P0058 — Ho2S Heater Control Circuit High Bank 2 Sensor 2

Generic OBD-II · all makesPowertrain (engine & transmission)

P0058 means the engine control module has detected an abnormally high voltage condition on the heater control circuit for the downstream oxygen sensor on Bank 2. The sensor heater helps the oxygen sensor reach operating temperature quickly, and a high-voltage reading usually indicates an open or high-resistance heater element, a short to voltage in the wiring, or a connection fault. The malfunction indicator lamp will normally illuminate and the vehicle may fail an emissions test.

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Usually no noticeable drivability change
Possible failed emissions inspection
Slightly longer cold-start enrichment period
Possible minor reduction in fuel economy

What causes it — most likely first

1. Failed Bank 2 Sensor 2 oxygen sensor heater

The heater element inside the downstream oxygen sensor can open, develop high resistance, or short internally, causing the PCM to see a high-voltage condition on the control circuit.

2. Heater control circuit shorted to voltage

The wire between the PCM heater driver and the oxygen sensor may be pinched, chafed, or melted and touching a voltage source, holding the circuit high.

3. Wiring or connector damage and corrosion

Loose, corroded, or damaged terminals in the sensor connector or harness can alter circuit resistance and produce the high-voltage signal that sets the code.

4. Incorrect oxygen sensor installed

A replacement sensor with heater resistance or pin configuration that does not match the application can cause the PCM to report a high heater circuit condition.

5. PCM heater driver or internal fault

Rarely, the PCM's low-side heater driver may fail or misreport the circuit state; this should only be considered after the sensor and all wiring have been thoroughly tested and ruled out.

How it's diagnosed

Visually inspect the Bank 2 Sensor 2 oxygen sensor connector and harness for corrosion, bent pins, chafing, or melted insulation.
Disconnect the sensor and measure heater element resistance across the heater pins; compare the reading to manufacturer specification and replace the sensor if it is open or out of range.
With the sensor and PCM disconnected, check the heater power and control wires for unwanted continuity to battery voltage or ground, and repair any short-to-voltage condition found.
Verify the heater receives battery voltage on the power feed and that the ground/return path is clean; repair supply or ground faults if present.
If the sensor, wiring, and power supply are all correct, monitor the PCM heater driver command; a failed PCM driver is uncommon and should be confirmed before module replacement.
Clear the code and run the OBD-II oxygen sensor heater monitor to confirm the repair.

Code facts & related codes

SystemPowertrain (engine & transmission)

StandardizationSAE generic — identical on every make

Frequently asked

Can I keep driving with P0058?

The vehicle is usually safe to drive, but the downstream catalyst monitor may not run properly, which can cause an emissions test failure and slightly longer cold-start enrichment.

Should I replace the oxygen sensor or check the wiring first?

The sensor heater itself fails most often, but a quick visual inspection and resistance test should be performed before replacement to avoid unnecessary parts replacement.

Do I need a new PCM for P0058?

Usually not. PCM heater driver failure is rare for this code; most P0058 faults are caused by the oxygen sensor heater or a wiring short to voltage. The PCM should be the last component considered after the sensor and circuit have been thoroughly tested.

Can a blown fuse cause P0058?

A blown heater fuse normally causes a low-voltage or open-circuit condition and is more likely to set a 'heater circuit low' code; P0058 is more consistent with a short to voltage or an open/high-resistance heater element.