Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.
One common issue I have run across several times before is a restriction with one of the exhaust components.I have seen restricted catalytic converters as well as resonators or if this model uses a DPF this can restrict and cause this issue.If you have not had the exhaust checked/tested at all this should be done to see if a restriction is found.If a fault is found with a restriction with one of the exhaust components the restricted component needs replaced.
The other issue can be the fuel injection pump acting up intermittently.I have seen some fail or act up when deceling it wont produce the correct pressure intermittently when trying to accelerate again.If the exhaust tests o.k. I would have the fuel injection pump tested to see if it is faulty needing replaced or repaired at all.
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If this model uses the electronic accelerator position sensor on the gas pedal (electronic gas pedal with no cable attached) the sensor on the pedal may be acting up needing replaced.I have seen this fail before several times needing replaced to correct this type of fault.It is a potentiometer and a certain section in this sensor may have a dead or weak spot causing loss of signal which will cause loss of acceleration like this here intermittently.If this has not been checked this should be done.This will cause this type of fault here.
It is possible still that the injection pump isnt pressurizing the fuel properly when trying to accelerate again after a slow down or stop.I have seen some of the pumps fail like this before needing replaced or repaired.If the fuel system was not tested this needs done to see if this is the cause here.
My info doesn't list the procedure on how this is tested but most of the time the actual and desired fuel rail pressure signal can be checked with a compatible scan tool plugged into your vehicle to check pressures but in most cases the pump needs removed and tested by a diesel repair facility that has the tools and test equipment to test the pump itself.
The tech is correct,if you are able to turn off the key then turn it back on and the problem resets itself or goes away this usually indicates one of the components with the engine or transmission is causing the limp mode here.it is difficult to say for sure from here which component for sure is causing this fault.
One big issue on the diesel engines I have seen is when the engine computer sees a lack of fuel or fuel rail pressure difference between actual pressure and commanded pressure this can cause this and can be a fault with the fuel filter being restricted,an injector leaking or a fault with the injection pump.I have also seen issues with transmission shift or pressure regulating solenoids acting up causing the limp mode as well as sensors like speed sensors in the transmission.
There are several components that will cause the limp mode here and what will have to be done since no codes are setting (if you havent had the fault codes checked yet this should be done to see if any codes are setting as this will help diagnose and locate the fault here) is to operate the vehicle with a scan tool/computer connected to it to monitor data from sensors and solenoids to see if you can catch what is reading out of specification or acting up when the fault occurs.Then it can be further diagnosed or checked into to pinpoint and repair this fault.