FP360 traces a major defect to an $800 component and stops millions in ongoing production losses
FP360 was engaged by a large Toronto-based automotive manufacturing plant to address a persistent quality defect causing auto body components to fail inspection and constraining plant throughput. The issue had forced the plant to operate at roughly 50% capacity, resulting in millions of dollars in weekly losses.
FP360 led an on-site investigation to identify the root cause and stabilize operations. What initially appeared to be a complex process failure was ultimately traced to a compromised measurement device: an $800 probe whose faulty readings masked the true condition of a critical treatment system.
By correcting the issue and reinforcing process controls through targeted training and updated procedures, FP360 helped restore quality, eliminate recurring downtime, and avoid a costly 55,000-gallon chemical system tank dump.
THE CHALLENGE:
The manufacturer was experiencing a persistent surface defect known as “tiger striping” during early-stage treatment of stamped auto bodies, resulting in finished parts failing quality inspection. Internal teams investigated the issue extensively, but no single driver emerged. In the meantime, production controls were tightened, reducing throughput by roughly half to limit scrap and rework.
The prolonged production slowdown resulted in millions of dollars in weekly losses and placed the operation at risk of a last-resort corrective action: dumping and recharging a major treatment system, which would have required discarding approximately 55,000 gallons of product.
OUR APPROACH
FP360 approached the engagement with a “go and see” mindset, prioritizing on-site observation and direct engagement over remote analysis. The team began by reviewing the manufacturer’s existing root cause work, building on prior analysis rather than starting from scratch. FP360 then observed the treatment process as it operated in real time, focusing on where assumptions or accepted conclusions might be masking variability or risk. This combination of structured review and firsthand verification enabled the team to quickly narrow the investigation and focus on the factors most likely to resolve the issue without unnecessary disruption.
THE SOLUTION
While on-site, FP360 recognized a passing comment from one of the line operators as a potential red flag: Fluoride readings in a treatment tank had remained unusually consistent for weeks. Such stability is highly unlikely in practice, prompting the team to look beyond the reported data and assess the reliability of the measurement system itself.
A closer inspection revealed a minute hairline fracture in the base of the probe, producing consistent but inaccurate readings over time. Replacing it with a new probe exposed dangerously elevated fluoride levels and confirmed the root cause of the tiger striping. Correcting the measurement failure resolved the defect and avoided the worst-case system dump, followed by updates to process controls and targeted training to prevent recurrence.
RESULTS
The tiger-striping defect was eliminated, and production returned to stable operating levels with no further downtime related to the issue. Quality failures and defective rework declined, removing the need for recurring fire drills across shifts.
To sustain the improvement, FP360 delivered a structured training program over several months, with sessions tailored for lab staff, line engineers, supervisors, and executive leadership. This approach reinforced both the technical changes and individual accountability, shifting the organization from one-time correction to lasting process discipline. The manufacturer continues to monitor performance (and replace the fluoride probe regularly), with quantified results to be reviewed after a full year of sustained operation.
BUSINESS IMPACT:
Avoided a catastrophic system dump and recharge, preventing the loss of 55,000 gallons of product and millions of dollars in additional downtime.
Restored confidence in process control by strengthening measurement reliability, documentation, and SOPs.
Delivered lasting operational stability through targeted training and follow-through, resulting in sustained defect reduction and stronger knowledge retention across teams.
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