What Does P2237 Mean?
The PCM has detected an open circuit in the positive current control path for the upstream oxygen sensor on Bank 1. This indicates the sensor's pumping cell circuit is not functioning properly.
Common Causes
55%
Failed wide-band or air-fuel ratio oxygen sensor with open internal circuit
25%
Broken or disconnected wiring in the sensor harness
12%
Corroded or damaged sensor connector pins causing open circuit
5%
PCM internal driver circuit failure
3%
Blown fuse or open circuit in power supply to sensor
Diagnostic Steps
1
Check all related fuses for O2 sensor heater and control circuits
2
Inspect sensor connector and wiring harness for damage, corrosion, or disconnection
3
Using wiring diagram, backprobe connector and measure voltage/resistance on positive current control circuit
4
Check for proper ground and power supply to sensor per manufacturer specifications
5
If wiring and power are good, replace air-fuel ratio sensor and retest
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit in the positive current control path for the upstream oxygen sensor on Bank 1. This indicates the sensor's pumping cell circuit is not functioning properly.
The most common cause of P2237 (O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1) is: Failed wide-band or air-fuel ratio oxygen sensor with open internal circuit
Typical repair costs for P2237 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but fuel mixture control is compromised. May experience rough idle, poor fuel economy, and increased emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2237 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System and Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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