Error code

OBD2 P0044

OBD2P0044
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

HO2S Heater Control Circuit High.

Severity

moderateCan drive, but symptoms may affect performance and fuel efficiency.

Summary

P0044 indicates an issue with the heater control circuit of the heated oxygen sensor (HO2S) 3 on bank 1, which is located after the catalytic converter.

Symptoms

  • Rich-running condition
  • Lean-running condition
  • Increased fuel consumption
  • Loss of power
  • Rough idling
  • Visible black smoke from tail pipe
  • Hard starting in some cases
  • Illuminated CHECK ENGINE light

Common Causes

  • Burnt wiring caused by proximity to hot exhaust components
  • Short circuits due to burnt wiring
  • Corroded or damaged connections
  • Bad ground connections
  • Blown fuses on the heater control circuit

Diagnosis

  1. Perform a visual inspection of all associated wiring and connectors.
  2. Check for reference voltage equal to battery voltage (12.6-13.8 volts).
  3. Inspect the oxygen sensor element for discoloration or deposits.
  4. Test resistance of the sensor, which should be around 8 Ohms.

Fixes

  • Replace damaged wiring and connectors as needed.
  • Check and replace fuses if blown.
  • Inspect and clean or replace the oxygen sensor element.

FAQ

What does P0044 mean?

P0044 indicates a high input voltage issue in the heater control circuit of HO2S 3 on bank 1.

How do I diagnose P0044?

Start with visual inspections and electrical tests to check wiring, connectors, and sensor resistance.

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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