Intake Air Temp Sensor High
The ISUZU-P0113 (Isuzu) diesel fault code means: Intake Air Temp Sensor High. This is a minor severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- intermediate
- Estimated cost
- $200-$2,800
Down with a Isuzu fault on the road?
Get connected with a verified mobile diesel mechanic near you. Verified diesel & reefer techs, launching on the freight corridor.
Find a mobile mechanic →A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Loss of power, sluggish acceleration
- Black smoke under load
- Poor fuel economy
- Irregular idle
- Check Engine Light with possible derate
Probable Causes (Ranked by Likelihood)
- Contaminated MAF sensor from oiled aftermarket filter or soot blow-by Likely
- VGT / VNT actuator carbon-lock on 4HK1 / 6HK1 turbo Likely
- Intake boot or CAC hose leaking near clamp Possible
- EGR valve stuck open leaking soot into intake stream Possible
- Sensor wiring chafe near hot turbo / valve cover Possible
Frequently Asked Questions
What does Isuzu code P0113 mean?
Isuzu diagnostic trouble code P0113 (Intake Air Temp Sensor High) is a minor-severity fault on Isuzu medium-duty diesel engines. It indicates a problem in the air/boost system that should be verified with a scan tool (Isuzu IDSS / Tech2 for Isuzu) before replacing any parts.
Can I drive my Isuzu truck with P0113?
Short runs may be possible but do not ignore — Isuzu medium-duty aftertreatment faults cascade quickly into 5-mph derate or no-restart. Schedule diagnosis immediately.
How much does it cost to fix Isuzu P0113?
Estimated repair cost runs $200-$2,800. Sensor, wiring, and DEF-related repairs fall at the low end; DPF service, turbo, injector, and EGR cooler work fall at the high end and may require dealer-level programming.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Connect IDSS (Isuzu) or Tech2 (GM-badged NPR) and verify P0113 with freeze frame. Compare MAF actual vs calculated airflow at idle and snap-accel.
Inspect intake tract end-to-end for loose clamps, split hoses, and cracked CAC — pressure-test with a smoke machine.
Remove VGT actuator and verify free vane sweep — ACERT-style carbon lock is common on 6HK1 with high idle hours.
Replace MAF only after cleaning first (CRC MAF cleaner); oiled filters coat the wire and create chronic P0101.
If VGT is commanded but boost lags, check for wastegate actuator rod movement and vacuum/electrical feed integrity.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
- SAE J2012Diagnostic Trouble Code Definitions (defines P0113 as a generic OBD-II code)
P0113 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Commonly Affected Vehicles
- Isuzu NPR / NPR-HD with 4HK1 5.2L
- Isuzu NPR-XD / NQR with 4HK1 5.2L
- Isuzu NRR with 4HK1 / 6HK1
- Isuzu FTR / FVR medium-duty with 6HK1 7.8L
- Chevrolet / GMC 4500 / 5500 (Isuzu-chassis) with 4HK1
- Isuzu NPR-ECO-MAX with 3.0L 4JJ1
Explore More
Was this helpful?
Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.