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)

P0687 Description

The Engine Control Module (ECM) has detected a high voltage condition to the ECM.

P0687 Information for specific makes

P0687 AUDI
P0687 BMW
P0687 CHRYSLER
P0687 DODGE
P0687 ISUZU
P0687 JEEP
P0687 SUZUKI
P0687 VOLKSWAGEN