What Does P2255 Mean?
The PCM detects that the negative current control circuit voltage for Bank 2 Sensor 1 oxygen sensor is below the expected range. This indicates insufficient current flow in the oxygen sensor's pumping cell control circuit.
Common Causes
35%
Shorted to ground in oxygen sensor wiring harness
30%
Failed oxygen sensor with internal short circuit
20%
Corroded or damaged oxygen sensor connector causing low resistance path
10%
PCM internal driver circuit malfunction
5%
Exhaust leak near sensor affecting sensor operation
Diagnostic Steps
1
Step 1: Disconnect Bank 2 Sensor 1 oxygen sensor and check for short to ground in vehicle harness using DVOM
2
Step 2: Inspect oxygen sensor connector terminals for corrosion, bent pins, or moisture
3
Step 3: Measure resistance between negative current control circuit and ground (should be high resistance/open)
4
Step 4: Check for PCM voltage output on control circuit with sensor disconnected
5
Step 5: Replace oxygen sensor if wiring and PCM circuits test normal
Estimated Repair Cost
$200 - $550
Parts + labor, varies by vehicle and location
The PCM detects that the negative current control circuit voltage for Bank 2 Sensor 1 oxygen sensor is below the expected range. This indicates insufficient current flow in the oxygen sensor's pumping cell control circuit.
The most common cause of P2255 (O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1) is: Shorted to ground in oxygen sensor wiring harness
Typical repair costs for P2255 range from $200 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but engine may run rich causing poor fuel economy. Extended driving may damage catalytic converter and spark plugs.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2255 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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