yjyerks Posted January 6, 2016 Share Posted January 6, 2016 I am currently servicing our 2001 mack cl700 with the cummins 600 engine, we keep getting the wrench light but when i actually have it in the shop to check the codes the light is no longer on, The truck has had a rough idle all year, once in a while it will stall, but mainly we will be driving with a load and it will slow down in a limp mode and the wrench light and electrical malfunction light come on. Any suggestions would be great. Quote Link to comment https://www.bigmacktrucks.com/topic/43404-2001-mack-limp-mode-idle-surge-random-light/ Share on other sites More sharing options...
hatcity Posted January 6, 2016 Share Posted January 6, 2016 what does the Cummins computer say?wingdale..just up 22 from Brewster Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/43404-2001-mack-limp-mode-idle-surge-random-light/#findComment-318855 Share on other sites More sharing options...
Challenger Posted January 6, 2016 Share Posted January 6, 2016 Can you read inactive codes? Record inactive codes, clear codes, run truck and see what codes come back. Active or inactive, see what comes back. Quote Link to comment https://www.bigmacktrucks.com/topic/43404-2001-mack-limp-mode-idle-surge-random-light/#findComment-318859 Share on other sites More sharing options...
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