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P1128 Jeep Code - Closed Loop Fueling Not Achieved Bank 1

- Code Popularity: 55,819 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1128 Jeep?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Fuel delivery system
  • Manifold Absolute Pressure (MAP) sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system
  • Faulty Powertrain Control Module (PCM)
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How to Fix the DTC P1128 Jeep?

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1128 Jeep code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1128 Jeep Description

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated amount of time, when conditions would have otherwise closed loop operation.

OBDII Code P1128 Jeep - Closed Loop Fueling Not Achieved Bank 1 - AutoCodes.com
P1128 Jeep Code - Closed Loop Fueling Not Achieved Bank 1

Need More Information on the Code?

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Code P1128 Jeep comments

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