Error code
OBD2 P0189
OBD2P0189
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Fuel Temperature Sensor B Circuit Intermittent.
Severity
moderateYou can continue driving, but expect poor performance and fuel economy.
Summary
P0189 indicates an intermittent issue with the fuel temperature sensor B circuit in your vehicle's fuel system.
Symptoms
- Poor fuel economy
- Hard starting
- Poor performance
Common Causes
- Wiring problems such as water entry, corrosion, or wire harness damage.
- Faulty fuel temperature sensor B.
- Defective ECM due to issues like water entry or collision damage.
Diagnosis
- Use a digital volt-ohm meter (DVOM) to check the resistance of the fuel temperature sensor B circuit.
- Inspect for bent pins or corrosion in connectors and repair as necessary.
- Shake the wiring harness to induce intermittent faults and test continuity.
- Check reference voltage from ECM and signal voltage from FTS connector.
Fixes
- Repair damaged wiring, replace faulty fuel temperature sensor B or ECM if necessary.
FAQ
What does P0189 mean?
P0189 indicates an intermittent fault in the circuit of fuel temperature sensor B.
How do I diagnose P0189?
Use a DVOM and EWD to check resistance, voltage, and continuity in the FTS circuit and connectors.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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