P0379 Crankshaft high-resolution signal: no pulses ("B")

By: Diagno editorial team · Updated: 2026-10-15

P0379 means: Crankshaft high-resolution signal: no pulses ("B"). The crankshaft or camshaft sensor tells the computer engine speed and piston position. Don't drive until the car has been checked. The engine could be damaged. The repair usually costs about €60–350 in Estonia. The most common cause: faulty sensor.

What it means

The crankshaft or camshaft sensor tells the computer engine speed and piston position. Without this signal it doesn't know when to fire the spark and fuel.

What you may notice

• No start or hard starting
• The engine cuts out while driving
• Rev counter jumps
• Engine light on

What could be wrong

1. 1Faulty sensor
2. 2Sensor connector or wire (oil or heat damage)
3. 3Damaged reluctor wheel
4. 4Chain or belt jumped

Repair difficulty: Moderate

What you can check yourself

Check whether the sensor connector is oily or loose. If the engine cuts out while driving, don't drive until it's checked. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

1. We read the sensor on the diagnostic tool and compare it with other sensors
2. We check the connector, supply and ground
3. We repair the wiring or replace the sensor

Standard SAE description: Timing Reference High Resolution Signal B No Pulses