CAT Engine 17853 Fault Code: Intake Manifold Pressure Sensor : Voltage Above Normal
Also called Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal, Intake Manifold Apresure Sensor : Voltage Above Normal, Intake Manifold Pressure Sensor - Voltage Above Normal, Intake Manifold Pressure Sensor Voltage Above Normal, Intake Manifold Pressure Sensor Voltage High, Intake Manifold Pressure Sensor voltage above normal, Intake Manifold Pressure Sensor voltage high, Intake Manifold Pressure Sensor:Voltage Above Normal
Intake Manifold Pressure Sensor : Voltage Above Normal · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
CAT code 17853 (SPN 3563 / FMI 3) means the ECM sees intake manifold pressure sensor signal voltage above 4.8 VDC to 4.95 VDC for 2 to 8 seconds, which is above the normal operating range. The ECM flags the reading invalid, substitutes a default pressure value, and forces the wastegate solenoid to a default current, which causes poor acceleration until the fault clears.
Medium severity. The engine keeps running but the ECM deliberately limits turbo boost control by defaulting the wastegate solenoid, so you get poor acceleration until this is fixed. It is not an immediate stop-engine event, but ignoring it means reduced power and masked real boost pressure readings, so get it diagnosed the same shift.
What does CAT Engine error code 17853 mean?
This code applies to the intake manifold pressure sensor circuit on CAT C11, C13, C15, C175, C18, C27, and C32 engines. The sensor reports intake manifold (boost) pressure to the ECM so it can manage turbocharger wastegate control and fueling. When the ECM sees the signal voltage climb above the normal range, it assumes the signal circuit has an open or a short to another power source rather than a real pressure reading.
Once the code sets, the ECM stops trusting the sensor. It sets the intake manifold pressure value to a maximum valid pressure briefly, then flags the reading as invalid and substitutes a default pressure value. On engines with an electronically controlled wastegate, the ECM also forces the wastegate solenoid current to a default setting. This protects the turbocharger from overpressure due to potential overspeed, but it comes at the cost of engine acceleration performance.
The sensor works on a shared 5-volt supply circuit: the ECM sends supply voltage to terminal 1, sensor return on terminal 2, and signal on terminal 3 of the connector. The ECM also runs a pull-up voltage on the signal circuit to detect open or short conditions. Voltage above normal on that signal line is read by the ECM as an open circuit condition on this sensor.
What triggers a CAT Engine 17853 code?
The ECM sets this code when it has been powered for 2 seconds and the intake manifold pressure sensor signal voltage stays above 4.8 VDC for at least 8 seconds, or in other described versions above 4.95 VDC for at least 2 seconds. The code will not go active if 262 or 168 codes are currently active on the engine.
Common causes of 17853
- Damaged connectors or wiring at the sensor or ECM harness connector
- Problem with the wiring harness, including corrosion, abrasion, or pinch points
- Short circuit between the sensor harness connector and the ECM, or a short to another power source
- Open circuit in the sensor common (return) wire or in the sensor signal wire between the ECM and sensor
- Sensor supply voltage out of its normal range
- Intermittent fault in the wiring harness or connectors
- Faulty intake manifold pressure sensor
- Faulty ECM
How to troubleshoot CAT Engine 17853: first checks
- Inspect the intake manifold pressure sensor connector and the ECM connector for corrosion, moisture, bent pins, or loose terminals
- Trace the harness between the sensor and ECM looking for chafe points, pinches, or abrasion, especially near moving parts or sharp edges
- Check for continuity and correct resistance in the sensor signal wire and the sensor common wire between the sensor connector and the ECM
- Verify the sensor supply voltage is within its normal range at the sensor connector
- Check for any short to another power source on the signal circuit
- Look for other active codes such as 262 or 168 codes first, since these must be inactive before 17853 can set, and resolving them may be a prerequisite
- If wiring and connectors check out, test or swap the intake manifold pressure sensor to confirm whether it is faulty
How the code clears
No separate clearing step is listed. Once the wiring, connector, or sensor problem causing the above-normal voltage is repaired, the ECM should stop detecting the fault condition and the code will no longer be active. Confirm repair by monitoring the intake manifold pressure sensor voltage with diagnostic software to verify it stays within the normal range during operation.
Affected models and serial ranges
17853 appears in our records across 7 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 |
| C15 | Serial range not listed in source records |
| C175 | 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 17853 mean?
It means the ECM detected that the intake manifold pressure sensor signal voltage went above the normal range, staying above 4.8 to 4.95 VDC for 2 to 8 seconds depending on the specific engine calibration. The ECM treats this as an open circuit or short to another power source on the sensor signal wire.
Will code 17853 stop my engine from running?
No. The engine keeps running, but the ECM substitutes a default intake manifold pressure value and forces the wastegate solenoid to a default current. This is done specifically to prevent turbocharger overpressure from a possible turbo overspeed, but it results in poor acceleration until the fault is fixed.
Why does my engine feel sluggish with this code active?
Because the ECM can no longer trust the real intake manifold pressure reading, it defaults the wastegate solenoid current to a safe setting rather than actively controlling boost. That default setting protects the turbo from overpressure but reduces how well the engine can respond to throttle input.
What should a mechanic check first for 17853?
Start with the sensor and ECM connectors for corrosion or damage, then inspect the wiring harness for chafe, pinch points, or abrasion. Check the sensor supply voltage and look for an open circuit in the signal or common wire, or a short to another power source, before condemning the sensor or ECM.
Is 17853 related to any other CAT fault codes?
Yes. The ECM will not set 17853 as active if 262 or 168 codes are currently active. If either of those codes is present, address them first, since they may be linked to the same sensor supply or circuit issue.
Can a bad ECM cause code 17853?
It's possible but less common. Listed causes include a faulty ECM not reading the signal correctly or not producing correct supply voltage, but wiring, connector, and sensor problems are far more frequent causes and should be ruled out first.
Does this code require an immediate shutdown?
No immediate shutdown is required, but because acceleration performance is reduced and the real intake manifold pressure is unknown while the code is active, it should be diagnosed and repaired promptly rather than left to run indefinitely.