Question about 1999 Chevrolet K1500

1 Answer

Transmission shifting hard

I had problems with my ecm (mouse chewed insulation off some wires) not starting the fuel pump, I bypassed ecm using a relay so my fuel pump comes on with the ignition. Now my transmission shifts extremely hard

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Contributor
  • 20 Answers

Sounds like the mouse chewed more than just your fuel pump wiring. How hard your transmission shifts is controlled by the PCM, controlling the force motor inside the trans. There should be some troublecodes present in the PCM that may help you pinpoint the problem. You can also hook a scanner to your vehicle to see what it is doing.

There could also be internal mechanical or electrical problems with your transmission. A scanner with bi-directional controls can help you determine whether your problem is electrical or mechanical. These transmissions are known to break springs and plastic pistons in the valve body. Also, if your transmission shifts hard in all gears, including shifting into reverse, your sun shell may break. When this happens, you will loose R, 2nd & 4th gears, leaving 1st and 3rd.

As preventive maintenance, installing a shift kit, e.g. SK4L60E from Transgo, and replacing the plastic accumulator pistons with ones made of aluminum may correct your mechanical problems.

Posted on Jul 18, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Car gone in to limp mode had to break hard because of accident to miss car in front is this what can happen when breaking hard

if the sump oil level was low to start with , the hard braking may have caused the oil pump to pump air momentarily and the oil pressure sensor would report and the ECM would place it in limp mode
limp modes are energized by both the engine and the transmission and the transmission TCM unit may have had difficulty in shifting ratios and sio reported it as a fault
run the fault codes and fix what is found or reset the ECM using a scan tool

Aug 08, 2016 | Cars & Trucks

2 Answers

2010 chevy cobalt keeps blowing ECM TRANS fuse

I would look for a loose wire around the fuel pump, something is shorting it out. Sorry I couldnt do better, but thats a start anyway.Good Luck

Apr 14, 2014 | Cars & Trucks

1 Answer

After i have drove for 20 miles or so the transmission shifts hard from first to second ?

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exceptions to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Feb 05, 2013 | 2000 Oldsmobile Bravada

1 Answer

1999 ford windstar speedometer not working keeps blowing fuse to speedometer. Thanks!

Check the wire harnesses on top of the transmission for any signs of open plastic casing. You may of had a mouse or some other critter chew their way through some wire insulation which is causing a short to ground,,,, or a short to power. If any are found, spice wires back together ( same colour wires ) and try speedo again.

Jul 27, 2009 | 1999 Ford Windstar

1 Answer

Ford ranger fuel shutoff switch

i bet its the ecm relay if it starts cutting out then dies then it is the ecm relay i had one that did the same thing if its your fuel relay unplug it clean the terminals and plug it back in if it still does it buy a new one and replace if you bypass it you take a chance of burning the truck too the ground and if ya dont really care about that then find your positive wire in the plug with the key on and hook it too the one that runs your fuel pump so its hard wired

Jul 22, 2009 | 1988 Ford Ranger

1 Answer

Flooding wont start 88 150 302

I had exactly the same problem when I bought a ford pu last year for resale. 4 injector wiring lines were chewed through. I tried starting it before I fixed them, and it ran on the other 4... but it did foul the plugs that had chewed lines, so I changed them & that solved the problem. So if you have the right fuel pressure at the fuel rail, and your injector wiring has been done correctly, i would not buy new injectors until i put new plugs in those cylinders.

Apr 14, 2009 | 1988 Ford F 150

2 Answers

1999 sportage engine is slugish and stalls

try the catalytic converter i had same problem with my 2000 sportage now good as new

Mar 20, 2009 | 1999 Kia Sportage

2 Answers

Fuel pump switch,wiring

A wiring diagram would be usefull. 20df897.jpg
Another way is also to compare with another working same model.

Jun 11, 2008 | 1992 Chevrolet C1500

Not finding what you are looking for?
1999 Chevrolet K1500 Logo

187 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77202 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides