P0112 on Mercedes-Benz: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0112 specifically affecting Mercedes-Benz vehicles (C-Class, E-Class, S-Class, GLC, GLE).
Select Your Mercedes-Benz Model for P0112:
1. Common Symptoms on Mercedes-Benz Vehicles
When Mercedes-Benz Engine Control Modules (ECM) trigger fault code P0112, drivers typically report:
2. Root Causes on Mercedes-Benz Engines
Historical diagnostic claims across Mercedes-Benz engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Mercedes-Benz
Connect an OBD-II scan tool and record freeze frame sensor telemetry for code P0112 to note engine RPM, load, and voltage when the fault triggered. on Mercedes-Benz engines.
Inspect the electrical connector and wiring harness related to P0112 for chafing, corrosion, moisture, or pin push-out. on Mercedes-Benz engines.
Measure circuit voltage supply (12V B+ or 5V reference) and sensor/actuator resistance according to factory repair manual specifications. on Mercedes-Benz engines.
Install a new OEM-grade replacement part, torque fasteners to factory spec, and ensure electrical locking tabs click firmly. on Mercedes-Benz engines.
Clear all stored DTCs from vehicle memory and perform an OBD-II drive cycle to confirm the diagnostic monitor resets to 'Ready'. on Mercedes-Benz engines.
Equipment for Diagnosing Mercedes-Benz (P0112)
VVT Oil Control Solenoid Valve
Restores accurate camshaft timing and oil pressure regulation on Mercedes-Benz.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. Mercedes-Benz P0112 Frequently Asked Questions
What does code P0112 mean on a Mercedes-Benz?
On Mercedes-Benz vehicles, P0112 indicates that the Engine Control Module (ECM) detected intake air temperature sensor 1 circuit low input. This typically points to IAT sensor shorted to ground or Damaged wiring harness.
Can I continue driving my Mercedes-Benz with code P0112?
Yes. ECM assumes intake air is 280°F+. Because this code carries a Medium severity rating on Mercedes-Benz powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0112 on a Mercedes-Benz?
Estimated DIY parts cost ranges from $80 - $220, while professional shop repairs at an authorized Mercedes-Benz dealership or independent specialist typically range from $180 to $380 including diagnostic labor.