24 Valve Engine and Drivetrain Discuss the 24 Valve engine and drivetrain here. No non-drivetrain discussions please. NO HIGH PERFORMANCE DISCUSSION!

codes 0645, 1693

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Old Oct 27, 2008 | 06:10 PM
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southerman's Avatar
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From: texas/oklahoma
codes 0645, 1693

ok just replaced lift pump a couple of days ago,every morning since truck drags when you try to start it, once it starts the overdrive light come on. so i cycled my ingition, got codes,0645,1693. truck still has plenty of power what gives?
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Old Oct 27, 2008 | 07:39 PM
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0645 A/C Clutch Relay Circuit
1693 DTC Detected In Companion Module, DTC Detected In PCM/ECM
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Old Oct 27, 2008 | 09:03 PM
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what is dtc is this aproblem or can u resett it?
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Old Oct 27, 2008 | 09:57 PM
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DTC Diagnostic Trouble Code
My guess, if you fix the 0645 the 1693 will disappear also.
Did you bump or pull any wires while replacing the lift pump?
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