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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4394
Experience:  Owner at DJ Wilson
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2008 Kenworth T800 automatic transmission, get red service

Customer Question

2008 Kenworth T800 automatic transmission, get red service light and f6 code on trans mission console, engine derates.
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Customer: replied 11 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Daniel Wilson replied 11 months ago.

Hi my name is***** will be glad to try to help. What are you getting for fault codes and what is the engine model and transmission model numbers from the ID tags?

Customer: replied 11 months ago.
CAT C-15 ENGING, TRANS EATON ULTRASHIFT
Expert:  Daniel Wilson replied 11 months ago.

Thanks for the info. Click on this link for the complete troubleshooting manual.

Troubleshooting

Expert:  Daniel Wilson replied 11 months ago.

Pull your transmission codes using the procedures in the manual. Also check the engine fault codes and let me know if you have an engine light on indicating active codes.

Customer: replied 11 months ago.
I Dont have a manual, how do i pull the transmission code, onboard diagnosis does not show any engine fault codes and no engine lights
Expert:  Daniel Wilson replied 11 months ago.

Click on the troubleshooting link I posted. I uploaded the manual.

Customer: replied 11 months ago.
5-3-7
75
Expert:  Daniel Wilson replied 11 months ago.

Thanks for the info. Fault 75 is Power down in gear caused from improper shutdown

. See PDF page 371 in the manual I posted. The other numbers I am not sure where you got them as the fault codes should be two digit numbers. Click here for a quick reference. Fault guide

This code will only be set inactive

Overview

This fault is detected when the vehicle is powered down in any gear position other than neutral.

Detection

The Transmission ECU monitors shift device positi

on and electric shifter position during vehicle

shut down. If a non-neutral shift device position and in gear position are detected during vehicle

shut down, this code will be set.

Fallback

No Fallback Mode. This is a non driving power down fault, it may cause a “-” dash during power up

if the transmission is torque locked after shutting down in gear.

Required Tools

• ServiceRanger a PC-based Service Tool

• Troubleshooting Guide

• Driver Instruction Book

Possible Causes

This fault code can be caused by any of the following

Note:

This code will only be set inactive

Overview

This fault is detected when the vehicle is powered down in any gear position other than neutral.

Detection

The Transmission ECU monitors shift device positi

on and electric shifter position during vehicle

shut down. If a non-neutral shift device position and in gear position are detected during vehicle

shut down, this code will be set.

Fallback

No Fallback Mode. This is a non driving power down fault, it may cause a “-” dash during power up

if the transmission is torque locked after shutting down in gear.

Required Tools

• ServiceRanger a PC-based Service Tool

• Troubleshooting Guide

• Driver Instruction Book

Possible Causes

This fault code can be caused by any of the following

Expert:  Daniel Wilson replied 11 months ago.

Hi Sean, did you get this resolved?

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