Pmax brand exclusion only in search - data trust issues?

miaaffiliate

I've been running Pmax campaigns with brand exclusion set so the brand only shows in Shopping. The numbers feel off, especially since my brand+product keywords have tanked for the last two months.

Tried to dig into the Channels report-split by 'Search Network with product data' and 'without product data'-but honestly, I don't trust it to tell me when Shopping actually fires vs. when it doesn't. Is there any script or reliable metric to confirm Shopping ads aren't popping up on branded queries?

After some digging, couple of things I've found (and this took way too long to piece together):

No API or custom report can definitively tie a specific search term to a specific ad format inside Pmax. If your brand+product terms are dying, the algorithm's probably misreading the exclusion on mixed-intent queries. Someone searches [brand name] + [generic product category], and Pmax search drops out because of the exclusion-but Shopping might not pick it up either due to feed issues or low bids. The fix? Fully exclude brand from the whole Pmax campaign (ignore that Shopping override checkbox) and run a dedicated standard Shopping campaign for brand terms.

Also, the Channels report can be made useful if you filter properly: segment by 'search network with product data', add secondary dimension for search terms, and check a 30-day window for your brand. If brand impression share in Shopping is still low after two months with exclusions on, your exclusion list probably doesn't cover misspellings or abbreviations. Cross-check against your standard Shopping search terms report. I've got a script setup for flagging brand bleed in Pmax if anyone wants it-DM me.

And obviously, run a brand keyword check in auction insights to confirm you're showing where you think you are.

storyweaver

Oh, Performance Max. The gift that keeps on giving... headaches.

Look, I've been down this exact rabbit hole. There's no magic script, API call, or secret report that'll tell you whether a specific search term got hit by the Shopping side or the Search side inside PMax. You just have to stare at it and guess, like a marketing fortune teller.

If your brand+product terms have been tanking for the last couple of months, the algorithm is almost certainly mangling your exclusion logic on mixed-intent queries. Classic example: someone types "[brand name] + [generic product]". Your brand exclusion pulls the Search side out... but the Shopping side might also drop the ball because of a feed hiccup or a bid cap that's tighter than my budget after a Black Friday.

My advice? Do the sane thing: kick the brand out of PMax entirely. Don't even touch that Shopping override checkbox. Then build a dedicated standard Shopping campaign just for your brand terms. It's boring, it's manual, but at least you'll know what the hell is happening.

chatbox

The channels report is your best bet here, but only if you're filtering it properly. I'd segment by "Search network with product data" and add a secondary dimension for search terms - then run a 30-day window to see if your brand name pops up at all.

If brand impression share in Shopping is still low after two months with brand+product exclusions on Pmax, the exclusion list likely isn't catching all brand query variants. Here's the process I follow:

Audit your exclusion list for common misspellings and abbreviations (e.g., "brnd" instead of "brand", or "co" for "company").
Cross-reference that list against the search terms report in your standard Shopping campaigns if you're running both concurrently.
Look for any term that contains a fragment of your brand - even if it's buried in a long-tail query.

I've got a script I use for flagging brand bleed in Pmax that I'd be happy to share if you want. Drop me a note and I'll send it over.

dailygrind

I always start by running a brand keyword audit in auction insights. Quick sanity check on whether you're actually showing where you expect.

24fire

Directional is the right word - but direction alone won't keep your brand safe. I've found the PMax channel report tells you where the bus went, not who drove it.

The real proof lives in Merchant Center product-level data and any search term crumbs you can scrape. Pair that with brand impression share from your Search campaigns. If you see brand queries leaking into insights, your exclusion isn't holding. Treat reporting like a telescope, not a microscope.

weekendhustle

The Channels report can be misleading with P.Max, so I would not fully rely on it alone. The best way is usually to check Search Terms Insights + Auction Insights and compare impression share on branded queries before and after the exclusion.

You can also run a script pulling campaign/search category data from the Google Ads API, but honestly Google still keeps a lot of P.Max search visibility opaque. Brand exclusions should block text ad serving on branded search, but Shopping placements can still appear if product relevance is strong.

miaaffiliate

pmax with brand exclusion only in search? good luck squeezing real margins out of that setup. on the channels report, the secondary dimension option isn't obvious - you have to manually enable it via the segmentation menu (top right, looks like a column icon). Click that, then "Add secondary dimension." It's buried because Google doesn't want you digging too deep into their black box. I've found it barely useful for affiliate traffic anyway, the real insights come from UTM tags and a proper tracking setup