C1287 — Booster Pedal Force switch circuit Failure

OBD2 code C1287 flags a problem with the turbocharger / supercharger boost control (booster pedal force switch circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: boost leak in intercooler piping or hoses, stuck wastegate or faulty boost control solenoid, faulty boost pressure sensor.

chassis (brakes/steering/suspension)

Is it safe to drive?

Drive with caution Drive gently and avoid boost. The car will likely be down on power and may be in limp mode; ignoring boost faults can overheat the engine and destroy the turbo — a far more expensive repair.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm C1287 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many C0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the turbocharger / supercharger boost control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Pressure-test the intake piping for boost leaks — cracked intercooler hoses are the most common cause.
  5. Subsystem check Command the boost control solenoid with a scanner and verify wastegate movement.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C1287 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C1287 (parts and labor, USD, independent shop rates): Replace boost control solenoid or actuator: $200–$600; Turbocharger replacement: $1,200–$3,500; Repair boost leak (hoses, clamps, intercooler): $100–$400. Overall, fixing C1287 usually costs between $100 and $3,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will C1287 clear itself?

Sometimes C1287 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix C1287?

Replace boost control solenoid or actuator — $200–$600; Turbocharger replacement — $1,200–$3,500; Repair boost leak (hoses, clamps, intercooler) — $100–$400. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose C1287 myself?

Start with a scan: confirm C1287, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the booster pedal force switch circuit, and verify the suspect component against live data before buying parts.

What are the symptoms of C1287?

Drivers most often notice: whistling or siren noise from the engine bay, significant loss of power, black smoke under acceleration, Check Engine Light on.

What is the most common cause of C1287?

The most common causes are: boost leak in intercooler piping or hoses, stuck wastegate or faulty boost control solenoid, faulty boost pressure sensor.

The engine control unit keeps a close eye on how much boost your turbo or supercharger is producing at any given moment. When the pressure readings don't match what the computer expects to see from the booster pedal force switch circuit, it logs trouble code C1287. This specific code falls under the chassis category, which covers braking, steering, and suspension systems along with related drivetrain controls. The official definition you'll see on any scan tool reads "Booster Pedal Force switch circuit Failure."

Your vehicle's boost system relies on precise coordination between the turbocharger, wastegate, control solenoid, and a network of vacuum lines. The ECU expects the pedal position to correlate with a specific boost level. When that relationship breaks down—because of a faulty sensor, a stuck wastegate, or a leak somewhere in the pressurized intake path—the module flags the problem. One thing worth knowing: C1287 won't illuminate your check engine light after a single bad reading. The fault must repeat under defined conditions before the system considers it a genuine failure. That's why the freeze frame data stored alongside C1287 is so useful—it captures engine load, RPM, temperature, and vehicle speed at the exact moment the fault occurred.

When you pull that freeze frame during diagnosis, you're looking at a snapshot of what the engine was doing when the ECU first spotted the mismatch. Replicating those exact conditions during your test drive gives you the best chance of triggering the fault again and confirming your fix worked.

Common symptoms of C1287

  • A high-pitched whistling or siren-like noise coming from the engine bay under load
  • Noticeable reduction in engine power, especially when accelerating
  • Black smoke pouring from the exhaust when you floor the throttle
  • Check Engine Light illuminated on the dashboard
  • Vehicle stuck in limp-home mode, limiting RPM and boost
  • Rough or hesitant acceleration response
  • Increased fuel consumption compared to normal driving

What causes C1287?

  • Faulty or failed boost pressure sensor sending incorrect readings to the ECU
  • Stuck or sluggish wastegate, or a malfunctioning boost control solenoid
  • Worn or damaged turbocharger unable to maintain proper boost levels
  • Boost leak somewhere in the intercooler system, including cracked hoses or loose clamps
  • Damaged vacuum lines or actuator hoses related to boost control
  • Clogged intake ducting or severe exhaust restriction (such as a blocked DPF or catalytic converter)
  • Wiring harness issues—chafed wires, corroded connectors, or poor electrical contact in the boost circuit

How to diagnose C1287

  1. Plug in an OBD2 scanner and confirm C1287 is stored in the ECU memory. Save the freeze frame data immediately—this record shows engine load, RPM, coolant temperature, and vehicle speed at the moment the fault was detected.
  2. Check for any related diagnostic trouble codes. Codes appearing alongside C1287 often point toward the actual root cause rather than the circuit switch itself. Review any available technical service bulletins for your specific make and model—manufacturers occasionally publish software updates or known fixes for persistent boost control issues.
  3. Perform a thorough visual inspection of the wiring harness and connectors tied to the turbocharger and boost control system. Look for damaged insulation, corrosion buildup, chafing from engine movement, or connectors that aren't fully seated.
  4. Pressure-test the intake piping and intercooler system for boost leaks. Inspect all hoses and clamps carefully; a cracked intercooler hose is one of the most frequent culprits behind intermittent boost faults.
  5. Use your scanner to command the boost control solenoid open and closed while monitoring wastegate operation. The wastegate should move freely and respond as expected.
  6. Clear the code, then drive the vehicle through a complete drive cycle that recreates the freeze frame conditions. If C1287 does not return, the repair is confirmed.

How to fix C1287

Address the most common and affordable failures before committing to expensive component replacement:

  • Replace boost control solenoid or actuator — $200–$600
  • Full turbocharger replacement — $1,200–$3,500
  • Repair boost leak including hoses, clamps, or intercooler — $100–$400

How much does it cost to fix C1287?

The total bill hinges entirely on which part failed. Here are typical scenarios for C1287 repairs including parts and labor at independent shop rates in USD:

  • Replace boost control solenoid or actuator: $200–$600
  • Replace turbocharger unit: $1,200–$3,500
  • Repair boost leak (hoses, clamps, intercooler): $100–$400

Across all possible repair paths, fixing C1287 typically ranges from $100 to $3,500. The bulk of cases involve relatively minor issues like a leaking hose or a failing solenoid—both well under $600. Getting an accurate diagnosis before purchasing any parts is the smartest money move, since the worst-case scenario (needing a new turbo) sits at the opposite end of the cost spectrum.

Can you drive with C1287?

The vehicle will run, but drive conservatively and avoid high-boost situations. Expect significantly reduced power and the possibility of limp-home mode activating. Continuing to drive aggressively with an unresolved boost fault risks overheating the engine and causing catastrophic turbocharger damage—a repair that costs far more than addressing the original solenoid or leak.

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