OBD-II Diagnostic Trouble Code
P0114 — Intake Air Temperature Sensor 1 Circuit Intermittent
P0114 means the IAT 1 signal changed suddenly or dropped out in a way real air temperature could not. The ECM saw an intermittent open or short in the sensor circuit.
Severity 1/5
Truck-relevant
Drive on
Severity
Drive on
Intake Air Temperature Sensor 1 Circuit Intermittent
Code
P0114
Category
Powertrain
Subsystem
Air Flow
Truck-relevant
Yes
What this means for truckers
Low severity on a Cummins X15, Detroit DD15, PACCAR MX-13. The vehicle is safe to drive to your next planned stop. Address at your next regular service.
Before you replace parts — try this first
P0114 on the Air Flow system is most often loose connector or weak terminal tension — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Usually just an intermittent check engine light. You may notice brief stumbles or changes in fan or heater operation when the reading jumps.
Common causes
- CommonLoose connector or weak terminal tension ($30–$200)
- CommonHarness chafing or a broken wire inside the insulation ($80–$350)
- OccasionalIntermittent internal sensor fault ($60–$450)
- OccasionalPoor ground connection ($50–$250)
How to fix
Wiggle-test the IAT harness while watching live data
When to use: First step to reproduce the fault
Clean, tighten and secure the connector and harness
When to use: When movement causes the reading to jump
Check sensor and ECM grounds
When to use: When several temperature sensors show intermittent faults
Replace the IAT sensor
When to use: When the wiring checks good and the fault continues
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P0100 — Mass or Volume Air Flow Circuit
- → P0101 — Mass or Volume Air Flow Circuit Range/Performance
- → P0102 — Mass or Volume Air Flow Circuit Low Input
- → P0103 — Mass or Volume Air Flow Circuit High Input
- → P0104 — Mass or Volume Air Flow Circuit Intermittent
Frequently Asked Questions
Can I drive with code P0114?
Yes — P0114 is severity 1. The vehicle is safe to drive to your next planned stop. Address at your next regular service. The check engine light will stay on until the underlying issue is fixed and the ECM monitors clear.
How much does it cost to fix P0114 on a commercial truck?
Total repair cost ranges $30–$450 depending on the root cause. The cheapest fix is usually the first one listed below — Loose connector or weak terminal tension — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P0114 fail a DOT inspection?
P0114 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between P0114 and related codes?
P0114 is closely related to: P0100 (Mass or Volume Air Flow Circuit), P0101 (Mass or Volume Air Flow Circuit Range/Performance), P0102 (Mass or Volume Air Flow Circuit Low Input), P0103 (Mass or Volume Air Flow Circuit High Input). These codes share the same subsystem (air-flow) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P0114 is set without the companions, the issue is more isolated.
How do I prevent P0114 from coming back after a repair?
For P0114 (Intake Air Temperature Sensor 1 Circuit Intermittent), prevention centers on the air flow system. Service air filter on time. Clean MAF sensor at every air filter change. Inspect intake boots/hoses for cracks — vibration kills them eventually.