P0028 — Intake valve Control Solenoid Circuit Range/Performance Bank 2

powertrain (engine/transmission)

Is it safe to drive?

Drive cautiously while diagnosing P0028 P0028 can allow the vehicle to run with incorrect Bank 2 intake-valve timing, causing rough operation, low power, misfire, and catalyst damage. Avoid hard acceleration or towing until repaired; stop driving if the Check Engine light flashes, the engine severely misfires, knocks, or overheats.

Typical symptoms

  • Check Engine light illuminates with P0028 stored in the powertrain controller
  • Rough idle, hesitation, or a stumble during acceleration
  • Reduced engine power and increased fuel consumption
  • Slow or abnormal intake-valve response, sometimes heard as a ticking or rattling sound
  • Engine misfire, excessive exhaust odor, or elevated catalytic converter temperature

Common causes

  • Open, shorted, or high-resistance wiring in the Bank 2 intake valve control solenoid circuit
  • Corroded, loose, heat-damaged, or oil-contaminated solenoid connector
  • Failed intake valve control solenoid or internal valve
  • Stuck Bank 2 intake valve control servo, actuator, or oil-control valve
  • Restricted or leaking oil-pressure passage on an oil-actuated intake valve timing system
  • Low engine oil, incorrect oil viscosity, or inadequate engine oil pressure on oil-operated designs

How to diagnose with an OBD scanner

  1. Confirm P0028 and capture operating data Connect an OBD2 scanner such as ELM327 with AIScanAuto, then check stored, pending, and permanent codes. Capture freeze-frame data and monitor Bank 2 intake-valve timing, commanded versus actual position, engine speed, load, and battery voltage when available.
  2. Inspect the Bank 2 solenoid circuit Trace the harness from the intake valve control solenoid to the engine wiring. Look for damaged insulation, chafing, pinching, heat discoloration, corrosion, water intrusion, or loose terminals, especially near the connector and moving engine components.
  3. Perform electrical tests Using service-manual specifications, verify connector pin condition, feed voltage, ground integrity, continuity, and absence of shorts to power or ground. Back-probe the circuit during engine operation to confirm that the control module is commanding the expected solenoid duty cycle.
  4. Check the control mechanism Verify engine oil level, condition, and viscosity where the intake valve control system is oil actuated. Check for restricted passages, leakage, or a stuck control valve. For vacuum-operated designs, inspect the vacuum source, hose, and check valve instead.
  5. Test or replace the suspected component If the wiring and electrical values are correct, isolate the intake valve control solenoid from the Bank 2 servo, actuator, and control passages. Replace only the component proven faulty; internal servo or timing-mechanism wear requires additional inspection before parts are ordered.
  6. Clear and verify the repair Clear P0028 with the scanner, complete the manufacturer drive cycle, and confirm the code does not return. Compare commanded and actual Bank 2 intake-valve timing under light and heavy load to verify that the repair restored proper operation.

Approximate repair cost

Typical independent-shop planning range for P0028 diagnosis and repair is about $150-$1,600. The total depends on whether the fault is a wiring or connector repair, solenoid, control valve, or internal servo or timing assembly. Labor and part availability also affect cost. Figures are estimates and vary by region.

Common questions

Does P0028 always mean the intake valve control solenoid is defective?

No. P0028 covers the Bank 2 solenoid circuit and its range or performance, so wiring, connectors, control pressure, and internal timing components should be tested before the solenoid is condemned.

What should I check first when P0028 is present?

Start with the Bank 2 solenoid connector and wiring, then compare commanded and actual intake-valve timing while checking the control circuit with an OBD2 scanner.

Can I continue driving with P0028?

Short, cautious driving may be possible if the engine runs smoothly, but P0028 can reduce power and increase misfire or catalyst heat. Avoid sustained high load until the fault is corrected.

Will clearing the code repair P0028?

No. Clearing P0028 only resets the stored fault; it will return if the wiring, solenoid, control pressure, or Bank 2 timing mechanism remains defective.

The intake valve control solenoid on Bank 2 is malfunctioning, causing P0028. When the Engine Control Unit detects a problem with the solenoid's circuit—whether it's an electrical fault, short, or mechanical failure—it logs this code. The solenoid controls variable valve timing on the engine's second bank, and when it fails, the ECU can't properly adjust valve timing, leading to performance issues and potential damage if ignored.

The ECU requires the fault to appear multiple times under specific driving conditions before illuminating the check engine light. This deliberate threshold prevents false triggers from temporary glitches. Once triggered, the freeze frame data captures the exact circumstances—engine speed, load, temperature, and vehicle speed—at the moment of failure, providing crucial diagnostic information.

P0028 specifically targets the bank opposite cylinder 1, so locating Bank 2 on your particular engine layout is the essential first step before any testing or replacement work. Without confirming the correct bank, you risk wasting time and money on the wrong side of the engine.

Symptoms of P0028

The Check Engine Light will illuminate when P0028 is stored. Fuel consumption may increase noticeably in some vehicles. The intake valve control system may operate inconsistently or stop functioning entirely. Reduced engine performance or limp-home mode is possible depending on the specific failure. Affected auxiliary systems could be disabled until the fault is resolved.

Common Causes of P0028

A blown fuse in the circuit feeding the intake valve control solenoid is among the most frequent culprits. Open or shorted wiring within the circuit can interrupt proper communication between the ECU and solenoid. The control module driver responsible for operating the solenoid may have failed. A faulty intake valve control solenoid sensor or actuator requires replacement. Corrosion, damage, or loose connections at the electrical connectors can cause intermittent faults.

How to Diagnose P0028

Begin by connecting an OBD2 scanner and confirming P0028 is stored in the ECU memory. Save the freeze frame data immediately—this snapshot shows exactly what engine conditions existed when the fault was detected, guiding your diagnosis toward the root cause. Review any related trouble codes present alongside P0028, as these often point toward the underlying issue rather than the symptom.

Consult manufacturer technical service bulletins for your specific make, model, and year. Many P0xxx codes have documented factory fixes, software updates, or known issues that speed up diagnosis considerably. Search using your VIN on the manufacturer's website or nhtsa.gov for relevant TSBs.

Perform a thorough visual inspection of the wiring harness and connectors associated with the intake valve control solenoid circuit. Look for damaged insulation, corrosion buildup, chafing from contact with other components, or connectors that are not fully seated. Check for burnt or melted wire insulation near heat sources or moving parts.

Use a multimeter to measure reference voltage, ground integrity, and signal continuity at the solenoid connector. Compare your readings against manufacturer specifications. Then conduct a wiggle test on the harness while monitoring live data—the signal should remain stable; any dropouts or interruptions indicate broken wires inside the insulation that are not visible externally.

After repairs, clear the code and complete a full drive cycle that reproduces the conditions recorded in the freeze frame data. Verify P0028 does not return before considering the repair complete.

Repair Options for P0028

Address the least expensive probable causes before replacing major components. Wiring harness or connector repairs typically cost $80–$250 for parts and labor. Replacing a faulty intake valve control solenoid sensor or actuator runs $150–$500 depending on the vehicle and part source. Control module driver repair or replacement is the most expensive scenario, ranging from $300–$1,000.

Total Cost to Fix P0028

Actual repair costs depend entirely on which component failed. Based on independent shop labor rates and typical parts pricing, expect to pay between $80 and $1,000 total. The wide range reflects everything from simple connector repairs to full control module replacement. An accurate diagnosis before purchasing parts is essential—the most expensive fix is rarely the first one to try.

Driving Safety Assessment

P0028 has a short-term severity rating. Most vehicles remain drivable with this code present, though you may notice decreased performance or a disabled auxiliary system. Seek repair at your earliest convenience rather than continuing normal operation indefinitely. If the vehicle exhibits stalling, failure to start, or any warnings related to braking or steering assist, treat the situation as urgent and have it towed to a repair facility immediately.