Paul Graham
New Member
Hi,
I have exactly the same problem with my L322, TD6, 2006 with 140,000 mile.
Did it turn out to be a Seal in the C Clutch circuit? And can you tell me what the ball park cost was to get this repaired?
Thank you,
Paul.
Hi, albeit quite an old thread, but what would be the conclusion if there is no 1st gar engine braking?
Thank you in advance,
Tomo
Last edited:
Phil,
thank you very much for the reply. Would you be able to advice on the following problem and how to sensibly proceed?
- The car: L322, 2006, TD6 with GM5L50, had transmission rebuilt done by previous owner 4 years/40,000km ago (probably w/o changing or upgrading the valve block)
- The problems/symptoms: No 1st gear engine braking, reversing uphill gave "trans failsafe mode", and accelerating from standstill seems sluggish, else seems to drive ok,
- IIDTool error codes: LCM-Light Control: 0x59 Transmission emergency program fault ...and ... TCM-Transmission GM: 0x20 Output shaft speed sensor fault: General fault
- What I understood so far: valve blocks seem notoriously prone to leakage, thus burning up the clutches, and that the above failure codes don't tell much (at least to me)
Well, from here I don't know how to proceed, because I still don't understand the most likely cause of failure. Would a valve block swap/upgrade suffice? Would it make sense to do that first and if problem still exist have the tranny rebuilt. Any test I can perform to narrow down the problem?
Tomo
PS: a sonnax.com page lists one cause of "loss of reverse at high pressure" as "wear valve body cross leak"...that is the thin hair I'm clinging to....
Last edited:
The common factor would appear to be the Low & Reverse clutch as it provides engine braking in 1st gear and is also used in Reverse. Its function is to ‘earth’ the inner race of the Low Clutch sprag.
The clutch receives its hydraulic pressure from the Reverse Lockout Valve. I wonder if it might be worth removing the valve body assembly and checking both clutch feed holes with air pressure to see if the seals have failed?
Phil
The clutch receives its hydraulic pressure from the Reverse Lockout Valve. I wonder if it might be worth removing the valve body assembly and checking both clutch feed holes with air pressure to see if the seals have failed?
Phil
Phil,
again thank you. Am I correct to understand, that if I air pressure test both feed holes they should hold a certain pressure, or in other words there may be no air cross flow? Which would confirm tight seals, thus no problem there, which would point back to a leaky reverse lockout valve in the valve body?
Cheers
