P2237moderate severityPowertrain
O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1)
on 2007 Ram 3500 5.9L I6 Cummins · 4WD
What this code means
The PCM detects an open in the positive current control circuit for the upstream O2 sensor on bank 1. This prevents proper air-fuel measurement.
Symptoms
- Check engine light on
- Poor fuel economy
- Rough running engine
Common causes
- Open in O2 sensor pump cell wiring
- Faulty wide-band O2 sensor
- Corroded sensor connector
- PCM control circuit fault
Diagnostic steps
- Scan and record freeze frame data
- Inspect O2 sensor connector and wiring
- Check for open in control circuit
- Replace O2 sensor if wiring is intact
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0005
Fuel Shutoff Valve A Control Circuit/Open
P0006
Fuel Shutoff Valve A Control Circuit Low
P0007
Fuel Shutoff Valve A Control Circuit High
P0008
Engine Position System Performance - Bank 1
P0009
Engine Position System Performance - Bank 2
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1