3X Reference Circuit
Table of contents
P1374 BUICK Possible Causes
- Faulty Crankshaft Position (CKP) Sensor
- Crankshaft Position (CKP) Sensor harness is open or shorted
- Crankshaft Position (CKP) Sensor circuit poor electrical connection
- Faulty Ignition Control Module
How do I fix code P1374 BUICK?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1374 BUICK code
The cost of diagnosing the P1374 BUICK code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1374 BUICK Description
The 3X reference signal is produced by the Ignition Control Module (ICM). The ICM calculates the 3X reference signal by piding the Crankshaft Position (CKP) sensor 18X pulses by 3. This calculation is performed while the engine is running, and while the CKP sync pulses are being received. The Powertrain Control Module (PCM) uses the following information:
– The 3X reference signal in order to calculate the engine RPM, and the CKP at engine speeds above 1,200 RPM
– The pulses on the circuit in order to initiate injector pulses
– A constant monitoring of the number of pulses on the 3X reference circuit
– A comparison to the number of 3X reference pulses to the number of 18 X reference pulses and CAM signal pulses being received