Coolant Temperature Sensor Correlation Issue
Code P00B6 indicates a correlation problem between the radiator coolant temperature sensor and the engine coolant temperature sensor. The PCM detects that the two sensor readings differ by more than a calibrated amount, suggesting a stuck thermostat, low coolant, air in the system, or a faulty sensor. This can lead to improper engine cooling and potential overheating.
01. Most Common Causes
- Stuck open or closed thermostat
- Low coolant level or air pockets in cooling system
- Faulty radiator coolant temperature sensor
- Faulty engine coolant temperature sensor
- Wiring or connector issues in sensor circuits
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine overheating or running cooler than normal
- Poor fuel economy
- Erratic temperature gauge readings
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect coolant level and condition; check for leaks.
Step 3: Compare live data from both coolant temperature sensors using a scan tool.
Step 4: Test thermostat operation by monitoring warm-up behavior.
Step 5: Check sensor wiring and connectors for damage or corrosion.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as it may indicate a cooling system issue that could lead to engine overheating and severe damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if the thermostat or other components need replacement.