P00B7 on RAM
Engine Coolant Flow Low/Performance
P00B7 on RAM vehicles indicates engine coolant flow low/performance. Au7o has documented this code across 1 RAM model — most commonly on 2500. 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. Typical repair costs on RAM range from $250 to $700, depending on the specific model and root cause.
Common Causes of P00B7
- •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
P00B7 on RAM by Model
RAM 2500(1 issue)
- 6.7L Cummins Water Pump Coolant Leak (Fire Hazard Recall 17V562000)2013-2018
The concentric (belt-driven) water pump on 6.7L Cummins trucks can leak coolant and suffer bearing failure. NHTSA recall 17V562000 covered 2013-2017 Ram 2500/3500 and cab-chassis trucks whose water pump lacked a vent hole, allowing coolant to leak onto hot engine components and create a fire risk. Separately, owners report the pump bearing seizing and throwing the serpentine belt, one at just 32,000 miles while towing, leaving the truck without cooling or charging. Symptoms include coolant weeping from the weep hole, whining/grinding from the pump, and overheating.
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View P00B7 across all makes →Frequently Asked Questions
What does P00B7 mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes P00B7 on RAM vehicles?▼
Common causes on RAM: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P00B7 on a RAM?▼
Repair costs on RAM range from $250 to $700, depending on the specific model and root cause.
Which RAM models have P00B7 documented?▼
Au7o has documented P00B7 on 1 RAM model: 2500.