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P061B Code Cruise Control Only

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Old Apr 13, 2025 | 11:58 AM
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Anatoly
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2001 E55 AMG
P061B Code Cruise Control Only
Hello Everyone,
When turning on my cruise control, for some reason, the car throws "rear diff lock inoperable" and "active brake control" errors.
The CEL also comes on with P061B code.
After restarting the car the rear diff / active brake control disappears, but the CEL stays on.
After resetting the CEL it does not come back.

It only happens when I turn on cruise control; other than that, the car has zero issues.
Anyone know what it could be?
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Old Apr 13, 2025 | 05:28 PM
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W213 All-terrain
If your car is 63S, I would start to diagnose the rear differential,
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