P0113 Code: Symptoms, Causes, Diagnosis & How to Fix

P0113 indicates that the intake air temperature signal has reached the top of its range, and the module can no longer trust the sensor’s reading of the air entering the engine.

Key Takeaways

• The P0113 code means that the intake air temperature (IAT) sensor circuit is reading high voltage, which the module interprets as impossibly cold air.
• An open circuit is most often caused by a failed sensor, a broken wire, a corroded connector, or a sensor that is simply unplugged.
• The engine usually still runs, but the module reverts to a default temperature setting and often runs rich, which hurts fuel economy and cold starts.
• On many engines, the IAT sensor is located inside the mass airflow (MAF) sensor, which affects both diagnosis and repair costs.
• A five-minute live data check tells you whether the fault is the sensor or the wiring before you spend anything on parts.

What Does the P0113 Code Mean?

The P0113 code reads “Intake Air Temperature Sensor 1 Circuit High Input,” which means the IAT sensor’s signal voltage has remained near the module’s 5-volt reference for longer than the software allows. The sensor is a thermistor whose resistance decreases as the air warms, so a high voltage corresponds to extreme cold. 

When the reading pegs at the top of the scale, the module concludes the circuit is open, stores the code, and substitutes a default temperature so the engine can keep running, a monitoring behavior that federal OBD rules require on every modern vehicle.

Sensor 1 identifies the primary intake temperature sensor, which, on many engines, is built into the MAF housing rather than mounted separately in the intake tract. Turbocharged engines often carry a second sensor after the intercooler, and that one has its own codes. 

The table below shows where P0113 sits within the IAT code family.

Code	Definition	What it usually means
P0110	IAT sensor 1 circuit malfunction	A general electrical fault in the circuit.
P0111	IAT sensor 1 range or performance	The reading is plausible but does not match other data.
P0112	IAT sensor 1 circuit low input	Voltage near zero, usually a shorted sensor or wire.
P0113	IAT sensor 1 circuit high input	Voltage near 5 volts, usually an open circuit.
P0114	IAT sensor 1 circuit intermittent	The signal cuts in and out, usually a wiring fault.

What Causes the P0113 Code?

An open circuit anywhere between the sensor element and the module causes this code, and the list of ways that circuit can open is short. Most of them cost little to fix once found, and the diagnosis below sorts them quickly. We cover each cause in the order it turns up.

Faulty intake air temperature sensor

The thermistor element inside the sensor can fail open due to age, heat cycling, or a physical crack, and an open element presents the same full reference voltage as a cut wire. Standalone IAT sensors are inexpensive and simple, so they fail less often than the wiring around them. 

When the sensor is part of the MAF assembly, the temperature element can fail while the airflow element continues to work, which is why a P0113 sometimes appears with no MAF code beside it.

Damaged or disconnected wiring

The IAT harness runs through the engine bay near the air intake, where heat, vibration, and rodents all reach it. 

A chafed wire that finally breaks, a harness pulled loose during an air filter change, or a connector left unplugged after other work all open the circuit completely. 

Rodent damage warrants a closer look at vehicles that sit for long periods, because the soy-based insulation on many modern harnesses attracts them.

Corroded electrical connector

Corrosion inside the connector builds resistance until the module sees the circuit as open, and it often produces an intermittent code before a permanent one. 

Green or white deposits on the terminals, a hardened connector seal, and terminals that spread loose from repeated unplugging all interrupt the signal. The two-wire IAT connector is small, so a single compromised terminal can render the entire reading invalid.

Intake air leak or sensor contamination

Physical damage around the sensor mounting can stress the sensor body and its wiring until the element or its crimp joints open. 

A cracked intake tube that lets the sensor boss flex, an over-oiled aftermarket air filter that coats the element, or debris strike from a shredded filter can each end the sensor’s life early. 

Contamination more often skews the reading than opens the circuit, but a heavily fouled element does eventually fail outright.

PCM or ECM problems

The powertrain control module supplies the 5 volt reference and reads the signal, so a fault inside it can mimic every symptom of a broken wire. 

Module failures are rare compared with wiring and sensor faults, which is why this cause sits last. 

Suspect the module only when the circuit tests good end-to-end and the reading still pegs high, and check for a software update before condemning the hardware.

What Are the Symptoms of P0113?

The symptoms of P0113 are usually mild because the module substitutes a default air temperature the moment the signal goes out of range. Many drivers notice nothing beyond the warning light, while others see drivability changes that track with weather. 

The three symptoms below account for most complaints.

Check engine light

The light is the most consistent symptom and often the only one. The circuit check runs continuously rather than once per drive cycle, so the code sets quickly after the fault appears and can return within minutes of being cleared if the circuit is still open.

Rough engine performance

A module that believes the intake air is far colder than it really is adds fuel the engine does not need. The result is a rich mixture that can cause a rough or surging idle, hesitation on acceleration, longer crank times on cold mornings, and, in worse cases, black smoke or a fuel smell from the exhaust. 

Engines that rely heavily on the default value may run almost normally, which is why symptoms vary widely between vehicles.

Poor fuel economy

The same enrichment that upsets the idle also burns more fuel across every trip. The loss is usually a modest percentage rather than a dramatic drop, and it persists until the circuit is repaired because the default temperature never matches real conditions. 

Drivers who track their mileage often spot the change before they notice anything else.

How Serious Is the P0113 Code?

This is a moderate problem rather than an emergency, because the engine keeps running on the substituted temperature value. Most owners can drive to a shop or a parts store without drama. 

Leaving it unfixed is a different matter, since a rich mixture washes oil from cylinder walls over time, loads the catalytic converter with unburned fuel, and fails an OBD-II emissions inspection anywhere one is required.

The code also blinds the module to real intake conditions, which matters most in extreme weather. Circuit codes like this one point directly to an electrical fault, unlike efficiency codes such as P20EE that assess how well a whole system performs over time. This directness is good news because the fix is usually cheap once the open point is found.

How to Diagnose the P0113 Code

The diagnosis comes down to answering one question: is the open circuit inside the sensor or in the wiring between it and the module? A scan tool that shows live data answers most of it, and a multimeter finishes the job. The steps below run from fastest to most involved.

Check the IAT sensor and connector

Start with a visual inspection of the sensor and its connector, because an unplugged or visibly broken part ends the diagnosis within minutes. 

Confirm the connector is fully seated and locked, check the sensor body for cracks, and look at the element through the sensor opening for oil fouling or debris. 

If another shop or an air filter change preceded the code, assume something was left disconnected until proven otherwise.

Inspect wiring for damage

Trace the two sensor wires from the connector back along the harness as far as you can reach. 

Look for chafe points where the harness crosses brackets, heat damage near the exhaust side, and chew marks from rodents. 

Flex the harness gently while watching live data, because a reading that jumps during the wiggle test has just told you where the break is.

Check IAT sensor readings

Compare the IAT reading on the scan tool against reality. After the vehicle sits overnight, intake temperature should sit within a few degrees of ambient and roughly match the coolant temperature reading. 

A display showing something like -40 degrees confirms that the module sees an open circuit, which is the classic P0113 signature.

Test sensor resistance and voltage

Unplug the sensor and watch the scan tool; the reading should drop to its coldest possible value. 

Then bridge the two connector terminals with a jumper and watch it swing to its hottest. A circuit that responds to both tests proves the wiring and module are good, leaving the sensor as the failed part. 

Back that up by measuring the sensor’s resistance and comparing it with temperature, using the table below as a rough guide before checking the exact values in the vehicle’s service data.

Air temperature	Approximate resistance
32°F (0°C)	8,000 to 12,000 ohms
50°F (10°C)	5,000 to 8,000 ohms
70°F (21°C)	3,000 to 5,000 ohms
100°F (38°C)	1,500 to 2,500 ohms
200°F (93°C)	200 to 500 ohms

Scan for related trouble codes

Pull every stored and pending code before finishing, because company matters on circuit faults. 

A MAF performance code alongside P0113 points at the shared sensor assembly or its connector, while circuit codes from unrelated systems, such as an ignition coil code like P0352, suggest a chafed harness section or a module problem affecting several circuits at once. A lone P0113 keeps the search local to the sensor and its two wires.

How to Fix the P0113 Code

The fix means closing the open circuit identified in the diagnosis, and each repair below matches one of the causes. Work through them in the same order, since the cheap fixes are also the most common. 

Confirm the live data reading matches ambient temperature after any repair before calling the job done.

Repair damaged wiring

Repair a broken or chafed wire with a soldered or properly crimped splice sealed in heat shrink, and route the repaired section away from heat and the chafe point that caused the damage. 

Replace longer damaged runs rather than stacking splices along them. Tape and twisted connections fail under engine-bay conditions, triggering the code again.

Clean or repair the electrical connector

Clean corroded terminals with electrical contact cleaner and a small brush, then check that each terminal grips a test pin firmly. 

Replace the connector with a pigtail kit when the terminals are spread, broken, or severely corroded, because a compromised terminal will keep triggering intermittent codes no matter how clean it looks. 

Finish with dielectric grease on the seal to keep moisture out.

Replace the IAT sensor

Replace a standalone sensor that failed the resistance test with an OEM or OEM-quality part, since cheap thermistors drift out of specification quickly. 

When the temperature element is inside the MAF sensor, replace the whole assembly, and be careful where the part comes from, because low-cost MAF units are a well-known source of new codes. 

Seat the sensor fully and confirm the reading on live data before closing the hood.

Repair intake system issues

Replace a cracked intake tube that lets the sensor mount flex, and correct whatever contaminated the element. 

This means cleaning out an over-oiled filter situation, replacing a shredded filter that sent debris downstream, and checking that the intake path seals properly around the sensor boss. A clean, stable mounting keeps the new sensor alive.

Address PCM or ECM problems

Have the module tested only after the sensor and circuit have proven good end-to-end. A dealer or a shop with factory tooling can check the reference voltage supply, apply any software updates, and bench-test the input. 

Module replacement requires programming the vehicle, which is why this repair belongs in professional hands rather than in the driveway.

P0113 Chevy: Causes, Diagnosis & Repair

A P0113 Chevy case usually involves the MAF-mounted sensor that GM uses across most of its lineup, which puts the fault at the air intake tube rather than deep in the engine bay. The Silverado, Equinox, and Cruze generate the most reports, and wiring trouble near the air box is the recurring theme across all three.

Common causes on Chevy

The harness section between the air box and the main loom chafes against the bracket on higher-mileage trucks, and rodents can easily reach the same area on vehicles that sit. 

Spread terminals in the MAF connector from repeated filter changes are another frequent finding. The sensor element itself fails less often than its wiring on these engines.

How to diagnose it

Watch the IAT value on live data while wiggling the harness at the air box, because the reading usually jumps at the damaged spot. 

Run the unplug-and-jumper test at the connector to verify the circuit through to the module. 

Check the connector terminals for grip before blaming the sensor.

How to repair it

Repair the chafed section with a sealed splice and reroute it to clear the bracket, or install the GM pigtail kit if the connector is the problem. 

Replace the MAF assembly with an AC Delco or equivalent unit when the temperature element has genuinely failed. 

Confirm the reading tracks ambient temperature afterward.

P0113 Honda: Causes, Diagnosis & Repair

A P0113 Honda complaint varies by age because older engines use a standalone IAT sensor in the intake tube, while newer ones integrate it into the MAF assembly. 

The Accord, Civic, and CR-V lead the reports. Both layouts share the same two-wire circuit, so the same tests apply.

Common causes on Honda

Brittle connector locks that crack during air filter service leave the plug loose enough to lose contact over bumps. Oil from over-oiled aftermarket filters fouls the element in modified cars, and the standalone sensors on older engines eventually fail open due to heat cycling. Wiring damage is less common here than on trucks, but it’s still worth a wiggle test.

How to diagnose it

Confirm the connector locks firmly, then run the live data comparison against ambient temperature after an overnight sit. 

Use the unplug-and-jumper test to isolate the sensor from the circuit. Inspect the element for oil fouling on any car running an oiled filter.

How to repair it

Replace a cracked connector with a pigtail and a failed standalone sensor with an OEM part, which is one of the cheaper fixes in this article. 

Replace the MAF assembly on newer engines when the element has failed. 

Address the filter oiling habit at the same time, or the replacement fouls the same way.

P0113 Nissan: Causes, Diagnosis & Repair

A P0113 Nissan repair usually involves the MAF assembly, because Nissan builds the temperature sensor into it on most engines. The Altima, Rogue, and Sentra account for the bulk of cases. Parts quality matters more on these than on most brands.

Common causes on Nissan

The integrated element fails open within an otherwise working MAF sensor, resulting in a clean P0113 with no airflow code beside it. 

Harness chafe near the intake and corroded terminals from a leaking connector seal cover most of the rest. 

Cheap aftermarket MAF units installed to fix a previous problem cause a noticeable number of repeat codes.

How to diagnose it

Run the unplug-and-jumper test at the MAF connector to verify the wiring before touching the assembly. 

Compare the IAT and coolant readings after an overnight sit, since agreement between them indicates the circuit is clear. 

Check the service history for a recent aftermarket MAF before anything else.

How to repair it

Replace the assembly with a genuine OEM unit rather than the cheapest listing, as these engines are sensitive to off-brand MAF sensors. 

Repair any chafed section of the harness with a sealed splice. Clear the code and verify the reading before returning the vehicle.

P0113 Toyota: Causes, Diagnosis & Repair

A P0113 Toyota case is more likely to be wiring or a connector than the sensor, because the Denso MAF units these engines use are unusually durable. 

The Camry, Corolla, RAV4, and Tacoma appear most often, so it’s worth running the circuit tests before ordering any parts.

Common causes on Toyota

Connector terminals lose tension after years of filter service, and the harness near the air box chafes on trucks that run on rough roads. Rodent damage shows up regularly on Tacomas and RAV4s that park outside. Genuine sensor failures happen, but they sit at the bottom of the list.

How to diagnose it

Wiggle-test the harness while watching live data, and check terminal grip with a test pin before condemning parts. 

Run the unplug-and-jumper test to verify the circuit. A reading that jumps during the flex points to the wiring rather than the sensor.

How to repair it

Repair the wiring or install a pigtail for the connector, which resolves most Toyota cases outright. 

Replace the MAF assembly with a genuine Denso unit on occasions when the element has failed, since imitation units often set new codes, costing more in the end. Confirm the fix on live data afterward.

Resolve P0113 Faster With Identifix Direct-Hit

Diagnosing a two-wire temperature circuit may seem straightforward, and the actual fault is often simple. 

However, the challenge is knowing where each manufacturer places the sensor, which sections of the harness chafe on different models, and whether the repair involves a two-dollar splice or requires replacing the entire MAF assembly. This expertise can mean the difference between quickly finding the issue in 15 minutes and spending an afternoon troubleshooting.

Identifix Direct-Hit puts confirmed fixes, OE service manuals, and interactive wiring diagrams behind a search filter by year, make, and model, so the technician can see which repair actually cleared this code on this vehicle. 

Contact us to see how Direct-Hit handles a P0113 diagnosis on the vehicles your shop sees most.

FAQs

Can P0113 cause starting problems?

Yes, especially in cold weather, because the module calculates cold-start fueling based on a temperature it can no longer read. Depending on the default value the software falls back on, the mixture at crank can be too rich or not rich enough for real conditions, which shows up as long cranking or a stumble in the first seconds of running. 

Warm climates and warm engines mask the problem, which is why the same fault can seem harmless in summer and obvious in January.

Does P0113 affect engine performance?

It can, though the severity varies with how each manufacturer handles the failure. Engines that substitute a moderate default temperature often drive almost normally, while others run rich enough to idle rough, hesitate under acceleration, and lose a noticeable amount of fuel economy. 

Any effect present persists until the circuit is repaired, because the module never regains a real temperature reading on its own.

Can P0113 clear itself?

Yes, once the circuit reads normally again, and the process follows standard OBD-II behavior. Under federal OBD regulations, the module can turn the light off after three consecutive drive cycles without the fault and erase the stored code after roughly 40 warm-up cycles. A code that returns on its own means the open point is still there, and intermittent wiring faults behave exactly this way.

How do I clear the P0113 code?

Fix the circuit first, then clear the code with a scan tool or let it age out on its own. Clearing before the repair accomplishes nothing, because the circuit check runs continuously and resets the code within minutes. 

Skip the old battery disconnect trick, since it wipes the readiness monitors and learned fuel trims along with the code, and the same clearing rules apply to every stored code, whether it is P0113 or an EVAP code such as P0442.

How much does it cost to fix P0113?

The cost ranges from a few dollars for wire and heat-shrink to a few hundred dollars for an MAF assembly. A standalone IAT sensor typically costs 15 to 60 dollars; a connector pigtail is in the same range, plus a modest labor charge; and a MAF assembly with the integrated element runs roughly 80 to 350 dollars, depending on the brand. 

Expect about an hour of diagnostic time, and on newer vehicles, check the EPA emissions warranty before paying out of pocket, since emission-related parts carry 2-year or 24,000-mile coverage against defects.

Is P0113 the same across Ford, Chevy, Honda, Nissan, and Toyota?

The definition is identical everywhere because P0113 is a generic OBD-II code with standardized meaning, but the hardware behind it differs. A P0113 Ford case on an F-150 or Escape usually leads to the MAF integrated sensor and the connector at the air box, much like the GM pattern, while Honda splits between standalone and integrated sensors by engine age. 

The key differences in diagnosing a P0113 code across Ford, Nissan, and Toyota vehicles are the sensor location, the part price, and the specific harness section that often fails. However, the meaning of the code remains consistent across brands. Unrelated codes, such as a knock sensor fault (P0332), have their own diagnosis and are not affected by the manufacturer.