CAT Engine 2753 Fault Code: Right Turbo Inlet Pressure open/short to +batt
Also called Right Turbo Inlet Pressure Open/Short to +Batt, Right Turbocharge Inlet Pressure Sensor : Voltage Above Normal, Right Turbocharger Inlet Pressure Sensor : Voltage Above Normal, Right Turbocharger Inlet Pressure Sensor voltage above normal, Turbo In Right Press Open/Short Batt+, Turbo Inlet Right Pressure Open/Short to Batt+
Right Turbo Inlet Pressure open/short to +batt · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
CAT code 2753 sets when the ECM sees the right turbocharger compressor inlet pressure sensor signal above 4.8 volts DC (a short to battery voltage) for a set time after the ECM has been powered up. The ECM flags the reading as invalid, substitutes a default pressure value, and derates engine power.
Medium severity. The engine keeps running but power is reduced and filter restriction detection is disabled while the code is active. Left unaddressed, you lose the air filter restriction warning function and run on a fixed default pressure value, so it should be diagnosed within the shift rather than ignored.
What does CAT Engine error code 2753 mean?
Code 2753 covers the right turbocharger compressor inlet pressure sensor on C11, C13, and C27 engines. This sensor works together with the atmospheric pressure sensor so the ECM can tell whether the air filters are too restricted or something else is blocking air into the turbo compressor inlet.
When the ECM sees the signal voltage go above 4.8 volts DC, it treats that as a short to battery voltage on the signal wire. Since a real sensor reading can never get that high, the ECM knows the data is bad. It flags the turbo compressor inlet pressure (and filter restriction detection) as invalid, and substitutes a default value of 45 kPa (6.5 psi) (some documents list 45 kPa (7 psi), same default idea) so the engine can keep running.
Because the ECM can no longer measure true inlet restriction, it can't confirm whether the air filter is actually plugged. Depending on the version of the logic, the engine may go into a general low power condition or a fixed 20 percent filter-restriction-style derate, and the filter restriction lamp may turn on even though the real restriction is unknown.
What triggers a CAT Engine 2753 code?
The ECM logs 2753 when it reads a right turbo compressor inlet pressure signal voltage above 4.8 volts DC for at least 0.24 seconds (some versions state 1 second) while the ECM has been powered for at least 2 seconds (other versions state 3 seconds). On versions with cross-checks, codes 262-03 (5 volt sensor supply short to +batt) and 262-04 (5 volt sensor supply short to ground) must not be active at the same time for 2753 to set.
Common causes of 2753
- Damaged, corroded, or loose connectors or wiring on the sensor circuit
- Chafed or shorted wiring in the harness between the sensor and the ECM
- Internal leak or internal fault inside the turbo compressor inlet pressure sensor itself
- Incorrect sensor installed in place of the correct part
- Leaks in a vacuum or air hose connected to the sensing point
- Low resistance (a short) between two or more wires in the harness
- Faulty return (ground) wire for the sensor circuit
- Defective ECM (less common, checked only after wiring and sensor are ruled out)
How to troubleshoot CAT Engine 2753: first checks
- Retrieve and confirm the active/logged code and note whether 262-03 or 262-04 (5 volt sensor supply shorts) are also active, since these must be cleared first before 2753 troubleshooting makes sense
- Inspect the sensor connector and ECM connector pins for corrosion, bent pins, moisture, or loose terminals
- Visually trace the harness between the sensor and ECM for chafe points, pinches, or heat damage that could short the signal wire to a battery-voltage source
- Check any vacuum or air hoses near the turbo compressor inlet pressure sensing point for leaks or damage
- With a meter, verify the ECM is supplying 5.0 ± 0.2 volts DC to the sensor and confirm the signal wire is not shorted to a power source elsewhere in the harness
- Confirm the correct sensor part is installed, since an incorrect sensor is listed as a possible cause
- If wiring and sensor both check good, suspect the sensor itself first, then the ECM only after eliminating wiring, connectors, and sensor
How the code clears
No separate clearing step is listed beyond fixing the root cause. Once the wiring, connector, hose, or sensor fault is repaired and the signal voltage returns to a normal operating range, the ECM should stop flagging invalid data on the next power-up cycle. Because the ECM performs automatic sensor calibration during the first seconds after keyswitch ON (as long as the engine is not cranked during that window), cycle the key off and back on without cranking to let the ECM recalibrate the pressure sensors after a repair.
Affected models and serial ranges
2753 appears in our records across 3 CAT Engine models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| C11 | Serial range not listed in source records |
| C13 | Serial range not listed in source records |
| C27 | Serial range not listed in source records |
Frequently asked questions
What does CAT code 2753 mean?
It means the ECM sees the right turbo compressor inlet pressure sensor signal voltage go above 4.8 volts DC, which looks like a short to battery voltage. The ECM can't trust that reading, so it substitutes a default pressure value and limits engine power.
Will code 2753 stop my engine from running?
No, the engine keeps running, but power is reduced. Some documentation describes a 20 percent filter-restriction-style derate, others describe a general low power condition, depending on the engine software version.
Can a bad air filter cause code 2753?
Not directly. A truly plugged air filter causes a pressure difference that triggers a separate filter restriction derate and lamp, but code 2753 itself is about the sensor's electrical signal being invalid (voltage too high), not the actual air filter condition.
What's the first thing a mechanic should check for code 2753?
Start with the connectors and wiring at the sensor and ECM, since damaged or shorted wiring is listed first among possible causes. Also check for any active 262-03 or 262-04 five-volt supply codes, since those affect how 2753 sets.
Does code 2753 affect the air filter restriction warning?
Yes. While active, the ECM flags the turbo compressor inlet pressure as invalid data, which also disables reliable filter restriction detection, since that calculation depends on this sensor's signal.
Is a vacuum or hose leak really a possible cause of a voltage-above-normal code?
Yes, hose or vacuum leaks near the sensing point are listed as a possible cause in some versions of this diagnostic, alongside wiring and sensor faults, so it is worth a quick visual check even though the code is primarily electrical.
How does the ECM calibrate this sensor after a repair?
The ECM automatically calibrates pressure sensors during the first few seconds after the keyswitch is turned ON, as long as the engine is not cranked during that window. Cycling the key without cranking lets a fresh calibration take place after you've fixed the fault.