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2000 Caprice SS (Holden VT Series 2 SS) with P0327, P0332, P0523, and P1626 Codes - MIL On, Power Hesitation, Hard Shift in 4L60E Transmission

Model: Unknown Fault Code: P0327 Posted: 2012-01-01 23:54

I'm experiencing multiple OBD2 fault codes on my 2000 Chevrolet Caprice SS (rebadged Holden VT Series 2 SS) with an LS1 engine and 4L60E transmission. The current codes are: - P0327: Knock Sensor Circuit Low Voltage - P0332: Knock Sensor 2 Circuit Low Input (Bank 2) - P0523: Engine Oil Pressure Sensor/Switch Circuit High Voltage - P1626: Theft Deterrent Fuel Enable Signal Not Received The Malfunction Indicator Lamp (MIL) is constantly on. The vehicle runs smoothly over long distances, but I occasionally experience power loss during acceleration or hesitation—sometimes the car feels heavy and shakes slightly, especially when stopping. Occasionally, a tuck sound can be heard under the vehicle when accelerating. Additionally, there's a noticeable hard shift from gear 1 to gear 2. I've read that this is a known issue with the 4L60E transmission and may require a specific repair kit. However, I'm unsure which one is correct or if it's still available. I recently shampooed the engine, which may have introduced moisture into the knock sensor connectors—this could explain the P0327 and P0332 codes. The oil pressure sensor issue might be linked to a rear engine leak. I'm also aware that the P1626 code can sometimes occur when the fuel cap door (the small cover over the gas cap) is left open. I've tried clearing the codes, but they return after driving. I'd like to know if replacing the 1-2 accumulator piston spring in the transmission (a relatively inexpensive part) would resolve the hard shifting issue and whether any specific transmission repair kits are recommended for this model.

Related fault codes
P0327P0332P0523P1626
Comments (4)
Anonymous 2012-01-04 23:22

The knock sensors are located under the intake manifold. A common cause of P0327 and P0332 is moisture entering the sensor wiring or connectors due to washing or engine leaks. I've repaired this issue multiple times—often by drying out the connections or sealing them properly. Given that you recently shampooed the engine, it's likely the sensors are wet. Have you cleared all codes and then retested after driving? This helps confirm if the fault is intermittent or related to environmental exposure.

Anonymous 2012-01-05 03:23

Thanks for the insight! I believe I now understand what’s happening. The hard shift from gear 1 to 2 is likely caused by a stuck accumulator piston spring in the transmission. Replacing this part—costs around $10—is a common fix and should resolve the shifting issue. Since I recently shampooed the engine, it's probably saturated the knock sensor connectors, which explains the P0327 and P0332 codes. The oil pressure sensor fault may be due to a leak at the rear of the engine block. Thanks for pointing that out!

Anonymous 2012-01-06 10:36

No problem—please update me on your progress after making repairs. I'm glad I could help, and feel free to ask more questions if needed.

Anonymous 2012-01-07 19:40

P1626 - Theft Deterrent Fuel Enable Signal Not Received I encountered this same code when the small door over the fuel cap was left open. This can interfere with the fuel system's theft deterrent signal. I recommend checking that cover is properly closed and sealed before driving. This might resolve the P1626 issue without any hardware changes. Have a great day! (This is also my first post in this forum.)