P2235 code meaning
O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 2)
Powertrain system Generic code P22xx codes Check engine light
What P2235 means
P2235 concerns the post-catalyst oxygen sensor on bank 2, found on V engines with a catalyst per bank. The ECM sets it when switching off the heater makes the sensor voltage spike. GM runs the check only once the sensor is past its dew-point phase and the modelled exhaust has been above 250 °C for 90 s (and below 800 °C); the failure threshold, as for P2232, is a jump above 2 V within 0.04 s in more than 4 of 6 switch-offs. It appears in the 2005 2.8/3.6 V6 tables, the 2008 3.6 LLT tables and the 2024 set 24OBDG07, each with the MIL after two trips. Because the fault is tied to one sensor position, swapping banks is a quick plausibility check before parts are ordered. P2232 is bank 1, P2234 the front sensor of bank 2.
P2235 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.4 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2235
- Check engine light after two drives
- Bank 2 catalyst monitor not completed
Common causes of P2235
- Most likelyInternal leakage between heater and sensing element of the bank 2 rear sensor
- PossibleSensor wires damaged by heat or chafing near the bank 2 catalyst
- Less likelyWater ingress in the rear sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor2Oxygen sensor heaterOxygen sensor wiring
What each part of P2235 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 35 | The exact fault in that area. |
What to do next
- Note P2235 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2235
What does P2235 mean?
P2235 means "O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 2)". P2235 concerns the post-catalyst oxygen sensor on bank 2, found on V engines with a catalyst per bank. It is a generic code, so it means the same on every make.
Is it safe to drive with P2235?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2235 fail an emissions test?
Yes, it can. P2235 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2235 to fix?
Difficulty: medium. A typical repair takes 0.4 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2235 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.