P0120 Engine Trouble Code
What is P0120?
With P0120, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Code: | P0120 |
P0120 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
P0120 Code Structure
Understanding what each digit means in the P0120 powertrain trouble code:
| P | 0 | 1 | 2 | 0 |
|---|---|---|---|---|
| Powertrain Code | Intake Valve Control Solenoid Circuit Low | Fuel Rail/System Pressure — Too High | Turbocharger Boost Sensor A Circuit Low | Shift Solenoid E Performance or Stuck Off |
How to Fix P0120
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
P0120 DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
P0120 Description
P0120 OBD-II Trouble Code: The throttle position sensor (
Main Cause
The primary reason for P0120 OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.