Jeep Grand Cherokee Won’t Start
Case Study: Solving a No-Start Communication Fault in a 2012 Jeep Grand Cherokee When a vehicle won’t crank, it’s easy to assume the battery or starter is to blame. But sometimes, the root cause lies deeper in the vehicle’s network—where modules stop talking to each other entirely. That was the case with this 2012 Jeep Grand Cherokee, which came to ...
Intermittent Misfire on a 2010 Acura MDX
Some vehicle issues aren’t obvious at first glance—and diagnosing them requires a methodical, data-driven approach. That was the case with this 2010 Acura MDX, which came into our shop with a check engine light and a rough idle on cold start. The Complaint The customer reported that the engine idled rough on startup but would smooth out once the vehicle ...
Check The Check Engine Light
Case Study: Software Fix for an Active CEL on a Kia/Hyundai with No Driveability Issues Sometimes, a check engine light (CEL) is a sign of an underlying mechanical fault. But in other cases, it’s simply a software issue—especially when the car is running perfectly. This case study highlights how a factory bulletin and proper diagnostics resolved an “all systems normal” ...
Diagnosing a Rough Idle on a BMW 535i
At CMD Automotive, we see all kinds of performance issues come through the door—and we pride ourselves on getting to the root of the problem, not just clearing the check engine light and sending you on your way. Here’s a recent example from a 2014 BMW 535i with about 108,000 miles on the odometer. The Complaint The customer came in ...
This Chevy Tahoe Was Drinking Fuel—and How We Fixed It
Fuel in the Oil? The Hidden Problem Behind This Tahoe’s Poor MPG When a check engine light is paired with poor fuel economy, it’s often a sign of a deeper issue within the engine’s fuel management system. This 2016 Chevy Tahoe came in with both problems—and diagnosing it required a thorough process of elimination to find the real culprit. The ...