Express BCM Harness Damage
1. You may come across a 2003 Chevy Express with a 4.8L experiencing a security light on followed by a no start situation.
Don’t be too quick to replace the pass-lock cylinder or the BCM. Pull the glove box and take a close inspection of the BCM harness to make sure it has not come in contact with the dash support bar and shorted wires pertaining to the pass-lock circuit.
Express BCM Harness Damage
2. You may come across a 1999 Mitsubishi Galant with a 2.4L experiencing a rich operation with possibly no codes stored in memory.
Take a close inspection of the O2 harness connector near the thermostat housing. It is not uncommon to find antifreeze seeping into the connector creating a connection problem that will cause the ECM to see low O2 activity and command the ECM to increase fuel delivery.
