Oil Pressure Loss (NEED HELP)
Thread Starter
5th Gear
Joined: Jun 2008
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Oil Pressure Loss (NEED HELP)
I have a 2001 C5 that I did heads and cam package on. After taking it out of storage I've noticed something strange. I'm losing oil pressure for about a half a second while driving, it doesn't happen all the time. I have changed the oil switch and now about to change the PCM due to a hard code (1652). Has anyone had this problem? Can someone give me some advice what to do first. Thanks
Melting Slicks
Joined: Aug 2006
Posts: 2,167
Likes: 11
From: Powell TN
Cruise-In VIII Veteran
I have a 2001 C5 that I did heads and cam package on. After taking it out of storage I've noticed something strange. I'm losing oil pressure for about a half a second while driving, it doesn't happen all the time. I have changed the oil switch and now about to change the PCM due to a hard code (1652). Has anyone had this problem? Can someone give me some advice what to do first. Thanks
Is the code above supposed to be P1652? Have you cleared it from the DIC to see if it comes back?
DTC P1652
Circuit Description
The PCM controls the Powertrain Induced Chassis Pitch by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. The driver has a fault line which is monitored by the PCM. When the PCM commands a component ON, the voltage of the control circuit should be low, near 0 volts. When the PCM commands the control circuit to a component OFF, the voltage potential should be a high 5 volts (+/- 0.5 volts). If the fault detection circuit senses a voltage other than what the system expects, the fault line status changes causing the DTC to set.
The PCM receives an 5 volt (+/- 0.5 volt) reference signal from the electronic suspension control (ESC) module on the Powertrain Induced Chassis Pitch circuit. The PCM grounds this circuit when the vehicle accelerates rapidly or brakes hard. When the chassis pitch input circuit goes low to about 0 volts, the ESC module commands all four shock absorber solenoids to a firm position. The PCM calculates the chassis pitch information based on the engine torque and the vehicle braking force.
Conditions for Running the DTC
* Engine speed greater than 400 RPM.
* The system voltage is greater than 6 volts but less than 18 volts.
Conditions for Setting the DTC
* The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match.
* The condition must exist for a minimum of 5.0 seconds.
Action Taken When the DTC Sets
* The PCM stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.
Conditions for Clearing the DTC
* A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
* A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
* Use a scan tool in order to clear the DTC.
Thread Starter
5th Gear
Joined: Jun 2008
Posts: 5
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I had my shop trouble shoot the code and it comes back that the computer needs to be changed. Do you think that's why the oil pressure keeps jumping around?
The oil pressure drops to 0 and then goes back to normal pressure. while driving and at idle. I would have to let off the gas for it to come back up to normal pressure. Any suggestions?
The oil pressure drops to 0 and then goes back to normal pressure. while driving and at idle. I would have to let off the gas for it to come back up to normal pressure. Any suggestions?
Melting Slicks
Joined: Aug 2006
Posts: 2,167
Likes: 11
From: Powell TN
Cruise-In VIII Veteran
1. Pull the code up on the DIC and see if it is a history code or a current code. If it has an h after it, it is a history code, which means it happened at some time, but is not happening now. If it has an HC or C, it is a current code and is currently happening.
2. Reset the codes and see if it comes back.
3. Try the diagnostic approach below.
Here is the diagnostic from the service manual:
Here is the pinouts for the C2 connector:
I would say this is the oil pressure sensor. It is fairly common that they go bad. If you do a search, there is a replacement sensor that goes to a Buick that is much better quality than the replacement for the corvette.
Last edited by 'VETTE PHASE; Jun 29, 2008 at 05:11 PM.
Thread Starter
5th Gear
Joined: Jun 2008
Posts: 5
Likes: 0
the shop tried to clear the code however its a hard code and it won't clear. Next step was to replace the PCM. The oil pressure guage goes to almost 0 pressure; half a second and comes back to normal. This happen at all speeds. Where is the oil pressure sensor located on this vehicle?
Melting Slicks
Joined: Aug 2006
Posts: 2,167
Likes: 11
From: Powell TN
Cruise-In VIII Veteran
Behind the intake on the drivers side. You have a couple of options on how to get to it. Do a search on "oil pressure sensor".
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