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sprinkles08
sprinkles08, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 21589
Experience:  Chrysler/Dodge/Jeep master tech ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans Specialist
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NO CODES ARE COMING UP ON MY 2008 JEEP LAREDO, TRANS MISSION

Customer Question

NO CODES ARE COMING UP ON MY 2008 JEEP LAREDO, TRANS MISSION WILL SHIFT UP TO 3RD GEAR AND NO MORE ,IS THE ECM BAD, NEEDS CLEANED, THERES NO CLUNKING OR JERKING, NO GRINDING, SHIFTS FINE FIRST 3 GEARS.
Submitted: 1 year ago via CarComplaints.com.
Category: Transmissions
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!
It's possible that the PCM has failed. It isn't that likely but if it isn't shifting into fourth and fifth with no codes setting then it's definitely possible that the PCM is the issue.
A mechanical or clutch failure in the trans can cause it not not shift into fourth and fifth but any issue in the trans should set a fault code and turn the engine light on, locking you in third gear only. This doesn't seem to be what you're having.
The engine light isn't coming on?
You've used a scan tool to enter the TCM and no codes are found?
Customer: replied 1 year ago.
No codes, no engine lite on, was plugged into a handheld computer, no codes. What is a PCM?
Expert:  sprinkles08 replied 1 year ago.
The PCM is the powertrain control module.
Does the problem happen every time you drive the vehicle?
Customer: replied 1 year ago.
Yes every time but not driving it don't want to further damage it.
Expert:  sprinkles08 replied 1 year ago.
You're aware that you have autostick and if the shifter is bumped to the left slightly it will limit your highest gear?
Customer: replied 1 year ago.
I'm aware, tried slap stick will only shift to 3 rd.
Expert:  sprinkles08 replied 1 year ago.
When this is happening and you bump the stick repeatedly to the right it won't display higher than third gear?
Customer: replied 1 year ago.
It will display 1st through 5th just won't shift to 4th or 5th. Rpm's will start to climb on top end of 3rd but will not shift into 4 th. Or 5 th
Expert:  sprinkles08 replied 1 year ago.
What are your cruising RPM's at 65 MPH?

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