Fuel Gauge - Inaccurate Display
File In Section: 8 - Chassis/Body ElectricalBulletin No.: 63-83-04
Date: March, 1996
Subject:
Inaccurate Fuel Gauge Display
(Install Updated Body Control Module and PROM)
Models:
1996 Cadillac Concours, DeVille, Eldorado, Seville Built Prior to the Following VIN Breakpoints:
Model VIN Breakpoint
Concours/DeVille TU245429
Eldorado TU607684
Seville TU812984
Condition
At key on, some owners may comment on an inaccurate fuel level display. The fuel gauge may show full, then slowly return to the proper level.
Cause
This condition may be caused by a Body Control Module (PZM) miscalibration.
Correction
Install updated Body Control Module (PZM) and PROM, using the following procedure.
Remove or Disconnect
1. Comfort fuse from the trunk compartment fuse block.
2. Rear seat cushion and seat back.
3. Body Control Module (PZM).
Install or Connect
1. Updated PROM into updated Body Control Module (PZM).
2. Body Control Module (PZM).
3. Rear seat back and seat cushion.
4. Comfort fuse in trunk compartment fuse block.
5. Reprogram PZM override PZS33 according to the following values:
E = 6 = Eldorado
K = 4 = Seville
Ksp = 5 = Concours/DeVille
6. Store value:
Hold the front "Defrost" and "Auto/Econ" ("A/C" for analog IPC) for approximately 5 seconds until the display flashes.
7. Cycle ignition.
Parts Information
Description Part Number
Body Control Module (PZM) 16239554
PROM 16238497
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Labor Time
N4800 0.6 hr