C1520 Engine Trouble Code
What is C1520?
With C1520, 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 Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C1520 |
C1520 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
C1520 Code Structure
Understanding what each digit means in the C1520 chassis trouble code:
| C | 1 | 5 | 2 | 0 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Fuel Composition Sensor Circuit Malfunction | Turbocharger Boost Sensor A Circuit Low | Shift Solenoid E Performance or Stuck Off |
How to Fix C1520
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:
Excessive air inflow may result from vacuum leaks, dirty sensors, or EGR valves not closing properly. Insufficient fuel can stem from dirty injectors, clogged filters, weak fuel pump, or leaking pressure regulator.
Technical Notes:
C1520 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
C1520 Description
C1520 engine trouble code is related to Shift Solenoid E Performance or Stuck Off.
Main Cause
The primary reason for C1520 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.