REDUCED VEH. RANGE, STATE OF CHARGE GAUGE SWEEPS/SWINGS. Chevrolet S10

SUBJECT: REDUCED VEHICLE RANGE, STATE OF CHARGE GAUGE SWEEPS/SWINGS (REPROGRAM BPCM)

MODELS: 1997-98 CHEVROLET S-10 ELECTRIC TRUCK - WITH VIN H (RPO LN1)

CONDITION:

SOME OWNERS MAY REPORT REDUCED VEHICLE RANGE WITH NO CHANGE IN DRIVING HABITS OR THAT THE STATE OF CHARGE (SOC) GAUGE SWEEPS/SWINGS. DIAGNOSIS MAY REVEAL BPCM DIAGNOSTIC TROUBLE CODE (DTC) 302 IS STORED.

CAUSE:

THE CHARGING STRATEGY DOES NOT ALLOW THE BATTERY PACK TO CHARGE TO 100% EVERY TIME THE VEHICLE IS PLACED ON CHARGE EVEN THOUGH THE CHARGER DISPLAYS FULL - COMPLETE.

BATTERY PACK CONTROL MODULE (BPCM) CALIBRATION FAULT.

CORRECTION:

VERIFY THAT BPCM DTC 311 OR DRIVE MOTOR CONTROL MODULE (DMCM) DTC 104 IS NOT PRESENT. YOU MUST FIRST DIAGNOSE BPCM DTC 311 OR DMCM DTC 104. REFER TO THE APPROPRIATE DTC DIAGNOSTIC INFORMATION.

FOLLOW THE STRATEGY BASED DIAGNOSTICS AND PUBLISHED PROCEDURES FOR THE SPECIFIC SYMPTOM AND DTCS. IF DIAGNOSIS DOES NOT REVEAL A CAUSE, REPROGRAM THE BPCM USING THE FOLLOWING INFORMATION. THE BATTERY PACK P/N IS LOCATED ON THE LEFT SIDE OF THE BATTERY PACK CASE.

LEAD ACID (PBA) BPCM SOFTWARE MODEL BATTERY PACK OLD BPCM NEW BPCM NEW BPCM YEAR ASSY. P/N SOFTWARE ID SOFTWARE ID SOFTWARE P/N 1997 19010530 97050004 97620001 09364989 1998 27004022 98910006 98620001 09360589 1998 27004041 98910021 98620021 09357549

THE NEW SOFTWARE WILL ALLOW 100% CHARGE EVERY TIME THE VEHICLE IS PLACED ON CHARGE. THE NEW SOFTWARE CALIBRATION WILL CAUSE AN INCREASE IN CHARGE TIMES.

IMPORTANT: FOR 1998 TRUCKS, IF A DIFFERENT LEAD ACID BATTERY PACK P/N IS INSTALLED, YOU MUST CONTACT THE TECHLINE CUSTOMER SUPPORT CENTER (TCSC) AT 1-800-828-6860. THE TCSC WILL ISSUE A VCI NUMBER TO PROGRAM THE NEW CALIBRATIONS.

A 1997 BATTERY PACK IS NOT COMPATIBLE TO A 1998 BATTERY PACK. A 1998 BATTERY PACK IS NOT COMPATIBLE TO A 1997 BATTERY PACK.

SERVICE PROCEDURE

WHEN THE REPROGRAMMING PROCESS IS COMPLETE, DO THE FOLLOWING STEPS:

1. TURN OFF THE VEHICLE FOR AT LEAST 60 SECONDS.

2. START THE VEHICLE AND CLEAR THE DTCS IN THE BPCM.

3. PLACE THE VEHICLE ON CHARGE AND VERIFY THAT THE VEHICLE CHARGES UNTIL THE CHARGER DISPLAYS FULL - COMPLETE (UP TO 8 HRS).

THE SERVICE PROGRAMMING SYSTEM (SPS) WILL NOT ALLOW INCORRECT SOFTWARE PROGRAMMING OR INCORRECT CALIBRATION CHANGES. FOR INSTRUCTIONS AND INFORMATION ON THIS PROCEDURE, REFER TO THE LATEST TECHLINE INFORMATION ON REPROGRAMMING OR FLASHING PROCEDURES.

IMPORTANT: THESE NEW CALIBRATIONS ARE NOT AVAILABLE FROM GMSPO. THESE NEW CALIBRATIONS ARE AVAILABLE STARTING WITH 1998 CD ROM DISC #11 AND LATER.

WARRANTY INFORMATION:

FOR VEHICLE REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME J6355 REPROGRAMMING USE PUBLISHED LABOR OPERATION TIME

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 00 ATTACHMENTS: 00

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.