P2D91: Engine Oil Pressure Sensor/Switch C Circuit Range/Performance

Severity

Medium

System

Vehicle Systems

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 P2D91 Mean?

P2D91 is a diagnostic trouble code indicating: Engine Oil Pressure Sensor/Switch C Circuit Range/Performance. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2D91

⚠️ Check Engine Light (MIL) illuminated
⚠️ Engine Oil Pressure Sensor/Switch C not operating within expected parameters
⚠️ Reduced efficiency or performance of related system
⚠️ System warning light illuminated

Common Causes

🔍 Engine Oil Pressure Sensor/Switch C degraded or contaminated
🔍 Mechanical wear or binding in Engine Oil Pressure Sensor/Switch C
🔍 Incorrect Engine Oil Pressure Sensor/Switch C installed (wrong part number)
🔍 Related system mechanical issue affecting Engine Oil Pressure Sensor/Switch C readings

Frequently Asked Questions

What does P2D91 mean?

P2D91 indicates: Engine Oil Pressure Sensor/Switch C Circuit Range/Performance. The vehicle's computer has detected that the Engine Oil Pressure Sensor/Switch C is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P2D91?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2D91 for extended periods may cause additional problems.

How much does it cost to fix P2D91?

Repair costs for P2D91 typically range from $50 to $250, 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 clean Engine Oil Pressure Sensor/Switch C
🔧 Replace degraded Engine Oil Pressure Sensor/Switch C
🔧 Check for related mechanical issues affecting readings

1
Find your vehicle above
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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.