P00B7 on Cadillac: How to Diagnose & Fix
Engine Coolant Flow Low/Performance
1 Cadillac model · 1 documented issue · 1 critical · $350-$700 repair
P00B7 on Cadillac by model: symptoms, diagnosis and fix
The 3.6L V6 water pump develops an internal seal failure that lets coolant seep from the pump's weep hole — a designed indicator that the pump's internal shaft seal has failed. Owners commonly mistake the weep-hole drip for a 'pinhole' and try stop-leak, but it signals the pump is failing internally and will progress to overheating and potential head-gasket/engine damage. Low-coolant warnings, sweet smell, and white residue at the front of the engine are typical. RepairPal lists coolant leaks (pump, hoses, radiator) among the most common XTS cooling complaints.
Common Symptoms
- Coolant dripping from weep hole / front of engine
- Low coolant warning
- Sweet coolant smell
- White or orange crust on water pump
- Engine temperature creeping up / overheating
- Puddle under front of car
How to Fix
Confirm the source: clean the area and look for fresh coolant tracking from the weep hole below the water pump pulley (versus hose clamps or the radiator). Replace the water pump with a new OEM/ACDelco unit and gasket, refill with DEX-COOL, and pressure-test. Do NOT use stop-leak — it can clog the heater core and radiator. ACDelco Gold water pump PN 19325605 (aftermarket ACDelco 252-962 cross-reference); inspect the thermostat and upper/lower hoses while the system is open.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Engine Water PumpCross-refWPGM-611V
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
P00B7 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P00B7 mean on a Cadillac?
P00B7 stands for "Engine Coolant Flow Low/Performance." P00B7 means the powertrain control module has determined that coolant flow through the engine's cooling system is too low or not performing as expected. The computer compares signals — typically from the engine coolant temperature sensor and a second temperature sensor (such as the radiator outlet) — and flags this code when the readings indicate coolant isn't circulating properly to manage engine temperature. Restricted flow can let the engine run hotter than designed, risking overheating. The cause is usually a thermostat, water pump, low coolant, or a sensor reading problem. On Cadillac it is documented across 1 model: XTS.
What are the most common causes of P00B7?
The most common causes of P00B7 are: Stuck or faulty thermostat, Low coolant level or air pockets in the system, Failing water pump (mechanical or electric), Faulty engine coolant temperature or radiator temperature sensor, Clogged radiator, hoses, or coolant passages with sediment/debris, Coolant leak reducing system volume, Wiring/connector faults at the temperature sensors or PCM control issue. The specific cause varies by vehicle.
How much does it cost to fix P00B7 on a Cadillac?
Published repair estimates on Cadillac range from $350 to $700 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P00B7 on a different make?
View P00B7 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.