P1161: Manifold Temperature Sensor Circuit Open/Short To B+

VOLKSWAGEN BUICK CADILLAC CHEVY CHRYSLER GM GMC OLDSMOBILE

Severity

Medium

System

Manufacturer-Specific Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P1161 Mean?

P1161 is a manufacturer-specific diagnostic trouble code: Manifold Temperature Sensor Circuit Open/Short To B+. This code applies to VOLKSWAGEN, BUICK, CADILLAC, CHEVY, CHRYSLER 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 P1161

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

Common Causes

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

Frequently Asked Questions

What does P1161 mean?

P1161 indicates: Manifold Temperature Sensor Circuit Open/Short To B+. The vehicle's computer has detected that the Manifold Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1161?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1161 for extended periods may cause additional problems.

How much does it cost to fix P1161?

Repair costs for P1161 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 Temperature Sensor circuit
🔧 Replace damaged Manifold Temperature Sensor connector
🔧 Replace Manifold Temperature Sensor if internally open

1
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.