OBD-II trouble code
P22B5: O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 2)
Application matters: Chrysler 25-002-14 explicitly lists P22B5 for specified 2010–2012 Ram 6.7L Cummins ETJ trucks. Bosch’s LSU 4.9 connector trim is a separate component-design example. Use the actual vehicle’s interface, current service instructions and approved repair.
A pumping-current trim circuit/open report for Bank 1 Sensor 2. Identify the actual calibration/interface system before replacing a sensor; a missing connector resistor is only one possible design-specific issue.
Quick facts
- System
- Powertrain
- Category
- Oxygen Sensor
- Severity
- Low severity
- Driving guidance
- Depends on symptoms and vehicle guidance
- Repair cost range
- Get a vehicle-specific estimate after diagnosis.
- DIY difficulty
- Shop recommended
A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.
Part of a family with 26 codes
P22B5 is one of 26 codes covering oxygen sensor 2 control and trim faults. The identifier must be matched to the exact vehicle. Related codes can share a diagnostic approach, but their circuit, failure condition, and required tests can differ.
Browse every code in P2200–P22CA, or start from the full code library.
What does P22B5 mean?
P22B5 names the circuit/open member of the Bank 1 Sensor 2 pumping-current trim group. P22B6 low and P22B7 high are separate conditions. Trim here concerns the sensing system’s calibration/control function, not an independent declaration that the exhaust mixture is rich or lean.
Bosch’s LSU 4.9 is a concrete component example with a trimming resistor in its connector and an appropriate evaluation interface. That design explains why a sensor-specific calibration connector must be respected. It does not prove that every vehicle with P22B5 uses the same resistor, value, connector or service method.
Chrysler 25-002-14 gives a different repair context for the specified 2010–2012 Ram 2500/3500 6.7L Cummins ETJ trucks. It explicitly lists P22B5 and addresses an oxygen-sensor-module overlay harness and verification before component replacement. The code therefore does not automatically condemn a newly fitted part or prove that someone removed a calibration resistor.
Check exact part compatibility, service history and the actual trim function. A permitted harness repair differs from exchanging a calibration connector between sensors. Have diagnosis establish the circuit or assembly fault and required verification before deciding which parts, setup or wiring work belong in an estimate.
Possible causes
- A confirmed connection/circuit fault in the applicable trim function
- A sensing or interface assembly fault established by the manufacturer’s checks
- An incorrect or incompatible service part or altered calibration connection where demonstrated
- The matched vehicle-harness condition addressed by an applicable service bulletin
Symptoms
- An engine/emissions warning with pumping-current trim circuit/open stored
- A calibration/control fault or rejected sensing information
- A report following sensor or wiring work that needs compatibility checks
- Other current-control, reference or heater reports
Diagnostic steps
Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.
- 1.Save the complete manufacturer code, suffix, module, status and failure records.
- 2.Record the exact installed part and recent sensor, connector or harness work.
- 3.Identify how the actual assembly implements trim and which connectors/components are serviceable.
- 4.Have the specified protected trim, connection and interface checks completed; check applicable current bulletin instructions.
- 5.Select the demonstrated wiring, compatible assembly or other repair rather than replacing a part from the generic resistor story.
- 6.Complete setup and prescribed verification. Do not swap sensor calibration connectors, substitute a resistor or assume an arbitrary resistance value.
Repair cost
Get a vehicle-specific estimate after diagnosis.
A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with oxygen sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
These links are planning examples; the code does not confirm that any listed part has failed.
DIY vs shop
A qualified shop is recommended because this can involve manufacturer-grade tooling, training, or certification that most home setups do not have. Ask the technician what testing confirmed the repair.