Express 3/4 Ton Van V8-4.8L VIN V (2003)
Electronic Brake Control Module: All Technical Service Bulletins
Electrical - False DTC C0201 Set/Stored in History
File In Section: 05 - Brakes
Bulletin No.: 02-05-25-005
Date: August, 2002
INFORMATION
Subject:
Diagnostic Trouble Code C0201 Set and Stored in History
Models:
2003 Chevrolet Express 2500/3500 Series Vans
2003 Chevrolet Silverado 2500HD/3500HD Series Pickups
2003 GMC Savana 2500/3500 Series Vans
2003 GMC Sierra 2500HD/3500HD Series Pickups with Manual HVAC (RPOs CJ3 or C42)
When the above models require servicing that indicates to check for any diagnostic trouble codes (DTC) in history, please note the following
information. You may find a false DTC 00201 (Open Relay, ABS) stored in history. This code may be stored in error if the blower motor is set in
position 3 or 4 and the ignition is turned OFF. When power is disconnected from the blower motor at key off, the motor begins to coast down. During
this period the motor acts as a generator producing a small amount of electricity. This small voltage is interpreted as an open relay and sets DTC 00201.
On the following key cycle, the relay is energized and passes it's test. The DTC is then shifted to history and the customer never sees an ABS tell tale.
ABS will remain functional at all times.
No attempt should be made to correct this condition. If you encounter DTC 00201 in history, it DOES NOT indicate any need to replace the ABS
module. If however, DTC 00201 is an active code and the I/P tell-tale is illuminated, service is required. Follow the strategy-based diagnostics for DTC
00201 as outlined in the Service Information.
This interaction will be corrected through software changes for the 2004 model year.
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