Fuel and air

P1522 — Variable Intake Solenoid Circuit Malfunction

Severity: low Safe to drive

What P1522 means

The control module monitors the electrical circuit of the solenoid that operates the intake manifold flaps or valves. This system changes the intake path to boost low-rpm torque and high-rpm power. If the signal or circuit resistance is out of range, the module stores the code and turns on the check engine light. The exact meaning of P1522 varies by manufacturer.

Symptoms

  • Check engine light on
  • Reduced torque at low or high rpm
  • Sluggish acceleration
  • Rough idle
  • Higher fuel consumption

Possible causes

  1. Failed variable intake solenoid
  2. Damaged, shorted or corroded wiring near the intake manifold
  3. Poor connector contact at the solenoid
  4. Low vacuum from cracked or disconnected hoses
  5. Sticking intake manifold flaps or actuator
  6. Rarely, a faulty control module

How to diagnose

  1. Read all codes and freeze frame data, clear the code and see if it returns
  2. Inspect the solenoid connector and harness for damage, corrosion or chafing
  3. Check for power and ground at the solenoid connector
  4. Measure solenoid coil resistance and compare with spec
  5. Test vacuum hoses, check valve and reservoir for leaks
  6. Command the solenoid with a scan tool and confirm it clicks and the flaps move
  7. Check the manifold flaps and linkage for binding
  8. Test the wire from the solenoid to the control module for continuity

Common fixes

  • Replace the variable intake solenoid
  • Repair the wiring harness or connector
  • Replace damaged vacuum hoses and valves
  • Clean or replace the intake flaps and actuator
  • Update software or replace the control module as a last resort

P1522 on different brands

Mazda · manuals
The module detected a short or open circuit in intake manifold air control solenoid 2.
Honda · manuals
The notes list a brake booster pressure sensor circuit with low voltage; this differs from the generic meaning, so confirm in the service information.
Land Rover
The notes describe a communication fault between the engine control module and the ABS module.
Mercedes-Benz · manuals
The notes describe a mechanical fault in camshaft position control, bank 2.
MINI
The notes describe a fault with camshaft position actuator 'A', bank 2.
VAG
The notes describe a malfunction in camshaft position control, bank 2.
Chevrolet · manuals
The notes describe a Park/Neutral to Drive/Reverse at high rpm fault.
Chrysler
The notes describe a Park/Neutral to Drive/Reverse at high rpm fault.

Questions and answers

Can I drive with P1522?

Usually yes, since the engine still runs, but power may drop and fuel use may rise. Get it diagnosed soon to avoid further problems.

What most often causes P1522?

Most often it is the solenoid itself, damaged wiring or a loose connector near the intake manifold, or a vacuum leak in the hoses.

Does P1522 mean the same on every brand?

No. It is a manufacturer-specific code, so the definition depends on the make. Check the documentation for your exact vehicle.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.