1 like 0 dislike
373 views
by

Code p1128 with engine light on couple of days engine service light turns off at high speed transmission jerks and light back on and then a couple of days later turns off again

Vehicle: 2008 Dodge Grand Caravan STX 3.8L

2 Answers

0 like 0 dislike
by (8.3k points)
 
Best answer

P1128 DODGE - Closed Loop Fueling Not Achieved Bank 1
Read more: https://www.autocodes.com/p1128_dodge.html

When the engine is cold and is started or there is a malfunction with the engine, the engine operates in “Open Loop” meaning that the Engine Control Module (ECM) will ignore most of the sensors reading and use predefined parameters set by the factory to control the engine, more specifically the engine’s air/fuel mixture. This "Open Loop" operation allows time for the engine to come up to a normal operating temperature before it starts using the information from the sensors to adjust for driving conditions. Once the engine is warm-up or reach normal operating temperature and there are no engine malfunctions, the ECM will start controlling the engine in "Close Loop", meaning that the ECM will receive the signals from the Oxygen Sensor, Coolant Temperature Sensor, and other engine sensors to control the engine's air/fuel mixture.

There are many probable causes for this code to come up, for example, lack of fuel, low fuel pressure, low engine coolant or bad coolant temperature sensor, wiring connection to other sensors, mechanical problems, and problems with the Powertrain Control Module (PCM).

Start by checking the fuel level, coolant level, fuel pressure, oxygen sensors connector, coolant temperature sensor connector, and Mass Air Flow (MAF) sensor and connector.

1 like 0 dislike
by (13.5k points)
Hi there

P1128-CLOSED LOOP FUELING NOT ACHIEVED - BANK 1

This can be caused by several different things. Each has to be tested to determine the issue. Usually, it is best to have a scan tool. One other item would be the thermostat. If the engine isn't getting up to operating temp this code could appear as well.

Related questions

1 like 0 dislike
1 answer 357 views
1 like 0 dislike
2 answers 660 views
1 like 0 dislike
2 answers 738 views
1 like 0 dislike
2 answers 334 views
1 like 0 dislike
2 answers 689 views

36.2k questions

32.2k answers

1.3k comments

22.8k users

Need A Repair Shop?
Find local automotive repair shops in your area.
Does your car have Safety Recalls? → Check here
...