P00B6 on Ford
Radiator Coolant Temperature / Engine Coolant Temperature Correlation
P00B6 on Ford vehicles indicates radiator coolant temperature / engine coolant temperature correlation. Au7o has documented this code across 1 Ford model — most commonly on Transit. This code sets when the engine computer sees too large a difference between the radiator coolant temperature sensor and the engine coolant temperature (ECT) sensor. The computer compares these two readings to verify that coolant is flowing properly through the cooling system. When the values do not correlate within the expected range, this code is stored. It can point to a cooling system flow problem, a faulty sensor, or contribute to overheating and reduced fuel economy. Typical repair costs on Ford range from $200 to $2,500, depending on the specific model and root cause.
Common Causes of P00B6
- •Faulty radiator coolant temperature sensor
- •Faulty engine coolant temperature (ECT) sensor
- •Stuck or failed thermostat affecting flow
- •Low coolant level or air in the cooling system
- •Wiring or connector fault at either sensor
- •Restricted coolant flow (clogged radiator or passages)
- •Faulty PCM/ECM (rare)
P00B6 on Ford by Model
Ford Transit(1 issue)
- Turbo Wastegate Actuator Sticking Causing Limp Mode2015-2022
The 3.5L EcoBoost twin-turbo Transit models experience wastegate actuator sticking, particularly on the passenger-side turbo. Carbon buildup and heat cycling cause the wastegate pivot to seize, resulting in either overboosting (wastegate stuck closed) or underboosting (stuck open). Overboosting triggers an immediate limp mode with reduced power. The issue is more prevalent in Transit vans used for towing or heavy cargo loads that keep the turbos under sustained high heat.
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View P00B6 across all makes →Frequently Asked Questions
What does P00B6 mean on Ford?▼
P00B6 stands for "Radiator Coolant Temperature / Engine Coolant Temperature Correlation." This code sets when the engine computer sees too large a difference between the radiator coolant temperature sensor and the engine coolant temperature (ECT) sensor. The computer compares these two readings to verify that coolant is flowing properly through the cooling system. When the values do not correlate within the expected range, this code is stored. It can point to a cooling system flow problem, a faulty sensor, or contribute to overheating and reduced fuel economy. On Ford specifically, this code is documented across 1 model.
What causes P00B6 on Ford vehicles?▼
Common causes on Ford: Faulty radiator coolant temperature sensor, Faulty engine coolant temperature (ECT) sensor, Stuck or failed thermostat affecting flow, Low coolant level or air in the cooling system, Wiring or connector fault at either sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P00B6 on a Ford?▼
Repair costs on Ford range from $200 to $2,500, depending on the specific model and root cause.
Which Ford models have P00B6 documented?▼
Au7o has documented P00B6 on 1 Ford model: Transit.