top of page

P0646

Overview

Code

P0646

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0646 indicates a malfunction in the fuel pressure sensor circuit

Symptoms

Poor fuel economy; Engine misfire

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 sensor

Possible Causes

Faulty fuel pressure sensor; Wiring issues

Diagnostic Steps

1 Inspect fuel pressure sensor 2 Test sensor output

Drive Safety Notes

Inconsistent fuel pressure may impair vehicle performance

bottom of page