anybody know,code b0521
Drifting
Joined: Sep 2001
Posts: 1,421
Likes: 3
From: Memphis Tn
Originally Posted by mvvette97
Anybody know what would cause this code. I know it has somthing to do with the tach, but it works fine.
Drifting
Joined: Sep 2001
Posts: 1,421
Likes: 3
From: Memphis Tn
I guess it's a 97'. How old and what kind of battery do you have? Are there any other problems or codes? If you have a Delco battery it could be leaking on you computer below it and causing shorts, it was notorious for this. Otherwise, it's just the 'mischievious Vette Gremlin!"
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 3,394
Likes: 12
From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
Originally Posted by ScreaminDemon
I guess it's a 97'. How old and what kind of battery do you have? Are there any other problems or codes? If you have a Delco battery it could be leaking on you computer below it and causing shorts, it was notorious for this. Otherwise, it's just the 'mischievious Vette Gremlin!"
Racer
Joined: Jul 2002
Posts: 320
Likes: 1
From: Jeffersonville IN
I just pulled this code up on my 98 coupe today. I checked them because it's been idling erratic and sometimes stalling with the AC on.
I cleared them out to see if it will come back. I'll post back if I find anything of interest.
Luke
I cleared them out to see if it will come back. I'll post back if I find anything of interest.
Luke
Former Vendor
Joined: May 2000
Posts: 2,406
Likes: 0
From: Roseville CA
Here you go:
DTC B0521
Circuit Description
The instrument panel cluster (IPC) receives engine RPM information from the powertrain control module (PCM). Engine RPM input information is obtained from the PCM on a dedicated engine speed input to the IPC. The IPC also receives engine RPM data on the serial data line. The PCM is responsible for processing and sending engine RPM data to the IPC. The IPC will only display the engine RPM data that was sent by the PCM. The IPC monitors the engine RPM output information sent from the PCM for an out of range condition.
Conditions for Setting the DTC
The IPC detects that the engine RPM is at least 7,400 RPM.
The above condition must be present for 1 second.
Action Taken When the DTC Sets
The IPC stores a DTC B0521.
The IPC displays engine RPM at 7,400 RPM.
Conditions for Clearing the DTC
The IPC detects that the engine RPM is less than 7,400 RPM.
A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
The code is cleared using on-board diagnostics.
The IPC receives a clear code command from the scan tool.
Diagnostic Aids
The following conditions may cause an intermittent malfunction to occur:
The PCM is unable to process the correct RPM data.
Intermittent or erratic RPM signal sent from the PCM.
For intermittents and poor connections refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Hope this helps. Terry
DTC B0521
Circuit Description
The instrument panel cluster (IPC) receives engine RPM information from the powertrain control module (PCM). Engine RPM input information is obtained from the PCM on a dedicated engine speed input to the IPC. The IPC also receives engine RPM data on the serial data line. The PCM is responsible for processing and sending engine RPM data to the IPC. The IPC will only display the engine RPM data that was sent by the PCM. The IPC monitors the engine RPM output information sent from the PCM for an out of range condition.
Conditions for Setting the DTC
The IPC detects that the engine RPM is at least 7,400 RPM.
The above condition must be present for 1 second.
Action Taken When the DTC Sets
The IPC stores a DTC B0521.
The IPC displays engine RPM at 7,400 RPM.
Conditions for Clearing the DTC
The IPC detects that the engine RPM is less than 7,400 RPM.
A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
The code is cleared using on-board diagnostics.
The IPC receives a clear code command from the scan tool.
Diagnostic Aids
The following conditions may cause an intermittent malfunction to occur:
The PCM is unable to process the correct RPM data.
Intermittent or erratic RPM signal sent from the PCM.
For intermittents and poor connections refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Hope this helps. Terry
