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P0638

Overview

Code

P0638

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 P0638 indicates an issue with 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

Fuel pressure irregularities can impair performance

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