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P0109

Overview

Code

P0109

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 P0109 indicates an intermittent or erratic signal from the MAP sensor circuit detected by the ECM

Symptoms

Intermittent Check Engine Light; Hesitation or surging; Engine stalling; Rough idle

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

Intermittent MAP sensor signals disrupt engine load calculations and drivability

Possible Causes

Loose or damaged wiring/connectors; Faulty MAP sensor; Vibration-related electrical issues

Diagnostic Steps

1 Scan for intermittent codes; 2 Inspect MAP wiring and connectors; 3 Perform a wiggle test while monitoring live data; 4 Inspect vacuum hoses; 5 Replace the MAP sensor if intermittent faults persist

Drive Safety Notes

Intermittent stalling can pose safety risks Repair is recommended as soon as possible

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