I have a really bad driveline vibration as soon as i hit 65MPH it has never done this before handles fine and no noises anyone have a good reson to what it might be, also i have a code P0573 brake switch high anyone know what that means? thanks dennis

 

Alot of people have complained about vibrations like this and it usually ends up being a u-joint.

 

X2 on the u-joint. Other things could be tire balance, carrier brg, driveshaft lost a weight, but u-joint or tire balance is most likely. As for the P0573 code.......here's the service manual diagnostics.

P0573-HIGH VOLTAGE DETECTED AT THE BRAKE SWITCH




For a complete wiring diagram Refer to Section 8W.

When Monitored:
While the ignition is on.

Set Condition:
The brake switch status is = to ON and the not brake switch status is = to OFF for a calibrated amount of time.

Possible Causes
DAMAGED WIRING HARNESS OR CONNECTORS
BRAKE SWITCH CIRCUIT OPEN (BRAKE SWITCH WILL ALWAYS BE ON)
BRAKE SWITCH CIRCUIT SHORTED TO BATTERY VOLTAGE (BRAKE SWITCH WILL ALWAYS BE ON)
BRAKE SWITCH
ECM


Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

1. BRAKE SWITCH CIRCUIT OPEN

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Turn the ignition off.
Disconnect the brake switch connection. Inspect the pins and connector for damage, corrosion, etc.
Disconnect the ECM connectors. Inspect the pins and connector for damage, corrosion, etc.

NOTE: Check connectors - Clean/repair as necessary.


Measure the resistance between the brake switch signal circuits in the ECM connector and the brake switch connector.

Is the resistance less than 10 ohms?

Yes
Go To 2

No
Repair the open brake switch circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



2. BRAKE SWITCH CIRCUIT SHORTED TO VOLTAGE

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Measure the voltage between the brake switch circuits in the ECM connector and battery negative.

Is the voltage less than 1 volt?

Yes
Go To 3

No
Repair the open circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



3. ECM

--------------------------------------------------------------------------------
Reconnect the ECM connectors.
Install a jumper wire in the brake switch connector between signal circuit and to ground.
Turn the ignition on.
Cycle the brake pedal several times.
Using the scan tool, read the DTC's.

Is the DTC for brake switch low voltage present?

Yes
Go To 4

No
Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



4. BRAKE SWITCH

--------------------------------------------------------------------------------
Reconnect the brake switch connector.
Using the scan tool, clear the DTC's.
Turn the ignition on.
Cycle the brake pedal several times.
Using the scan tool, read the DTC's.

Has the brake switch High DTC returned?

Yes
Replace the brake switch.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No
Perform Intermittent condition test.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

 

thanks guys

 

well i got that same code..i had a u joint go about a week ago and i replaced it, never checked codes, truck was good again today i check my codes and i have p0573 and before i even drive anywhere i have a weird vibration at idle what else could set this code off other than a ujoint and that brake switch, i feel stupid for asking but i cant figure out what the brake switch is

 

i have the vibration at about 65 to 75 mph. DC replaced my hole drive shaft, and still have it. i think its in the X-case. seems i read that some where on here.