What Does P1374 Mean?
The ECM detected that ignition coil for cylinder 4 was activated earlier than expected timing, possibly related to crankshaft position sensor signal. This indicates a coil driver circuit issue or timing synchronization problem.
Common Causes
30%
Crankshaft position sensor signal error or intermittent fault
30%
ECM internal coil driver circuit malfunction
20%
Short to voltage in ignition coil primary wiring
15%
Faulty ignition coil with internal short
5%
Damaged reluctor ring or timing wheel
Diagnostic Steps
1
Step 1: Monitor crankshaft position sensor signal with oscilloscope for glitches or dropouts
2
Step 2: Check ignition coil cylinder 4 primary circuit wiring for shorts to voltage or damage
3
Step 3: Monitor coil trigger signal timing relative to crankshaft position sensor
4
Step 4: Swap cylinder 4 coil with another cylinder to see if code follows coil
5
Step 5: Inspect reluctor ring for damage, missing teeth, or excessive runout
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ECM detected that ignition coil for cylinder 4 was activated earlier than expected timing, possibly related to crankshaft position sensor signal. This indicates a coil driver circuit issue or timing synchronization problem.
The most common cause of P1374 (Crankshaft Position (CKP)/Ignition Coil - Cylinder 4 - Early Activation Fault) is: Crankshaft position sensor signal error or intermittent fault
Typical repair costs for P1374 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause misfire, rough running, or potential engine damage from mistimed ignition. Should be diagnosed and repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1374 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System / Engine Timing Control
Difficulty
Type
Manufacturer
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