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P0091

Overview

Code

P0091

Code Type

P

Code Class

P0

System

Engine

Severity Level

High

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0091 indicates low input in the fuel pressure regulator control circuit

Symptoms

Engine stalls

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Fuel pressure regulation

Possible Causes

Wiring short to ground

Diagnostic Steps

1 Measure control voltage; 2 Inspect harness

Drive Safety Notes

Fuel pressure may drop unexpectedly

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