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Can anyone help with U1412 code

42032 Views 2 Replies 2 Participants Last post by  brandondill
2007 3500 c&c 6.7
U1412- no signal from speed sensor
I installed my engine brake switch, speedo quit working, abs light, and brake light on, so i unplugged everything i hooked up for engine brake switch and replaced speed sensor on rear axle, and still nothing, i keep getting this code, i tried unhooking batteries, and still have code and no speedo, is there a hidden fuse for this? any ideas on what else could be wrong?
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I'm going to try to figure out how to post the wiring diagram on here.


U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED




Theory of Operation
The ABS Module sends vehicle speed information over the CAN C Bus circuit to the ECM.

When Monitored:
Ignition on.

Set Condition:
The ECM gets an implausible signal over the CAN C circuit from the ABS Module. The circuit is continuously monitored. One Trip fault.


Possible Causes
CAN C BUS CIRCUIT SHORTED
CAN C BUS CIRCUIT OPEN
ABS MODULE
ECM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure).



1. ACTIVE DTC


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1. Ignition on, engine not running.
2. With a scan tool, read DTCs.


Is the U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED active at this time?

Yes

Go To 2

No

Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure).



2. U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT IS ACTIVE


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1. Continue reading DTCs.


Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) for the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT diagnostic procedure.

No

Go To 3



3. ABS MODULE IS ACTIVE ON THE CAN C BUS


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1. With the scan tool, select ECU View.
2. Verify that the ABS Module active on the bus.


Is the ABS Module active on the bus?

Yes

Go To 4

No

For No Response diagnostic procedures, (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) .
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).



4. ACTIVE DTCS IN THE FCM (TIPM)


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1. With the scan tool, select ECU View and select FCM (TIPM).
2. With the scan tool, read active DTCs.


Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE in the FCM at this time?

Yes

Replace the ABS Module per Service Information.
Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

No

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure).
 

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Basically its going to be the CAN bus circuit or a module.

Also if you can't find the problem you can try to restore the vehicle configuration but you will have to take it to the dealer for that.
 
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