No start, horn and turn signals not working?

BHAMDOC1973

MEMBER
2009 MERCEDES BENZ ML350
V6
4WD
AUTOMATIC
130,000 MILES

A friend of mine sent me this car to look at. All of a sudden one day it won't start, no clicks or any noises, not the battery, I doubt it is the starter as well. Scanned it and it has codes:
0722
c002
c426
2226

C426 is the main one I think, I am trying to find if it's the common module behind the key ignition that requires soldering or the SAM.
I'm not sure if the ignition module would cause a no turn signal or horn. Fob still works and locks and unlocks.
All lights come on when you turn ignition on.

3 Replies

BHAMDOC1973

MEMBER
1,291 POSTS

I disconnected the battery cable and connected back after few seconds and it started, ugh, not sure what is going on.

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Friday, August 18th, 2023 AT 5:43 AM

BHAMDOC1973

MEMBER
1,291 POSTS

While its still running I scanned it.

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Friday, August 18th, 2023 AT 6:23 AM

KEN L

MASTER CERTIFIED MECHANIC
42,935 POSTS

I would start by checking all fuses with the systems on.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are good, it sounds like the EIS needs to be replaced. There is a TSB for this problem which I have attached.

Here are the descriptions of the diagnostic trouble codes (DTCs) you provided for a 2009 Mercedes-Benz ML350:

DTC 0722 - Output Speed Sensor Circuit No Signal: This code indicates that the vehicle's transmission control module (TCM) is not receiving a signal from the output speed sensor. The output speed sensor monitors the speed of the output shaft of the transmission. Possible causes for this code include a faulty output speed sensor, wiring or connector issues, or a problem within the TCM itself.

DTC C002 - Left Front Wheel Speed Sensor Signal: This code pertains to an issue with the left front wheel speed sensor signal. The wheel speed sensors are responsible for providing data to the vehicle's anti-lock brake system (ABS) and traction control system (TCS) to monitor wheel speeds and ensure proper braking and stability. Possible causes include a faulty wheel speed sensor, damaged wiring or connectors, or issues within the ABS/TCS module.

DTC C426 - Steering Angle Sensor Internal Fault: This code points to a problem with the steering angle sensor. The steering angle sensor measures the position and rotation of the steering wheel, providing crucial data to the vehicle's stability control systems. An internal fault in the sensor itself or a wiring/connection issue could trigger this code.

DTC 2226 - BAS Hydraulic Pump Motor Malfunction: This code is related to a malfunction in the Brake Assist System (BAS) hydraulic pump motor. The BAS system assists the driver in applying maximum braking force during emergency braking situations. A faulty hydraulic pump motor, a wiring issue, or a problem with the BAS control module could trigger this code.

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