P0371 — Timing Reference High Resolution Signal A Malfunction
Drive with caution — fix soon.
What P0371 means
This code means the engine computer detected a problem with the high-resolution timing reference signal, a precise input it uses to control ignition and fuel timing. It often points to a faulty crankshaft or camshaft position sensor, damaged wiring, or a problem with the sensor's reluctor ring. It's a moderately common code and is usually fixed by replacing the failing sensor and checking related wiring.
Common symptoms
- Check engine light is on
- Engine stalling or hard starting
- Rough running or hesitation
- Loss of power or surging
- Engine may not start in some cases
Common causes
- Faulty crankshaft or camshaft position sensor
- Damaged or corroded sensor wiring or connector
- Damaged reluctor or timing reference ring
- Interference or electrical noise on the signal circuit
- Faulty engine control module (rare)
Typical repair cost
$150 – $450
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0371 code?
Often yes for short distances, but get it checked soon. The timing signal affects how the engine runs, so you may notice stalling or rough idling. If the engine cuts out or struggles to start, drive carefully and head straight to a shop.
How much does it cost to fix a P0371 code?
Repairs usually run between $150 and $450. A position sensor and labor make up most of the cost. The total can rise if the wiring, connector, or reluctor ring also needs repair, since those take more time to access.
Is a P0371 code serious?
It's moderately serious. The car may still drive, but the faulty timing signal can cause stalling or starting problems that get worse over time. It's best to diagnose and repair it before it leaves you stuck.
What is a high-resolution timing signal?
It's a finely detailed signal, usually from a crankshaft or camshaft sensor, that tells the computer exactly where the engine is in its cycle. The engine uses it to time the spark and fuel precisely, so a fault can make the engine run unevenly.