Insufficient Engine Speed Increase During Self Test
Your engine isn't revving up enough during the computer's self-test, similar to a car that won't accelerate properly when you press the gas pedal. The ECU expects the engine speed to increase to a certain level but it's falling short.
During self-test mode, the ECM commands the engine to increase RPM and monitors actual speed via the crankshaft position sensor. If the measured RPM fails to reach the expected threshold within a set time window, this code triggers. The ECU compares the commanded vs. actual engine speed increase.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Engine Speed Increase Rate | Reaches target RPM within 2-3 seconds during self-test | Fails to reach minimum RPM threshold or increases too slowly |
| Target RPM During Self-Test | 1500-2000 RPM target achieved | Below 1200 RPM or stalls during test sequence |
Code P1730 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, P1730 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.