When the board breaks down then manually you can switch the gears, but electronically the gear remains in the position it was before the shifter board broke, like for example it stays in Parking position. Then the car realizes that something is wrong and switches the transmission into limp mode and shows fault code P0702 in dash. Within Limp Mode your car only drives with second and reverse gear, switching gear lever causes car to jump.
Since you can only drive with 2nd gear, maximum driving speed is about 60 km/h. Also MIL light will light up in dashboard.
P0702 code ALWAYS occurs in Engine Control Module with Jeep gearbox electrical problems. P0702 is generic fault code stored in Engine Control Unit and it means that transmission has some electrical fault. There can be other faulty electrical items in transmission with code P0702, but broken shifter board is the most common.Best way to know what exactly is broken is to read out transmission and engine fault codes. About Jeep Grand Cherokee diagnostic tool. There is no need to change the whole shifter lever assembly in your Jeep Grand Cherokee. It is enough if you change the faulty transmission shifter electronics board and your car will drive again. We made a new and improved version of the Jeep Grand Cherokee transmission shifter PCB module. Our new board is made to last we removed all the design errors, plated all the PCB pads with gold, removed oxidation problems, used high-quality tin that is also used in military and medicine devices and replaced problematic parts with high quality details. We also made completely new and improved firmware for shifter board, it uses more accurate sensor switching with this update car does not go into limp mode when shifter rod bushings are little worn-out. We changed also problematic back-light with LED-s and added 0.7 second delay to reverse light reverse light does not blink anymore when you switch gear from P to D and will light up only when gear rod stays on R position more than 0.7 seconds. Also we are not using any parts that can heat up too much board stays cool and does not break down due to heating.
VIA-s (trace connection holes on board). Copper, small holes (oxidation problems).
Copper, larger holes, coated with gold (Oxidation problem resolved). Low quality, brittle and crumbly (cracks over time).Highest quality, flexible (will not crack over time). Some high, some low quality. EL-tape and inverter, lifetime ca 4000 hours, light weakens over time, the inverter breaks.
LED, lifetime 50000+ hours, light does not weaken over time. Always blink when you move lever over reverse gear. 0.7 second delay, no blink when you move lever over reverse. Sometimes breaks (engineer forgot to add protection diode).
Changed to more powerful and added protection diode. Major heating, over 100C (common problem why board breaks). Minimal heating, no major heating components. Partial coating (the lacquer is sprayed on the board, but not everywhere, humidity can go beneath the coating).Full coating completely immersed in the varnish twice (humidity cant go beneath the coating). Poor, car can go into limp mode when shifter rod bushings are little worn-out. Good, car does not go into limp mode when shifter rod bushings are worn-out.
After you switch your PCB module, you need to erase ENGINE AND GEARBOX fault codes! We are not reliable for wrong diagnosis put on your car by yourself or someone else. THIS PCB ONLY FITS TO JEEP GRAND CHEROKEE 2.7 CRD DIESEL MODELS! Please note that this is not an OEM part, but fully compatible with your 2.7 CRD WJ Jeep and our board has better quality than OEM shifter board. Changing a PCB takes about 20 min.And we will be happy to advice you in any problems. After changing shifter board, you'll probably need to clear engine and transmission fault codes with DRB III or Bosch KTS diagnostic device or our ELM327 based diagnostic software. Sometimes car will work fine without clearing codes, but mostly you need to clear them. The item "JEEP GRAND CHEROKEE 2.7 CRD GEAR SELECTOR SHIFTER PCB Replaces 52104468" is in sale since Wednesday, July 26, 2017. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Transmission & Drivetrain\Shifters". The seller is "kaido111" and is located in Tallinn. This item can be shipped worldwide.