P1117
CautionIntake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
Is it safe to drive?
🔵 Do not use this page as drive-clearance. Monitor the alert and arrange service if it returns.
What does P1117 mean?
P-code P1117 means "Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage". It is a manufacturer-specific diagnostic trouble code (DTC) in the HVAC / climate control. The intake air temperature (iat) sensor circuit intermittent low voltage signal is absent or intermittent, preventing the control module from monitoring this parameter. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.
Possible Causes
- Sensor has completely failed and produces no output signal
- Disconnected or severely corroded electrical connector
- Broken wire in the signal path between sensor and module
- Control module failure unable to process the incoming signal
Recommended Actions
- 1 Note the alert and schedule a diagnostic appointment when convenient
- 2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside P1117
- 3 Check coolant level, coolant flow, and cooling fan operation
- 4 Inspect the temperature sensor and its wiring for damage or corrosion
- 5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
- 6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement
Related HVAC fault codes
P0112 Intake Air Temperature Circuit Low Input P0113 Intake Air Temperature Circuit High Input P0115 Engine Coolant Temperature Circuit Malfunction P0130 Coolant Thermostat Malfunction P0196 Engine Oil Temperature Sensor Malfunction P0198 Engine Oil Temperature Sensor Low P0199 Engine Oil Temperature Sensor High P0A36 Generator Temperature Sensor Circuit