P2C62O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 3
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2C62 points to an open trim circuit at the third oxygen probe of bank 1. Wide-band probes such as Bosch's LSU 4.9 carry a trimming resistor in the connector on a pin of its own (RT/IA) that sets each probe's characteristic; the engine module reads it to scale the pump current, so with the lead broken the signal still moves but with the wrong gain. A third probe sits behind a second catalyst, on diesels typically after the SCR stage. No carmaker documents P2C62 publicly: GM's 3.0L Duramax tables and bulletins use only P2C63, P2C64 and P2C65 for sensor 3. CARB requires circuit continuity checks on oxygen and air-fuel sensors. The front and middle analogues are P2626 and P22B5; low and high faults of this probe are P2C63/P2C64.
- What you may notice
- MIL on, usually without noticeable driving change
- Catalyst or aftertreatment monitors not completing
- Likely causes
- LikelyTrim line broken or terminal pushed back in the probe connector
- PossibleMoisture or corrosion in the connector of the rear probe
- RareTrimming resistor in the probe connector open (probe replacement)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.