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sprinkles08, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 22677
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Check Engine Light, Code PO720, Code PO600 Communication

Customer Question

Check Engine Light , Code PO720, Code PO600 Communication Link ESP, P20CC Rough Road Detection Signal. Communication fails with ETC and Esp. Lights on Dash, Brake Lining, Brake, ABS Esp. 2001 SLK 320
JA: Does the light stay on, or does it blink?
Customer: On.
JA: What is the model of your '01 Mercedes?
Customer: SLK 320
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Scanning myself. No parts replaced. 13 pin plug on Trans is clean.
JA: Anything else you want the mechanic to know before I connect you?
Customer: Scanner will ID the ETC and ESP but then a link failure. No Data
Submitted: 8 months ago.
Category: Mercedes
Expert:  Chad Farhat replied 8 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 8 months ago.

hey how are you

1-the DTC 20CC is ,when the abs whee sensors nit reading correctly , you need to hook up and scanee and pull up the ABS wheel sensors and see which one is off compoaring ti vehicle speed

'Rough Road Detection' Signal (By Comparing Wheel Speeds) : Speed Signal From Control Module ESP Implausible :: Read Fault Memory of Control Unit ESP (P0500) Test Wheel Speed Signals Note: The actual values are supplied through CAN bus from component N47-5 (ESP, SPS and BAS control module). Test requirements - CAN communication to control module N47-5 (ESP, SPS and BAS control module) is o.k. Test sequence - Switch on ignition. - Rotate relevant wheel.(n > 1/min ) - Status of the relevant actual values: - Vehicle speed left front axle: Note! Communication with ECU required - Vehicle speed left rear axle: Note! Communication with ECU required Specified values - Vehicle speed > km/h Question - Are the actual values o.k.? Yes The actual values are okay. ** End of Test ** No The actual values are not okay. Possible cause and remedy - Read fault memory from control unit ESP and rectify faults.

3-DTC P0720 is output speed sensor circuit malfunction .

4- DTC P0600 , review diagram please

4-what is the car doing ?

5- because the DTC 20CC could be causing all these other codes

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 8 months ago.
All codes set without moving the car. I can't see the wheel sensor data because there is no communication with the ESP,ABS module
Expert:  Chad Farhat replied 8 months ago.

if you can not communicate with the ABS module , unplug the connector ,inspect for broken pins not making a good connection ,

if all good ,and you checked all your fuses , then replace abs module ?

is your scanner capable if communicating with Mercedes abs module ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 8 months ago.
ABS/ESP module are on the ABS Pump. No communication with both. Are you a MB tech?
Expert:  Chad Farhat replied 8 months ago.

yes i m ,i know that it is all one unit , good luck

i will opt out this one .

Expert:  sprinkles08 replied 8 months ago.

Hello and welcome to JustAnswer!

If there are no fuses blown and the BS module does not communicate then the most likely cause would be the module itself but it could be a loss of power or ground due to a wiring issue. What needs to be done is load test the power and ground feeds at the module as well as test the communication bus voltages. If ok then the module can be condemned.

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