Successful CLB Install







There were 4 GM recalls for the column lock.
04006 - Feb. 04 through early Aug. 04
04006A - Aug. 04 through Nov. 04
04006B - Dec 04 through early Jan. 06
04006C - Feb 06 through present
The computer reflash was done as part of the final recall 4006C IIRC. As that recall was issued in Feb 06 I'd say you don't have the fuel cut off as you probably have 4006B fitted. Check the paperwork for the recall and it should say.
The recall was only done on A4s produced before 2000 but on all manuals.


Variation 04006C removed the lock ring on US cars after the Feds backed off the requirement for a column locking mechanism for manual transmission C5's. Pressure from the buying public and GM got that requirement lifted for C5's in the US. Canadian law still required the column locking mechanism as an added theft deterrent.
I still find it amazing when the word safety appears through all the paperwork that GM have now decided to charge for this failed mod.
Of interest, the newer export A4s also have to retain the CL
Last edited by DeeGee; May 27, 2009 at 01:41 AM.
The safety issue that NHTSA was concerned with was the potential to drive the car with the column locked. That certainly qualifies as a safety issue. The part of the GM service that corrects this with 100% effectiveness is the reflash of the PCM to set a fuel shutoff value of 1.5 MPH. The remainder of what GM was attempting with the K Harness was to improve the communications between the Actuator and the BCM and make an extremely poor design work the best possible at the least expense to GM. ( The poor relays that GM chose actually made the communication less relaible but since the loss of communication between the BCM and the Actuator leaves the BCM assuming the column is locked, the error is on the safe side) If the BCM thinks the column is locked (sort of the default status of the BCM until it gets a completed signal back from its unlock signal) it signals the PCM to enable fuel shutoff. The BCM then goes about its normal operations as though everything is fine. But when the car is attempted to be driven the PCM cuts fuel at 1.5 MPH. That keeps NHTSA happy that the car can not be driven with a locked column.
Unfortunately there are many things that can prevent the BCM from receiving the completed signal from its unlock command. For example, a low battery may fail to operate the mechanical relays or actuator, the Serial data buss, over which the signals flow for all communications between the BCM and any sensor, might be busy with signals from another sensor, the lock pin might be jammed in the lock ring and require more than 30 milliseconds for the actuator to withdraw the lock pin, if there is a K harness installed the relay in the K Harness may have failed so that the actuator may never have received the unlock signal, the microswitch in the actuator which is responsible for sending the completed signal to the BCM may have failed (in either the locked or unlocked state), the actuator may have mechanically failed and the list goes on and on. In a nutshell the system is far too complicated and prone to failure.
Since the safety problem is cured by the PCM reflash with the 1.5 mph fuel shutoff, GM has met the requirements of the NHTSA recall. So GM can say we fixed the safety problem and now the vehicle owner is financially responsible for the other components that may fail after we fixed them once free of charge. They CANNOT refuse to do the initial recall on a vehicle that has never been serviced under the recall. The Safety portion of the recall has NO expiration date. GM took the financially best option for themselves when they announced that after March of 2008 the vehicle owner is now responsible for repairs to the Column Lock System IF it has been serviced once by GM free of charge.
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The safety issue that NHTSA was concerned with was the potential to drive the car with the column locked. That certainly qualifies as a safety issue. The part of the GM service that corrects this with 100% effectiveness is the reflash of the PCM to set a fuel shutoff value of 1.5 MPH. The remainder of what GM was attempting with the K Harness was to improve the communications between the Actuator and the BCM and make an extremely poor design work the best possible at the least expense to GM. ( The poor relays that GM chose actually made the communication less relaible but since the loss of communication between the BCM and the Actuator leaves the BCM assuming the column is locked, the error is on the safe side) If the BCM thinks the column is locked (sort of the default status of the BCM until it gets a completed signal back from its unlock signal) it signals the PCM to enable fuel shutoff. The BCM then goes about its normal operations as though everything is fine. But when the car is attempted to be driven the PCM cuts fuel at 1.5 MPH. That keeps NHTSA happy that the car can not be driven with a locked column.
Unfortunately there are many things that can prevent the BCM from receiving the completed signal from its unlock command. For example, a low battery may fail to operate the mechanical relays or actuator, the Serial data buss, over which the signals flow for all communications between the BCM and any sensor, might be busy with signals from another sensor, the lock pin might be jammed in the lock ring and require more than 30 milliseconds for the actuator to withdraw the lock pin, if there is a K harness installed the relay in the K Harness may have failed so that the actuator may never have received the unlock signal, the microswitch in the actuator which is responsible for sending the completed signal to the BCM may have failed (in either the locked or unlocked state), the actuator may have mechanically failed and the list goes on and on. In a nutshell the system is far too complicated and prone to failure.
Since the safety problem is cured by the PCM reflash with the 1.5 mph fuel shutoff, GM has met the requirements of the NHTSA recall. So GM can say we fixed the safety problem and now the vehicle owner is financially responsible for the other components that may fail after we fixed them once free of charge. They CANNOT refuse to do the initial recall on a vehicle that has never been serviced under the recall. The Safety portion of the recall has NO expiration date. GM took the financially best option for themselves when they announced that after March of 2008 the vehicle owner is now responsible for repairs to the Column Lock System IF it has been serviced once by GM free of charge.


















