Real shop case
Reduced power: a Duramax rail-pressure case
Follow the Sierra’s sensor checks, replacement and shop-confirmed return to full power with zero DTCs.
English diagnostic guides
Questions behind the next parts decision.
Case-led reading for shop owners and service managers. Follow the concern, findings and next step.
Real shop cases
Reported outcomes from the shop—not independent or OEM verification, and not a prediction for another vehicle.
Real shop case
No PCM communication: organize the evidence
Separate the reported concern, guided checks and subsequent RAM repair report.
Edited, simulated examples
These test cases end at recommendations and requests to verify. No completed physical repair is established.
Simulated test case
P0299 does not automatically mean a turbo
Follow the Cruze example to its final recommendation—not a completed repair.
Simulated test case
Slow crank: look at the ground path
See why the Silverado example ends with connection cleaning and a retest recommendation.
Findings first. The technician decides.
These case reviews are not service procedures. The technician performs safe testing, uses applicable vehicle-specific service information, makes repair decisions and verifies the result.
Explore the app and its limits →