P2120 Engine Trouble Code
What is P2120?
The P2120 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Code: | P2120 |
P2120 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
P2120 Code Structure
Understanding what each digit means in the P2120 powertrain trouble code:
| P | 2 | 1 | 2 | 0 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Rail/System Pressure — Too High | Turbocharger Boost Sensor A Circuit Low | Shift Solenoid E Performance or Stuck Off |
How to Fix P2120
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
P2120 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
P2120 Description
P2120 engine trouble code is related to Shift Solenoid E Performance or Stuck Off.
Main Cause
The primary reason for P2120 OBD-II Engine Trouble Code is: Fuel Rail/System Pressure — Too High.