Possible causes

– Weak battery – Low voltage while cranking
– Faulty Engine Control Module (ECM) relay
– Blown ECM fuse
– Faulty ECM
– ECM harness is open or shorted
– ECM circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0690 Information for specific makes

P0690 CHEVROLET
P0690 CHRYSLER
P0690 DODGE
P0690 FORD
P0690 ISUZU
P0690 JEEP
P0690 MAZDA
P0690 MITSUBISHI
P0690 SUZUKI