Error code

OBD2 P0181

OBD2P0181
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Fuel Temperature Sensor A Circuit Range/Performance.

Severity

moderateYes, but expect poor fuel economy and potential performance issues.

Summary

P0181 indicates that the fuel temperature sensor A is not performing within expected parameters, which can affect engine performance and efficiency.

Symptoms

  • Poor fuel economy
  • Hard starting
  • Poor vehicle performance

Common Causes

  • Electrical short circuit or open circuit in wiring
  • Faulty fuel temperature sensor (FTS)
  • Faulty powertrain control module (PCM) due to water entry or collision damage

Diagnosis

  1. Use a digital volt-ohm meter (DVOM) to check the resistance of the FTS circuit
  2. Inspect wiring for corrosion or water damage
  3. Test the FTS directly by comparing its resistance to values in the repair manual

Fixes

  • Replace faulty fuel temperature sensor

FAQ

What should I do if my car has P0181?

Start by checking the wiring and connectors for any signs of damage or corrosion. If no issues are found, consider replacing the fuel temperature sensor.

Can a faulty PCM cause this code?

Yes, water entry or collision damage can affect the PCM, leading to incorrect readings from the FTS.

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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