
Most repairs land between $150 and $500. A sensor swap is on the lower end, while wiring repairs or reluctor ring damage cost more.
Is a P0375 code serious?
Yes, it's serious. A missing timing signal can leave you with a no-start or a vehicle that stalls without warning, so it should be fixed right away.
Why won't my car start with a P0375 code?
The computer needs the high-resolution timing pulse to fire spark and fuel at the right moment. With no pulses, it can't time the engine, so it often won't start or stay running.