WHAT DOES SENSE LOSS MEAN

0 compression doesn't make any sense. it could be valves compression Rings or head gasket. I've never heard a cylinder getting 0 compression. I would do another compression test and double check it

The complexity of the electronics on this vehicle , electronic throttle control ,
The throttle actuator control (TAC) module is the control center for the throttle actuator control system. The TAC system is self-diagnosing and provides diagnostic information to the powertrain control module (PCM) through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated voltage to the TAC, as directed by the PCM.
The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average, class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating, for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.

Your best bet is take it where they have the electronic test equipment to check this problem out.

In all the problems you faced the Battery was disconnected and a reset was performed when it was connected back. Next time when it happens check battery voltage and CCA. If battery is low recharge and perform a battery Parasitical drain test. Follow this link to perform Battery Drain Test and also send me the codes you had found on last breakdown:

1. https://www.youtube.com/watch?v=KF1gijj03_0

2. https://www.youtube.com/watch?v=Y0HjaR0tj7Q

Also clean the throttle body. A intermittent malfunction on Cam position Sensor can also cause this problem.

please send me more info about this generator I need a model number is this a natural gas or propane I have a neighbor that just had one installed I might be able to get some info from him to help you

Instead of guessing as to what the problem is or expecting someone on here having a magical fix , take it to a qualified repair shop. Before assuming the worst an wanting to condem the PCM - powertrain control module . Will a scan tool communicate with it ? If your pulling codes it is .
DTC P0603 Control Module Long Term Memory Reset
The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

Have you disconnected the battery ?
Diagnostic Aids
If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

There is no thinking & throwing parts at any vehicle

The only fix is knowledge & the ability to do some testing

Lets go with a failed fuel pump & at least check pressure
at the motor on a gauge or see if that data is on a scan tool

Explain what test told you a cylinder wasn't firing !

the thermostat is staying closed possible or a leak in the system have you checked the lines and water pump or radiator but nothing related to the battery

po 870 refers to transmission fluid pressure- check fluid level of trans while parked with engine running and the jeep level.- if level is ok- might be time to have filter and fluid changed

Sounds like Generator mode switch should be "ON".

These are for 4.9L


P016-generator voltage out of range--Voltage is below 10 volts or above 16 volts with engine at 500rpm.

P030-Idle speed control (ISC) out of range--Check ISC for operation

A047-very low A/C refrigerant condition warning--check refrigerant level

I039-speed sensing suspension (SSS) fault--this one requires a lot of testing. Could be anything from bad connection at a strut, to bad ground, to bad strut.

I041-battery voltage too low--at 800 rpm, voltage is less than 10.6 volts

I052-keep alive memory error--means IPC lost voltage, and reset. Normal if battery was disconnected, or lost voltage.


These codes are for 4.6L


I039-loss of road sensing suspension (RSS) data--might need to replace rss module

P016-generator voltage out of range--same as above.


If you need anything else, let me know.