AutoCodes – Jeep – P1222 Jeep

P1222 Jeep Code - Leak Detection During Motoring

Quick Answer

When the engine is motoring (i.e. Common causes include Reprogram Engine Control Module (ECM), Faulty Fuel Injector, Fuel Injector harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1222 Jeep indicates Leak Detection During Motoring.
Common causes: Common causes include Reprogram Engine Control Module (ECM), Faulty Fuel Injector, Fuel Injector harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,750

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 11, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1222 Jeep Description

When the engine is motoring (i.e. Engine is running but requires no fuel injection) the only required fuel delivery to the rail is due to natural leakage in the system. The natural leakage depends directly on the rail pressure. A definite amount of fuel is required to overcome the natural leakage, for different fuel pressures. The Engine Control Module (ECM) sets Leakage Detected when the fuel flow exceeds an expected value. When a leak is detected in the system, a counter is initiated. When the counter reaches a predetermined value, a fault is set and engine derate is enabled. When the leak is not detected the counter counts down, and once the counter becomes zero the engine is set back to normal running conditions. The Diagnostic Trouble Code (DTC) will set when the counter reaches a calibrated value.

OBDII Code P1222 Jeep - Leak Detection During Motoring - AutoCodes.com — P1222 Jeep Code - Leak Detection During Motoring

What does this mean?

What are the Possible Causes of the DTC P1222 Jeep?

Reprogram Engine Control Module (ECM)
Faulty Fuel Injector
Fuel Injector harness is open or shorted
Fuel Injector circuit poor electrical connection

How to Fix the DTC P1222 Jeep?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1222 Jeep code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.