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Unable to Program TCM
This truck originally came in with a complaint of not up shifting. Duramax and Allison. It had P0972 (SS 1 open), P0975 (SS 2 open), and P2671 (high cont. ckt. group 2 Hi volts)I tapped into ckt 1222 KOEO and found 3.8V. Used TechII to activate SS1 on and volt... Login to read more. 
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19 Replies Received
19 Replies Received
| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
Vehicle Data
2006 Chevrolet Silverado 2500 HD LS 6.6L
| Engine | 6.6 L |
| Trans | 6-speed Automatic (Electronic) |
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