P0029 — Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2

P0029 — Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

powertrain (engine/transmission)

Is it safe to drive?

Caution - limited driving is acceptable A short trip may be reasonable if the engine runs smoothly and P0029 is not flashing. Avoid extended driving if there is severe misfire, major power loss, loud internal rattling, or another warning-light condition.

Typical symptoms

The check engine light illuminates with P0029 stored in the powertrain system
Engine hesitation or stumble during acceleration
An irregular idle or clicking, chattering, or rattling sound from the exhaust valve area
Reduced engine power and fuel economy, especially when the exhaust valve should open
A flashing check engine light or engine misfire if the affected exhaust valve cannot seat correctly

Common causes

A failed bank 2 exhaust valve control solenoid with an open, shorted, or out-of-calibration internal coil
Open or high-resistance wiring in the solenoid power, ground, or control circuit
Corroded, loose, or heat-damaged electrical connectors near the bank 2 exhaust valve
A short to battery voltage or ground that drives the P0029 control signal outside its expected range
A restricted or leaking vacuum line or defective vacuum actuator on engines using vacuum control
A seized, damaged, or improperly adjusted exhaust valve linkage that restricts commanded valve movement

How to diagnose with an OBD scanner

Verify the code and capture related data Connect an OBD scanner such as ELM327 or AIScanAuto, confirm that P0029 is present, and review freeze-frame and pending codes. If supported, record the commanded and detected exhaust-valve data while comparing the results with a service manual.
Inspect the bank 2 connector and harness With the ignition off, inspect the exhaust valve control solenoid connector and nearby wiring for corrosion, loose terminals, chafing, broken insulation, and heat damage. Repair damaged wiring and clean or replace defective terminals before testing the circuit.
Test the commanded control circuit Use the correct wiring diagram to identify the solenoid pins. Backprobe the specified supply, ground, or control connection while the engine runs and compare the voltage, frequency, or duty-cycle behavior with factory specifications.
Separate solenoid and actuator faults Disconnect the solenoid and check internal continuity or resistance if it is electrically controlled. If it uses vacuum control, inspect the vacuum source, hoses, and actuator travel. Do not substitute a bank 1 component because electrical and vacuum configurations may differ.
Repair and confirm the repair Replace the defective solenoid, actuator, connector, or wiring as testing indicates. Clear P0029 with the scanner, verify valve movement when possible, road-test the vehicle under load, and confirm that the code does not return.

Approximate repair cost

A typical independent-shop estimate for diagnosing and repairing P0029 wiring, connector, or solenoid faults is USD 180-700. A seized valve actuator may increase the cost substantially. These figures are estimates and vary by region, vehicle, and parts availability.

Common questions

What does P0029 mean?

P0029 identifies a bank 2 exhaust valve control solenoid signal or performance fault detected by the powertrain controller.

Is P0029 always caused by a bad solenoid?

No. P0029 can also result from corroded connectors, damaged wiring, a short circuit, a failed vacuum actuator, or a seized valve linkage.

Can I drive with P0029 stored?

Usually, a short trip is acceptable if the engine runs smoothly, but reduced power, flashing codes, severe misfire, or loud internal rattle calls for prompt repair.

Which side of the engine is bank 2?

Bank 2 is the engine-designated exhaust-valve-control bank. Its physical side and cylinder numbers vary by engine, so use the wiring diagram.

When your vehicle's computer detects that the exhaust valve control solenoid on the opposite side of the engine from cylinder one is not performing within factory specifications, it logs OBD2 code P0029. This trouble code falls under the powertrain category, meaning it relates to the engine and transmission control systems rather than body accessories or chassis components. The diagnostic monitor checks this circuit repeatedly during operation, and only after the fault occurs under specific conditions multiple times will the check engine light illuminate. That staged approach prevents false alarms from single glitchy readings.

The "Bank 2" designation refers to the engine bank that does not contain cylinder one. Depending on your engine's orientation—V-shaped or inline—this will be either the left or right cylinder bank. The freeze frame data stored alongside P0029 captures the exact circumstances when the fault was detected, including engine load, RPM, coolant temperature, and vehicle speed. That snapshot proves invaluable during diagnosis because it tells you precisely what driving conditions triggered the code.

Common Symptoms of P0029

The most obvious symptom is an illuminated check engine light. Beyond that, you may notice the affected exhaust valve system behaving erratically or failing to operate entirely. Some vehicles respond by entering a limited-performance limp mode to protect downstream components. Fuel economy often suffers as the engine management system compensates for the malfunctioning actuator. In milder cases, the problem may come and go, making it harder to pin down until conditions repeat.

What Causes P0029?

A handful of issues commonly trigger this code. The most frequent culprit is a weak or interrupted ground connection at the solenoid or its wiring harness. Corroded, loose, or physically damaged connectors also appear regularly, especially on vehicles exposed to road salt or moisture. A blown fuse protecting that specific circuit will obviously prevent proper operation. The control module driver responsible for actuating the solenoid can fail internally. Lastly, the sensor or solenoid actuator itself may simply wear out or suffer internal electrical damage.

How to Diagnose P0029

Begin by connecting a quality OBD2 scanner to verify that P0029 is stored and not a pending code. Record the freeze frame information before clearing anything—this data reveals the operating conditions present when the fault first appeared. Next, scan for any additional trouble codes that might point toward a related cause, such as sensor failures or communication issues. Checking manufacturer technical service bulletins specific to your make, model, and year can save hours of troubleshooting, as some P0029 faults have known factory remedies or software updates.

Perform a thorough visual inspection of the wiring harness and connectors feeding the exhaust valve control solenoid circuit on Bank 2. Look for cracked insulation, wire chafing from contact with hot engine components, green corrosion buildup, or connectors that are not fully seated. At the solenoid connector itself, use a multimeter to verify that reference voltage, good ground, and the control signal are all present and within specification.

A wiggle test while monitoring live data often exposes intermittent wiring problems. Gently manipulate the harness and connectors while watching the scanner's live parameters—if the signal drops out or becomes erratic during movement, you have found a broken wire or loose terminal. After clearing the code, complete a drive cycle that reproduces the conditions captured in the freeze frame, then recheck to confirm P0029 does not return.

Repair Options and Costs

Tackle the cheapest probable causes before committing to expensive component replacements. Wiring harness repair or connector replacement typically runs between eighty and two hundred fifty dollars depending on accessibility and labor time. If the solenoid, sensor, or actuator itself is faulty, parts and installation generally cost one hundred fifty to five hundred dollars. When the problem traces to a failed driver inside the engine control module, repair or replacement ranges from three hundred to one thousand dollars. Overall, expect to spend somewhere between eighty and one thousand dollars to resolve P0029, with the actual figure depending entirely on which component failed and whether professional labor is required.

Can You Drive with P0029?

Most vehicles remain driveable when this code is active, though you may experience reduced performance or certain auxiliary systems becoming unavailable. The car protects itself through limp-mode strategies designed to get you home or to a repair facility. However, if the malfunction causes stalling, prevents starting, or triggers brake and steering warnings, treat the situation as urgent and stop driving immediately.