Error code

OBD2 P0187

OBD2P0187
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fuel Temperature Sensor B Circuit Low.

Severity

moderateThe vehicle can be driven, but poor performance and reduced fuel economy may occur.

Summary

P0187 indicates that the fuel temperature sensor B is providing an abnormally low input voltage to the ECM, suggesting a higher than normal fuel temperature.

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.
  • ECM failure due to water entry or collision damage.

Diagnosis

  1. Check for proper resistance across the two pins of the ECM connector.
  2. Inspect the wire harness for bent pins or corrosion.
  3. Test the resistance of the fuel temperature sensor B directly and compare it to the repair manual's chart.

Fixes

  • Repair damaged wiring, replace faulty connectors, or replace the fuel temperature sensor.

FAQ

What should I do if my MIL is on and P0187 is set?

You should perform a thorough inspection of the wiring harness and fuel temperature sensor B to identify any damage or corrosion. If issues are found, repair them accordingly.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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