LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2011 >> Grand Vitara Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis >> Diagnostic Information and Procedures >> DTC P0037: HO2S Heater Control Circuit Low (Bank-1 Sensor-2); DTC P0038: HO2S Heater Control Circuit High (Bank-1 Sensor-2) >> DTC Detecting Condition and Trouble Area
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detecting Condition and Trouble Area

P0037, P0038 DTC DETECTING CONDITION CHART

DTC detecting condition Trouble area
P0037: HO2S Heater Control Circuit Low (Bank-1 Sensor-2) 
Output voltage of HO2S heater drive circuit is higher than 8.95 V for 5 sec. even if control duty ratio of HO2S heater is lower than 75%.
(2 D/C detection logic)
  • HO2S heater relay
  • HO2S heater and/or its circuit
  • ECM
P0038: HO2S Heater Control Circuit High (Bank-1 Sensor-2) 
Output voltage of HO2S heater drive circuit is lower than 8.95 V for 5 sec. even if control duty ratio of HO2S heater is higher than 25%.
(2 D/C detection logic)
scientia non olet · About LEMON Manuals