P03C1 — Cylinder 5 Pressure Sensor Circuit Intermittent/Erratic

What Does P03C1 Mean?

P03C1 is a diagnostic trouble code indicating: Cylinder 5 Pressure Sensor Circuit Intermittent/Erratic. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P03C1

⚠️ Check Engine Light (MIL) illuminated
⚠️ Cylinder 5 Pressure Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Engine misfires or rough running

Common Causes

🔍 Loose or intermittent connection at Cylinder 5 Pressure Sensor
🔍 Wire chafing causing intermittent contact
🔍 Cylinder 5 Pressure Sensor failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P03C1 mean?

P03C1 indicates: Cylinder 5 Pressure Sensor Circuit Intermittent/Erratic. The vehicle's computer has detected that the Cylinder 5 Pressure Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P03C1?

Only short distances if absolutely necessary. P03C1 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P03C1?

Repair costs for P03C1 typically range from $30 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 and reseat all Cylinder 5 Pressure Sensor connectors
🔧 Repair chafed or damaged wiring in Cylinder 5 Pressure Sensor circuit
🔧 Replace Cylinder 5 Pressure Sensor if failing intermittently

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.

P03C1: Cylinder 5 Pressure Sensor Circuit Intermittent/Erratic