What does Jeep fault code 14 mean?

Q: What does Jeep fault code 14 mean?

14 indicates: Rough idle; Engine "running rich" (smell of unburned gas); Poor throttle response. Fix: MAP Sensor Voltage Too High/Low. LOGIC: The Manifold Absolute Pressure sensor signal is outside the expected 0.5V - 4.5V range. ACTION: 1. Check the vacuum line between the throttle body and the MAP sensor. 2. Verify 5V reference at the sensor. FIX: Replace the MAP Sensor or repair the cracked vacuum line.

Jeep Fault Code

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14

Rough idle; Engine "running rich" (smell of unburned gas); Poor throttle response.

System

Not specified

Symptom

Rough idle; Engine "running rich" (smell of unburned gas); Poor throttle response.

Diagnosis & fix steps

MAP Sensor Voltage Too High/Low. LOGIC: The Manifold Absolute Pressure sensor signal is outside the expected 0.5V - 4.5V range. ACTION: 1. Check the vacuum line between the throttle body and the MAP sensor. 2. Verify 5V reference at the sensor. FIX: Replace the MAP Sensor or repair the cracked vacuum line.

Red Seal field insights

The plastic vacuum tube leading to the MAP sensor becomes brittle with age. Often, the sensor is fine, but the tube has a hairline crack or has "elbowed" off the intake.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

This is general reference information, not a repair manual. It is for trained, qualified technicians.
Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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