Error code

OBD2 P0188

OBD2P0188
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fuel Temperature Sensor B Circuit High.

Severity

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

Summary

P0188 indicates that the fuel temperature sensor B is providing an abnormally high voltage signal to the ECM, suggesting a lower than normal fuel temperature reading.

Symptoms

  • Poor fuel economy
  • Hard starting
  • Poor performance

Common Causes

  • Electrical short circuit or open circuit in wiring between the fuel temperature sensor B and the ECM.
  • Faulty fuel temperature sensor B itself.
  • Defective ECM (Engine Control Module).

Diagnosis

  1. Check for proper resistance across the two pins of the ECM connector.
  2. Inspect wiring harness between the ECM and FTS for signs of damage or corrosion.
  3. Test the resistance of the fuel temperature sensor B directly and compare it to specifications in a repair manual.

Fixes

  • Repair damaged wiring or replace faulty fuel temperature sensor B.

FAQ

What should I do if the MIL (Malfunction Indicator Light) is on?

You should perform a diagnostic check to identify the specific trouble code and address any wiring or component issues as described in the troubleshooting steps.

Can this issue cause other problems with my vehicle?

Yes, it can lead to poor fuel economy and reduced engine performance due to incorrect fuel injection timing and quantity calculations by the ECM.

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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