P1156 — Manifold Absolute Pressure Sensor Circuit Open/Short To Ground

What Does P1156 Mean?

P1156 is a manufacturer-specific diagnostic trouble code: Manifold Absolute Pressure Sensor Circuit Open/Short To Ground. This code applies to VOLKSWAGEN, BMW, BUICK, CADILLAC, CHEVY 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 P1156

⚠️ Check Engine Light (MIL) illuminated
⚠️ No signal from Manifold Absolute Pressure Sensor
⚠️ Related system defaulting to backup values
⚠️ Reduced engine performance

Common Causes

🔍 Broken wire in Manifold Absolute Pressure Sensor circuit
🔍 Disconnected Manifold Absolute Pressure Sensor electrical connector
🔍 Manifold Absolute Pressure Sensor internal open circuit failure
🔍 Corroded terminal pins preventing electrical contact

Frequently Asked Questions

What does P1156 mean?

P1156 indicates: Manifold Absolute Pressure Sensor Circuit Open/Short To Ground. The vehicle's computer has detected that the Manifold Absolute Pressure Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1156?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1156 for extended periods may cause additional problems.

How much does it cost to fix P1156?

Repair costs for P1156 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

🔧 Locate and repair broken wire in Manifold Absolute Pressure Sensor circuit
🔧 Replace damaged Manifold Absolute Pressure Sensor connector
🔧 Replace Manifold Absolute Pressure Sensor if internally open

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.

P1156: Manifold Absolute Pressure Sensor Circuit Open/Short To Ground