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Code P1690 typically indicates a communication issue between the engine control module (ECM) and the transmission control module (TCM). To fix it, start by checking the wiring and connectors for damage or corrosion. Ensure that both modules are receiving proper power and ground. If the connections are good, consider updating the software for the ECM or TCM, or replace the faulty module if necessary.
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What is the Code P1690 on your diesel Ram?
DTC P1690: FUEL INJECTION PUMP CKP (CRANK) SENSOR DOES NOT AGREE WITH ECM CKP (CRANK) SENSOR. Monitor and Set Conditions: Fuel injection pump crankshaft position circuit is monitored when ignition is on and engine is running. DTC may be stored when no signal exists within specified window parameters with no Camshaft position (CMP) sensor or CKP DTCs present.
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