OBD2 Code P0113: Intake Air Temperature (IAT) Sensor Circuit High Input — sensor voltage indicates temperature below -40°C per SAE J1939-71 IAT parameter range
The P0113 code means Intake Air Temperature (IAT) Sensor Circuit High Input — sensor voltage indicates temperature below -40°C per SAE J1939-71 IAT parameter range. Estimated repair cost: $50 – $300.
📋 Diagnostic Reference
| OBD2 Code | P0113 |
| Category | Powertrain |
| Severity | Check Soon |
| Repair Cost | $50 – $300 |
| Can You Drive? | ✅ Yes — diagnose at your convenience |
🔍 Symptoms
- Check Engine Light on
- possible hard starting in cold weather
- decreased fuel economy
- engine may run rich during warmup
- possible transmission shifting issues on some vehicles
⚠️ Most Likely Causes (in order of probability)
- IAT sensor connector unplugged or loose — open circuit reads maximum temperature
- Failed IAT sensor internal thermistor — open circuit condition
- IAT sensor wiring broken or cut — signal wire open
- IAT sensor connector corrosion — high resistance reads as cold temperature
- IAT sensor incorrectly removed during service and not reinstalled
- PCM 5V reference circuit overload — multiple sensors share reference voltage
🛠️ Diagnostic Procedure
Step 1: Locate IAT sensor — typically in intake air duct between air filter and throttle...
Locate IAT sensor — typically in intake air duct between air filter and throttle body, or integrated into MAF sensor housing
Step 2: Check IAT sensor connector for proper seating — most common cause is connector u...
Check IAT sensor connector for proper seating — most common cause is connector unplugged during recent service
Step 3: Measure IAT sensor resistance: should be 2,000-3,000 ohms at 20°C, increases as ...
Measure IAT sensor resistance: should be 2,000-3,000 ohms at 20°C, increases as temperature drops (NTC thermistor per SAE J1939 specification)
Step 4: Test sensor response: heat sensor tip with warm air, resistance should decrease ...
Test sensor response: heat sensor tip with warm air, resistance should decrease smoothly
Step 5: Check IAT sensor wiring for breaks between sensor and PCM
Check IAT sensor wiring for breaks between sensor and PCM
Step 6: If IAT is integrated with MAF sensor: test MAF function separately, may need com...
If IAT is integrated with MAF sensor: test MAF function separately, may need combined MAF/IAT replacement
Step 7: Clear code and verify temperature reading matches ambient: should read within 5°...
Clear code and verify temperature reading matches ambient: should read within 5°C of actual air temperature
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