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Edgar, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 48
Experience:  ASE Master technician 25 years in automotive industry 22 years General Motors Technician
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Truck will drive but won't switch gears, It's a 13. No, It's

Customer Question

Truck will drive but won't switch gears
JA: How old is the transmission? Have you checked the brake switch?
Customer: It's a 13. No
JA: What is the model of your '13 Chevy?
Customer: It's 3500 Sierra GMC
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: No
JA: Anything else you think the mechanic should know?
Customer: Brake light is on and abs also
Submitted: 1 year ago.
Category: Transmissions
Expert:  Edgar replied 1 year ago.
Hello my name is ***** ***** I'll be happy to assist you today, have you checked for any diagnostic trouble codes? When you mention that doesn't switch gears it means it does not shift at all? Is the vehicle diesel fuel or gasoline?
Customer: replied 1 year ago.
No. It will only go in 1st or R. Diesel
Expert:  Edgar replied 1 year ago.
That transmission has two speed sensors one is the turbine speed sensor and the other one is the vehicle speed sensor, they are outside mount in the case, check the connection at the sensors and the transmission control module should set a dtc you may want to check for dtc, also does the shift indicators in the instrument cluster is flashing when you shift the transmission?

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