Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)
The exhaust valve control solenoid on Bank 2 isn't working properly, like a stuck valve that won't open or close when it should. This prevents the engine from properly managing exhaust timing and emissions.
The ECU monitors the exhaust valve timing solenoid's electrical response and mechanical performance on Bank 2. It measures solenoid coil resistance, switching response time, and exhaust cam position feedback to confirm proper valve timing. If electrical resistance is out of range or cam timing doesn't respond as expected, the fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Coil Resistance | 5-15 ohms | Open circuit (infinite) or shorted (<1 ohm) |
| Exhaust Cam Timing Response | ±5° crankshaft angle | Deviation >10° or no response |
Code P0029 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0029 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.