P1377 — IC Module CAM Pulse To 4X Reference Pulse Comparison

What Does P1377 Mean?

P1377 is a manufacturer-specific diagnostic trouble code: IC Module CAM Pulse To 4X Reference Pulse Comparison. This code applies to BUICK, CADILLAC, CHEVY, CHRYSLER, GM vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1377

⚠️ Check Engine Light (MIL) illuminated
⚠️ IC Module CAM Pulse To 4X Reference Pulse Comparison not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty IC Module CAM Pulse To 4X Reference Pulse Comparison
🔍 Wiring or connector issue in IC Module CAM Pulse To 4X Reference Pulse Comparison circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1377 mean?

P1377 indicates: IC Module CAM Pulse To 4X Reference Pulse Comparison. The vehicle's computer has detected that the IC Module CAM Pulse To 4X Reference Pulse Comparison is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1377?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1377 for extended periods may cause additional problems.

How much does it cost to fix P1377?

Repair costs for P1377 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect IC Module CAM Pulse To 4X Reference Pulse Comparison and related wiring
🔧 Replace faulty IC Module CAM Pulse To 4X Reference Pulse Comparison

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1377: IC Module CAM Pulse To 4X Reference Pulse Comparison