Fault code C1142

MB-POWER

MEMBER
2001 MERCEDES BENZ ML320
3.2L
6 CYL
4WD
AUTOMATIC
198,840 MILES

When we start engine and after seven minutes, three lights comes on (see attached)
then gear change to R or D strongly!
Also, if we drive the car, transmission will not change (stuck in one gear only)
but if we turn engine off and on again every thing will be fine for the next seven minutes.
After scanned we found following code :
C1142 : B24/2 (ESP LATERAL ACCELERATION SENSOR (LAS)
Note : check engine light do not appear at any time (I think it is removed or canceled).
Note two : ABS and speed sensors, ABS connector (all) has been removed and cleaned. All relays and fuses checked.
Any advice please.
Thanks

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7 Replies

KHLOW2008

MECHANIC
41,815 POSTS

The ESP Lateral Acceleration Sensor is most likely faulty and needs to be replaced. I am not sure of the exact location for your vehicle but should be mounted in the trunk behind the rear seat under a plastic panel.

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Monday, November 20th, 2017 AT 1:03 AM

MB-POWER

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I think it is near gear shift.
Any advice about check engine light? Why it is not there? Does that mean there are a fault or problem with the ECU it self?
Regards

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Monday, November 20th, 2017 AT 3:02 AM

KHLOW2008

MECHANIC
41,815 POSTS

Does the check engine light come on when ignition is first turned to "on"?
If it does not come on then, it could be a fault with the bulb. Are there any fault codes for the engine? If not, it would not turn on when other systems are faulty. Only the later versions of vehicle which uses can-bus system would trigger the MIL if other systems are faulty.
By the way, yes, the control unit could be under the console.

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Monday, November 20th, 2017 AT 5:26 AM

MB-POWER

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80 POSTS

Hi,
How we can test The ESP lateral acceleration sensor because we cannot find another one (used or new) in my country?
Note :
if we requested one throw eBay, it is will take more than a month to receive it.
Thanks

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Wednesday, November 22nd, 2017 AT 1:32 AM

KHLOW2008

MECHANIC
41,815 POSTS

I do not have any information for testing the sensor and now I am not able to access our database, which might not have the testing procedure too. So I am afraid I am not able to help you on this.