P1129 Dodge Code - Closed Loop Fueling Not Achieved Bank 2
Quick Answer
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. Common causes include Fuel delivery system, Engine Coolant Temperature (ECT) sensor or wiring connectors, MAP sensor or wiring connectors. 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
- P1129 Dodge indicates Closed Loop Fueling Not Achieved Bank 2.
- Common causes
- Common causes include Fuel delivery system, Engine Coolant Temperature (ECT) sensor or wiring connectors, MAP sensor or wiring connectors.
- 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.
Code P1129 Dodge Description
What are the Possible Causes of the DTC P1129 Dodge?
- Fuel delivery system
- Engine Coolant Temperature (ECT) sensor or wiring connectors
- MAP sensor or wiring connectors
- O2 sensor wiring or connectors
- Engine mechanical system
How to Fix the DTC P1129 Dodge?
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 P1129 Dodge 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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Frequently Asked Questions about P1129 Dodge Code
1. What are the common symptoms of OBDII code P1129 in a Dodge related to closed loop fueling not achieved on Bank 2?
- Common symptoms include decreased fuel efficiency, rough idling, and potential engine misfires.
2. What are the possible causes of OBDII code P1129 in a Dodge indicating closed loop fueling not achieved on Bank 2?
- Potential causes may include a faulty oxygen sensor, a vacuum leak, clogged fuel injectors, or a malfunctioning mass airflow sensor.
3. How does a faulty oxygen sensor contribute to triggering OBDII code P1129 in a Dodge?
- A faulty oxygen sensor can provide inaccurate readings to the engine control module, leading to improper fuel-air mixture adjustments and the failure to achieve closed loop fueling on Bank 2.
4. What repair tips can help address OBDII code P1129 in a Dodge related to closed loop fueling not achieved on Bank 2?
- It is recommended to inspect and replace any faulty oxygen sensors, check for vacuum leaks, clean or replace clogged fuel injectors, and ensure proper functioning of the mass airflow sensor.
5. Can a dirty or clogged air filter contribute to triggering OBDII code P1129 in a Dodge?
- Yes, a dirty or clogged air filter can disrupt the airflow into the engine, affecting the fuel-air mixture ratio and potentially causing the engine to run rich, leading to the failure to achieve closed loop fueling on Bank 2.
6. Is it safe to continue driving a Dodge with OBDII code P1129 indicating closed loop fueling not achieved on Bank 2?
- It is not recommended to ignore this code, as it can lead to decreased fuel efficiency, potential engine damage, and increased emissions. It is advised to address the underlying issue promptly.
7. How can a professional mechanic diagnose OBDII code P1129 in a Dodge accurately?
- A professional mechanic can use a diagnostic scanner to read the code, perform a visual inspection for any obvious issues, conduct tests on sensors and components, and analyze live data to pinpoint the root cause.
8. Are there any DIY methods to troubleshoot OBDII code P1129 in a Dodge before seeking professional help?
- DIY methods include checking for visible signs of damage, inspecting sensor connections, cleaning the mass airflow sensor, and ensuring the air filter is clean and not clogged.
9. Can a failing fuel pump contribute to triggering OBDII code P1129 in a Dodge?
- Yes, a failing fuel pump can lead to inadequate fuel delivery, affecting the fuel-air mixture ratio and potentially causing the engine to run rich, leading to the failure to achieve closed loop fueling on Bank 2.
10. How important is it to address OBDII code P1129 promptly in a Dodge to ensure optimal engine performance?
- It is crucial to address this code promptly to prevent potential engine damage, ensure optimal fuel efficiency, reduce emissions, and restore proper engine performance.
Discuss the causes and fixes for P1129 Dodge OBDII Code
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Change the 02 sensor. And crankshaft position sensor also. How to remove the code..in The PCM.
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What model and year is your Dodge? The O2 sensor is one of the possible cause, but not the crankshaft position sensor. Did you use a factory O2 sensor?
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The engine code P1129 on a 2010 Ram 1500 5.7 Laramie generally indicates an issue with the fuel/air mixture, often related to an O2 sensor or air/fuel metering problem. After replacing the O2 sensor and crankshaft position sensor, you can clear the code from the PCM as follows:
Steps to Clear the Code from the PCM
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Use an OBDII Scanner:
- Plug an OBDII scanner into the diagnostic port under the dashboard.
- Turn the ignition key to the "ON" position (do not start the engine).
- On the scanner, select the option to "Read Codes" to confirm P1129 is active, then choose "Clear Codes" or "Erase Codes."
- After clearing, turn off the ignition, wait a few seconds, and start the vehicle to check if the code has reset.
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Disconnect the Battery (Alternative Method):
- Disconnect the negative battery terminal and leave it disconnected for about 15 minutes to drain any remaining power from the PCM.
- Reconnect the battery and start the vehicle. This may reset the PCM and clear any stored codes. However, you may need to reprogram your radio and other settings.
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Drive Cycle to Reset the PCM:
- After clearing the code, you might need to drive the vehicle to allow the PCM to run a full diagnostic cycle and verify the sensors are operating correctly. Try driving at various speeds to help reset all monitors.
Important Notes
- Persistent Code: If P1129 returns, it could mean there are additional issues with the air intake, vacuum leaks, fuel system, or sensors.
- PCM Adaptation: Sometimes the PCM needs to relearn after parts replacement, so a few miles of driving may help stabilize the readings.
Clearing the code through these steps should reset the PCM and verify that your replacement of the O2 sensor and crankshaft position sensor has addressed the issue.
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I have been fighting this problem with my dodge 2008 Ram 1500 v6 . Code appear p1128, p1129, p0300, p132 in an endless loop and no matter what we change or do we fix one another one appears. All sensors have been changed. fuel injectors cleaned and calibrated, air intake checked , fuel pressure checked, all ground connections checked and cleaned etc..........4 separate mechanics, including CHRYSLER service center and still no solution.
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thats my problem 20 year tech can't find it all sencors changed map and heat sencor coils fuel regalator at the end!
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