Ground Offset: The Two-Thousand-Five-Hundred-Dollar ECU Replacement You Didn’t Need (And How to Avoid It)
After more than two decades building OBD cable assemblies and troubleshooting field returns, I’ve personally watched far too many perfectly serviceable engine control modules get condemned over a millivolt-level oversight. A bay will chase a stubborn MAF rationality code, an intermittent misfire, or a TPS that refuses to return to closed throttle. They’ll overlay the harness, verify supplies, scope the sensor, and […]