P35AE

Cylinder 11 Deactivation/Intake Valve Control Circuit

P35AE is a generic OBD-II powertrain diagnostic trouble code: Cylinder 11 Deactivation/Intake Valve Control Circuit. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P35AE
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P35AE means

P35AE is set when the PCM detects an electrical circuit malfunction in the deactivation or intake valve control actuator circuit for cylinder 11. This code applies to large displacement engines with 12 or more cylinders that incorporate cylinder deactivation technology, such as certain V12 and W12 configurations found in premium and commercial vehicle applications.

The diagnostic approach mirrors that of all cylinder-specific deactivation circuit codes: the PCM monitors the commanded versus actual electrical state of the actuator output and triggers P35AE when the circuit falls outside expected parameters for an open, short-to-ground, or short-to-power condition. Cylinder 11 wiring is typically located at the rear of the engine on a V12 layout, which can make access challenging and increases exposure to heat and vibration-related harness wear.

Because P35AE is relatively uncommon, technicians should confirm the engine cylinder count and deactivation pattern before replacing parts. Verify that cylinder 11 is among the cylinders that the system is designed to deactivate, and use electrical diagnostics to isolate the fault to wiring, the solenoid, or the PCM before any disassembly.

Common causes

Most-frequently reported root causes when P35AE is logged.

  • 1
    Open or broken wire in the cylinder 11 deactivation solenoid circuit.
  • 2
    Short to ground in the wiring harness serving cylinder 11.
  • 3
    Short to battery voltage in the cylinder 11 actuator control circuit.
  • 4
    Internal failure of the cylinder 11 deactivation solenoid.
  • 5
    Corroded or damaged connector at the cylinder 11 actuator.
  • 6
    Harness damage from heat or vibration at the rear of the engine.
  • 7
    PCM output driver fault for the cylinder 11 channel.

Symptoms drivers notice

MIL illuminated.
Cylinder deactivation disabled for the affected bank or the entire system.
Reduced fuel economy due to all cylinders remaining active.
No significant change in power output.
Possible companion bank-level deactivation system code.

How to diagnose P35AE

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and freeze frame data; note any companion bank-level or multi-cylinder deactivation codes.
  2. 2
    Confirm the engine configuration and that cylinder 11 is a deactivation cylinder for this platform.
  3. 3
    Locate the cylinder 11 deactivation solenoid and inspect the connector and surrounding harness.
  4. 4
    Measure solenoid coil resistance and compare to specification.
  5. 5
    Check for proper supply voltage and ground at the solenoid connector with the circuit commanded active.
  6. 6
    Trace the wiring harness from cylinder 11 to the PCM for damage, chafing, or connector faults.
  7. 7
    Repair wiring faults or replace the solenoid as indicated by electrical testing.

Related powertrain codes

Frequently asked questions

What vehicles set P35AE?

This code applies to engines with 12 or more cylinders that have cylinder deactivation, such as certain V12 or W12 engines in premium and high-capacity vehicles.

Is the diagnostic process different from other cylinder deactivation codes?

No. The electrical diagnostic process is the same; only the physical location of cylinder 11 and its wiring differ.

Can all deactivation solenoids fail at once?

Multiple solenoid failures at once are unlikely unless a common wiring fault, such as a damaged main harness, is the cause.

Will P35AE affect the engine on a V12 the same way as on a V8?

The principle is the same: the affected cylinder remains active and the deactivation fuel economy benefit is reduced, but the engine continues to operate on all cylinders safely.

Disabling P35AE in software

RaceTune can permanently disable P35AE — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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