CAT Engine 10113 Fault Code: Crankcase Air Pressure Sensor:Calibration Required
Also called Crankcase Air Pressure Sensor - Calibration Required, Crankcase Air Pressure Sensor : Calibration Required, Crankcase Air Pressure Sensor: Calibration Required, Crankcase Pressure Calibration Required, Crankcase Pressure calibration required
Crankcase Air Pressure Sensor:Calibration Required · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
CAT fault code 10113 (SPN 101 / FMI 13) means the ECM tried to automatically calibrate the crankcase air pressure sensor and could not complete it because the signal voltage was not close enough to the expected reference voltage. It affects C13, C15, C18, C27, and C32 engines and usually points to a wiring, connector, or sensor problem rather than a dangerous mechanical failure by itself.
Medium severity. This code by itself is a calibration and signal-quality problem, not an immediate shutdown event. However, an uncalibrated crankcase pressure sensor means the ECM may not accurately detect real crankcase pressure issues, so it should be diagnosed within the shift rather than ignored long term.
What does CAT Engine error code 10113 mean?
Fault code 10113 is set on CAT engines (C13, C15, C18, C27, C32) when the ECM cannot successfully calibrate the crankcase air pressure sensor. Every pressure sensor on these engines sends a signal voltage that represents the pressure it senses, and the ECM checks that voltage against an internal reference voltage during a key on event of at least two seconds. If the signal is close enough to the reference, the ECM adjusts it automatically, a process called automatic sensor calibration.
If the signal voltage is not close enough to the expected reference, the ECM cannot trust the calibration and sets code 10113 instead. This tells the technician the sensor circuit itself, not necessarily the crankcase pressure condition, is the problem.
Because the crankcase air pressure sensor helps the ECM monitor blow-by and crankcase venting, an uncalibrated sensor reading can mask real engine condition changes. It is worth diagnosing promptly, even though it is not usually an emergency shutdown code.
Common causes of 10113
- Wire seals at the sensor connector not sealed correctly, allowing moisture intrusion
- Damaged, corroded, or loose connectors and connector pins
- Moisture and/or corrosion inside the suspect sensor connector
- Faulty crankcase air pressure sensor
- Sensor port blocked by debris
- Damaged or chafed wiring in the harness, or a general harness problem
- Bad or degraded connector at the sensor
How to troubleshoot CAT Engine 10113: first checks
- With the key off, inspect the crankcase air pressure sensor connector for moisture, corrosion, or loose pins, and check that wire seals are sealed correctly
- Visually inspect the sensor port for blockage or debris that could affect the pressure reading
- Check the wiring harness between the ECM and the sensor for chafing, pinches, or damage along its length
- Disconnect and reconnect the sensor connector to clean and reseat the contacts, then look for corrosion on the terminals
- Confirm there are no other active sensor diagnostic codes present, since a pressure sensor calibration will not complete successfully if there are active codes with an FMI of 03 or 04 on any pressure sensor
- Verify calibration conditions were met: the engine must have been off for at least ten seconds before the ECM attempts automatic calibration, and cranking during the first ten seconds will abort the attempt
How the code clears
No separate manual clearing step is listed for this code. The ECM automatically attempts a pressure sensor calibration whenever it is powered and the engine has been off for at least ten seconds. Once the underlying wiring, connector, or sensor problem is repaired, the next qualifying key on and calibration cycle should allow the ECM to complete calibration successfully and the code should clear on its own. If the pressure reading is outside an acceptable range, or the pressure reading varies significantly during the calibration attempt, the calibration will not be successful and the previous calibration value will be used instead.
Affected models and serial ranges
10113 appears in our records across 5 CAT Engine models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| C13 | Serial range not listed in source records |
| C15 | Serial range not listed in source records |
| C18 | Serial range not listed in source records |
| C27 | Serial range not listed in source records |
| C32 | Serial range not listed in source records |
Frequently asked questions
What does CAT code 10113 mean?
It means the ECM tried to automatically calibrate the crankcase air pressure sensor and the signal voltage was not close enough to the expected reference voltage to complete that calibration. It is a signal and wiring issue, not a direct pressure alarm.
Which CAT engines can show fault code 10113?
This code applies to the C13, C15, C18, C27, and C32 engine models when equipped with a crankcase air pressure sensor monitored by the ECM.
Can I still run the engine with code 10113 active?
The code itself reflects a calibration problem rather than a confirmed dangerous condition, but running with an uncalibrated crankcase pressure sensor means the ECM cannot fully trust that reading. Have it diagnosed within the shift rather than running it indefinitely.
Why won't the crankcase pressure sensor calibrate?
Calibration fails if the pressure reading is outside an acceptable range or if the pressure reading varies significantly during the calibration attempt. It can also fail if there are active sensor diagnostic codes with an FMI of 03 or 04 on any pressure sensor at the time.
Does cranking the engine affect calibration?
Yes. The ECM only attempts automatic calibration after the engine has been off for at least ten seconds. Cranking the engine during that first ten seconds causes the ECM to abort the calibration attempt.
Will fixing the wiring clear code 10113 on its own?
There is no separate manual clearing step listed. Once the wiring, connector, or sensor issue is repaired, the ECM's next automatic calibration attempt during a qualifying key on and engine-off cycle should let the code clear on its own if calibration completes successfully.
What should I check first for code 10113?
Start with the sensor connector: look for moisture, corrosion, and correctly sealed wire seals. Then check the sensor port for debris blockage and inspect the harness wiring for damage before considering sensor replacement.