ABS/TC/Active Handing warnings

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Oct 1, 2018 | 04:41 PM

TCW

Thread Starter

Le Mans Master

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From: Maryville TN

St. Jude Donor '06-13,'16-'17, '19

ABS/TC/Active Handing warnings

When I hit a hard bump the "Service Active Handing, Service Anti Lock Brake, and Service Traction Control" warning comes on the DIC and the TCS and ABS lights illuminate on the instrument cluster.

So far, I have installed the "comb" in the steering wheel position harness (per a TBS for 05-08 Corvettes) and checked the connections to the wheel speed sensors.

After a reset by turning the ignition on/off, the problem clears until the next hard bump. My cheap code reader shows NO codes being set!

HELP!!!!

Tom

Last edited by TCW; Oct 1, 2018 at 04:44 PM.

Oct 1, 2018 | 05:42 PM

MTPZ06

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From: Honolulu HI

Might be an issue with your EBCM...and your cheap code reader wont be able to read those EBCM codes. You'll need a Tech 2 or equivalent.

Last edited by MTPZ06; Oct 1, 2018 at 05:42 PM.

Oct 1, 2018 | 09:16 PM

Dano523

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What DTC codes?

Oct 2, 2018 | 08:31 AM

TCW

Thread Starter

Le Mans Master

Joined: Jan 2001

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From: Maryville TN

St. Jude Donor '06-13,'16-'17, '19

Quote:

Originally Posted by Dano523

What DTC codes?

No codes are being shown on my code reader.

Tom

Oct 2, 2018 | 01:25 PM

MTPZ06

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From: Honolulu HI

Quote:

Originally Posted by TCW

No codes are being shown on my code reader.

Tom

As I mentioned in my previous post, you'll need a Tech2 (or comparable) to pull EBCM codes. The fact that when you hit a bump and the issue reappears suggests (to me) perhaps a cold solder joint in your EBCM.

Oct 2, 2018 | 11:03 PM

Got uid0

Le Mans Master

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St. Jude Donor '17

Quote:

Originally Posted by MTPZ06

Since you are able to clear the code and it is not a hard set requiring a tech2/clone to clear it you can most likely not a true ABS failure and can rule out ebcm, and speed sensors in the wheel bearing. Dano correct me if am wrong.

You might want to check for loose or bad connection in the plug wires that connect to the speed sensors and check all spark plug wires as crazy as it sounds a bad spark plug wire / connection will set this code.

Last edited by Got uid0; Oct 2, 2018 at 11:07 PM.

Oct 3, 2018 | 11:48 AM

TCW

Thread Starter

Le Mans Master

Joined: Jan 2001

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From: Maryville TN

St. Jude Donor '06-13,'16-'17, '19

Quote:

Originally Posted by Got uid0

You might want to check for loose or bad connection in the plug wires that connect to the speed sensors and check all spark plug wires as crazy as it sounds a bad spark plug wire / connection will set this code.

BINGO! It was the left rear wheel speed sensor. The plug pack is supposed to mount on a bracket. The plug pack came loose from the bracket and was dangling freely. Over time it broke one of the wires inside the insulation. On bumps, the harness would sway and briefly open the connection.

A little solder and remounting the plug pack and the problem is solved!

Thanks for the hints guys!

Tom

Oct 3, 2018 | 01:36 PM

Dano523

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Quote:

Originally Posted by TCW

Sounds like you found your problem, but keep in mind others that the rear hub sensor wires go through C186 connector right next to the battery under the hood.

So if the problem is not the connector at the wheel hub and the wheel hub senor checks out as fine, could be a problem with the C186 connector isntead.

Last edited by Dano523; Oct 3, 2018 at 01:36 PM.