P0031low severityPowertrain
HO2S Heater Control Circuit Low Bank 1 Sensor 1
on 2003 Dodge Ram 2500 5.7L V8 Hemi · 4WD
What this code means
The voltage in the Bank 1 Sensor 1 O2 heater circuit is lower than expected.
Symptoms
- Check Engine Light
- Extended warmup time
- Poor cold-start emissions
Common causes
- Short to ground in heater circuit
- Faulty O2 sensor
- Corroded connector
Diagnostic steps
- Test heater circuit voltage
- Check for shorts to ground
- Test sensor heater resistance
- Inspect connector
Repair notes
Repair short or replace O2 sensor.
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
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1