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2008 Jeep Compass put in dealership for crossmember

Customer Question
replacement under extended warranty had...
2008 Jeep Compass put in dealership for crossmember replacement under extended warranty had control arms replaced same time. When i retrieved my jeep the Traction control light was on with no engine power also idling rough. Used code reader to get c121c code for torque request signal denied. Any common problems or possibility a wife was disturbed at the dealer while getting parts changed?
Submitted: 8 months ago.Category: Jeep
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Answered in 14 minutes by:
11/13/2017
Jeep Mechanic: Gunvir Singh,
 replied 8 months ago
Gunvir Singh
Category: Jeep
Satisfied Customers: 2,013
Experience: Master Tech at Kennesaw Auto Tech
Verified

Hello, let me review your request. Please stand by.

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Jeep Mechanic: Gunvir Singh,
 replied 8 months ago

Is c121c the onl code present?

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Customer reply replied 8 months ago
it is
Jeep Mechanic: Gunvir Singh,
 replied 8 months ago

The code is triggered when there is no yaw control or traction control infor sent to the pcm for an extended period of time which is usually a result of a faulty pam or abs control module. But since this issue occuered after a majuor susoension repair need to start by making sure all the body grounds are connected properly and make sure none of the fuses blew or electrical connector left loose when the repair was done. IF everything else is good the problem is either a fault abs module or pcm.

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Jeep Mechanic: Gunvir Singh,
 replied 8 months ago

Hello, just checking if any updates?

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Customer reply replied 8 months ago
Cannot find any broken wires or bad grounds.
Jeep Mechanic: Gunvir Singh,
 replied 8 months ago

If wiring, ground and fuses are good then next step is to check fopr proper communication between pcm and abs module.

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Customer reply replied 8 months ago
Any wiring diagram to check this? And how to check? Ohm metre or test light?
Jeep Mechanic: Gunvir Singh,
 replied 8 months ago

A compatible scan tool will be needed to check proper communication between both modules.

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