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B337 loss of programmer communication


Don Mc

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Need help with this trouble code can't figure out why it keeps coming back.

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Is the HVAC working properly ? Is the "DO NOT REMOVE" cover in place on the ALDL socket ?

 

 

Edited by Padgett
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AC blows ice cold while driving when you come to a stop it gets warm at idle you can hear the AC clutch going off and on constantly but above idle it stays on the Aldl connector does have the cover on

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Vents switch properly ? Heat works ? If all good then might just R&R the programmer connectors.

"AC clutch going off and on constantly" sounds like freon is a little low. When the low side drops under 20 psi it will cycle. With R134A I generally look for 35-40 psi on the low side.

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