P0113: P0113 Diagnostic Guide

What this code means

P0113 may mean the PCM is seeing the Intake Air Temperature sensor 1 signal higher than expected during its self-check or engine operation.

What the vehicle may do

The vehicle may turn on the malfunction indicator light.
The engine may use a fallback strategy for intake air temperature information.
Driveability may change depending on operating conditions.

Possible fault areas

A possible MAPT sensor circuit concern may be involved.
The MAPT sensor may be involved.
The PCM may be involved after circuit and sensor checks are completed.

Diagnostic path

Opening context

On this 2011 to 2022 F-250 Super Duty with the 6.2L V8, P0113 means the PCM is seeing the Intake Air Temperature sensor 1 signal higher than its self-test maximum. In plain terms, the computer thinks the IAT signal is out of range on the high side. The truck may have drivability changes, may use a backup strategy, or may simply turn the light on depending on when the fault shows up. The broad possible fault areas are the MAPT sensor circuit, the MAPT sensor itself, and, after the circuit and sensor checks are exhausted, the PCM side of the system.

Start with the code path

Start with the basic system checks and confirm P0113 is the code you are chasing. If other codes are present, check what they mean first and do not let a shared code family pull you off the P0113 path. For this fault, the diagnostic route moves into the IAT circuit checks for the MAPT sensor on the 6.2L Super Duty.

Check the IAT and signal return circuits for an open

Next, with the ignition OFF, disconnect the PCM connector. On the F-Series Super Duty 6.2L, disconnect the MAPT sensor connector. Only measure the circuits that apply to the vehicle in front of you. Check resistance from IAT Pin 3 at the MAPT sensor connector to IAT Pin E52 at the PCM connector. Then check resistance from SIGRTN#MAPT Pin 4 at the MAPT sensor connector to SIGRTN#IAT Pin E13 at the PCM connector. Both resistance checks need to be less than 5 ohms. If they are, keep going. If not, repair the open circuit, clear the PCM DTCs, and repeat the self-test.

Check for a short to ground

After the open-circuit check passes, check the IAT circuit for a short to ground. For this 6.2L Super Duty path, the identified test point is IAT Pin 3 at the MAPT sensor connector. The resistance result is judged against greater than 10000 Ω. If the circuit passes, move on to the short-to-voltage check. If it does not pass, repair the short circuit, clear the PCM DTCs, and repeat the self-test. One important caution here: the listed test point identifies the IAT Pin 3 side of this measurement, but it does not identify the other meter lead or reference point, so do not guess at that connection.

Check for a short to voltage

If the short-to-ground check is OK, turn the ignition ON and check the IAT circuit for voltage on the same IAT Pin 3 side at the MAPT sensor connector. The question here is whether any voltage is present. If voltage is present, repair the short circuit, clear the PCM DTCs, and repeat the self-test. If no voltage is present on the P0113 path, continue to the intermittent check. Again, the listed positive lead is IAT Pin 3, but the other meter lead or reference point is not identified, so pause and verify the test setup before making a decision.

Run the intermittent check

Now check for an intermittent connection. Turn the ignition OFF, reconnect the PCM connector, and reconnect the MAPT sensor connector. Turn the ignition ON, access the PCM, and watch the IAT voltage PID. While watching that PID, wiggle, shake, and bend small sections of the harness from the sensor back toward the PCM. Lightly tap the sensor and wiggle the harness connector to simulate road shock. If the IAT PID changes, repair as necessary, reset the keep alive memory, and repeat the self-test. If the PID does not change, keep going.

Command the IAT voltage change

Next is the IAT circuit voltage cycling integrity check. Turn the ignition OFF and disconnect the MAPT sensor connector. Turn the ignition ON, access the PCM, monitor the IAT voltage PID, and record the value. Then connect a 5 amp fused jumper wire using IAT Pin 3 at the MAPT sensor connector as the listed first lead, and record the IAT PID again. The expected change is from greater than 3.0 volts to less than 0.20 volt when the jumper is connected. If that voltage change happens on this 6.2L Super Duty, install a new MAPT sensor, reset the keep alive memory, and repeat the self-test. If the voltage change does not happen, move toward the PCM connector check. The second jumper lead is not identified, so do not assume it; verify that connection before performing the jumper test.

Use the temperature correlation check when routed there

If your diagnostic route puts you at the intake air temperature correlation check, do it before making a PCM decision. Check the temperature values with the engine at ambient temperature. If needed, cold soak the engine for a minimum of 8 hours while it is not in direct sunlight. Turn the ignition OFF, connect the IAT sensor connector, then turn the ignition ON. Access the PCM and monitor the AAT, CHT, ECT, ECT1, and IAT temperature PIDs, understanding that all PIDs may not be available on every vehicle. The temperature readings should be within 17°C (30°F) of each other. If they are within range, continue to the PCM operation check. If they are not, the path calls for a new Intake Air Temperature sensor, then reset keep alive memory and repeat the self-test.

Check PCM connector condition and operation

When the path reaches the PCM operation check, turn the ignition OFF and disconnect all PCM connectors. Inspect for pushed-out pins and corrosion. Then reconnect all PCM connectors and make sure they seat correctly. Recheck whether the concern is still present. If it is still present after that connector inspection and reseating, the path calls for a new Powertrain Control Module with the required programming. If the concern is gone, the system is operating correctly at this time, and the issue may have been caused by a loose or corroded connector.

Verify the repair

Keep verification separate from the circuit testing. After an open-circuit repair, short-circuit repair, intermittent repair, MAPT sensor replacement, IAT sensor replacement, or PCM replacement, clear the PCM DTCs or reset keep alive memory where the path calls for it, then repeat the self-test. The goal is simple: confirm the fault is no longer present and P0113 stays gone.

Takeaway and CTA

The takeaway on P0113 is to stay disciplined: prove the IAT circuit first, stress the harness for an intermittent, use the voltage cycling check, and only then move toward sensor or PCM decisions. For more diagnostic training, visit stepdiagnostics.com.