The 1991 Caprice is a body-on-frame workhorse with the 305 TBI being bulletproof but slow, while the rare '91 LT1 brought power and complexity. Transmission cooling failures and optispark woes (LT1 only) are the big budget-busters.
Transmission Oil Cooler Line Failure Leading to Internal Transmission Damage
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink or strawberry-milkshake colored fluid in radiator or transmission, Transmission slipping or refusing to shift, Overheating transmission, Sudden loss of forward gears
Fix: Factory cooler lines rust through where they connect at radiator, cross-contaminating coolant and ATF. Destroys 700-R4/4L60 internals within days. Requires transmission rebuild (8-12 hours) plus radiator flush, new cooler lines, and external cooler installation to prevent repeat. Many shops won't warranty a rebuild without adding external cooler.
Estimated cost: $1,800-3,200
Optispark Distributor Failure (LT1 Engine Only)
Common · high severity
Typical onset: 60,000-90,000 mi
Symptoms: No-start condition with crank but no fire, Severe misfiring and stumbling, Stalling when wet or humid, Check engine light with multiple misfire codes
Fix: The optical distributor sits low behind water pump and gets moisture intrusion or bearing failure. Requires water pump removal to access (design flaw). Budget 6-8 hours labor for optispark replacement, and always replace water pump while you're in there since it's 80% of the labor anyway. Use vented aftermarket unit, not OEM.
Estimated cost: $800-1,400
Intake Manifold Gasket Leaks (TBI 305/350)
Common · medium severity
Typical onset: 100,000-180,000 mi
Symptoms: Coolant weeping from intake valley or front/rear rails, Slight overheating or coolant loss with no external leak, White smoke at startup, Rough idle or misfire if coolant enters cylinders
Fix: The composite intake gaskets deteriorate and leak coolant into valley or externally. Not catastrophic but gets worse. Intake removal on TBI engines is straightforward: 4-6 hours for gasket set, new coolant, and valve cover gaskets while you're there. Use Fel-Pro printed metal gaskets, not OEM paper.
Estimated cost: $450-850
Rear Suspension Trailing Arm Bushing Failure
Common · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Clunking over bumps from rear, Rear axle feels loose or wandering, Uneven rear tire wear, Rear end hops or skips during hard braking
Fix: The rubber trailing arm bushings rot out, allowing rear axle movement. Shows up on NHTSA recalls for this generation. Replacement requires pressing out old bushings and installing polyurethane or rubber replacements. Figure 3-4 hours labor for both sides. Alignment mandatory after.
Estimated cost: $400-700
Fuel Pump Failure (In-Tank Electric)
Occasional · high severity
Typical onset: 120,000-180,000 mi
Symptoms: No-start with crank, no fuel pressure, Stalling at operating temperature, Surging or hesitation under load, Whining noise from fuel tank before failure
Fix: The in-tank pump eventually quits, usually after years of running on low fuel (kills pump life). Tank must be dropped: 2-3 hours labor. Replace pump, strainer, and fuel filter together. Not difficult but time-consuming on the B-body because of exhaust routing and tank straps.
Estimated cost: $350-600
Power Steering Pump and Hose Leaks
Common · low severity
Typical onset: 100,000+ mi
Symptoms: Power steering fluid puddles under front of engine, Groaning or whining when turning, Intermittent heavy steering effort, Burning smell from fluid on exhaust
Fix: High-pressure hose crimp fittings corrode and weep, pump seals leak. The pump itself is bulletproof but seals age out. Hose replacement is 0.5 hour, pump is 1.5-2 hours. Not a breakdown risk but messy and murders belts if ignored. Flush system when replacing pump.
Estimated cost: $250-500
Body Mounts and Frame Rust (Northern Climate)
Occasional · medium severity
Symptoms: Body-to-frame clunking over bumps, Doors misaligning or hard to close, Visible rust perforation at rocker panels or rear frame rails, Body sag or lean at one corner
Fix: The rubber body mounts deteriorate and the frame rusts at rear trailing arm brackets or outriggers in salt states. Body mount replacement is straightforward (lift body, swap mounts, 4-6 hours for all), but frame rust is structural and expensive to repair properly. Inspect thoroughly before purchase.
Estimated cost: $400-900 for mounts; $2,000+ for frame welding
Owner tips
Install an auxiliary transmission cooler immediately — the factory setup is inadequate and will kill your transmission
If buying an LT1 car, budget for optispark and water pump replacement as a package deal
Check frame and floor rust carefully in northern cars — these B-bodies rot from the inside out
Run synthetic ATF (Dexron-VI) in the 700-R4/4L60 and change it every 30k — these transmissions hate heat
Replace intake manifold gaskets with Fel-Pro metal units at first sign of seepage — prevents engine damage
Absolutely buy one if it's a rust-free TBI 305 car with service records — avoid LT1 unless you're handy, and northern cars unless you can inspect the frame with a pick and flashlight.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard on GM B-body platform
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Every control module on the 1991-1996 Chevrolet Caprice — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Electronic Climate Control Programmer (HVAC Programmer)2.5 hr R&Rrelearn only +0.1 hrwith automatic climate control (standard on most trim levels)▸ programming details
📍 behind center of dashboard, above transmission tunnel
🔧 self-calibration via button sequence
⚠️ Controls servo motors for blend doors and mode doors. Self-calibration performed by pressing AUTO and RECIRC simultaneously for 3 seconds after installation.
Electronic Brake Control Module (EBCM)1.8 hr R&Rrelearn only +0.2 hrstandard 1991+ (ABS-VI system)▸ programming details
📍 left front frame rail, ahead of driver wheel well, integrated with hydraulic modulator
🔧 GM Tech 1 for automated bleed procedure
⚠️ Bosch ABS-VI 4-wheel system standard all models. Module and pump assembly are one unit. Requires Tech 1 for proper bleeding and base brake apply test.
Body Control Module (BCM)1.5 hr R&Rdealer / factory tool +0.5 hr1994-1996 (standard)▸ programming details
📍 behind right side of instrument panel, above kick panel
🔧 GM Tech 1 with TIS cartridge
⚠️ Controls interior lighting, door locks, retained accessory power, and communicates with other modules via Class 2. VIN programming required on replacement.
⚠️ 1991-1993 analog cluster stores odometer mechanically; no programming. 1994-1996 electronic odometer requires mileage programming via Tech 1 on replacement.
Transmission Control Module (TCM)1.5 hr R&Rrelearn only +0.3 hr1991+ with 4L60-E automatic transmission▸ programming details
📍 passenger side of transmission tunnel, under carpet near transmission
🔧 drive cycle adaptive relearn
⚠️ Electronic 4-speed overdrive transmission. TCM communicates with PCM via Class 2 data line (1992+). Adaptive shift tables reset on replacement; requires 20-30 mile drive cycle.
🔧 GM Tech 1 with TIS cartridge or PROM replacement
⚠️ 1991-1994 use replaceable PROM chips; 1994-1996 LT1 models began transition to flash programming. VIN and vehicle options must match calibration. All 1991+ models fuel injected.
Selective Ride Control Module (SRC Module)1.2 hr R&Rno coding9C1 police package with optional Selective Ride suspension (rare)
📍 rear cargo area, left side panel behind trim
⚠️ Controls electronically adjustable shock absorbers. Three modes: Touring, Sport, Performance. Communicates with PCM for vehicle speed input.
⚠️ Controls driver airbag (1990-1993) or dual front airbags (1994-1996). Stores crash data and fault codes. Disconnect battery and wait 10 minutes before removal.
Radio / Entertainment System (Radio)0.8 hr R&Rrelearn only +0.1 hr▸ programming details
📍 center of dashboard, in radio opening
🔧 Delco LOC radio code entry via preset buttons
⚠️ Delco radios with Theftlock require 3-digit code entry after battery disconnect or removal. Code on label in glove box or trunk. Non-Theftlock radios require no coding.
Vehicle Anti-Theft System / Pass-Key II Module (VATS / Pass-Key II)relearn only +0.5 hr▸ programming details
📍 integrated in PCM and ignition lock cylinder (no separate module)
🔧 10-minute relearn procedure or resistor bypass
⚠️ Pass-Key II standard all models. Resistor pellet in key read by decoder in steering column; PCM disables fuel if incorrect. Relearn: turn key to ON with wrong/no key for 10 min, OFF, repeat 3 times.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
DOPE, INC. IS RECALLING 42,540 COMBINATION CORNER AND BUMPER LAMP ASSEMBLIES OF VARIOUS PART NUMBERS SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES. THESE HEADLAMPS FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THESE LAMPS DO NOT CONTAIN THE REQUIRED AMBER SIDE REFLECTORS.
Consequence: DECREASED LIGHTING VISIBILITY MAY RESULT IN A VEHICLE CRASH.
Remedy: DOPE, INC. WILL NOTIFY OWNERS AND OFFER A FULL REFUND FOR THE NONCOMPLIANT COMBINATION LAMPS. THE SAFETY RECALL BEGAN ON JULY 28, 2009. OWNERS MAY CONTACT DOPE, INC. AT 1-626-272-1798.
EXTERIOR LIGHTING · 09E012000
2009-04-07
SABERSPORT IS RECALLING 16,270 COMBINATION CORNER AND BUMPER LAMP ASSEMBLIES OF VARIOUS PART NUMBERS SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES. THESE HEADLAMPS FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THESE LAMPS DO NOT CONTAIN THE REQUIRED AMBER SIDE REFLECTORS.
Consequence: DECREASED LIGHTING VISIBILITY MAY RESULT IN A VEHICLE CRASH.
Remedy: SABERSPORT WILL NOTIFY OWNERS AND OFFER A FULL REFUND FOR THE NONCOMPLIANT COMBINATION LAMPS. THE SAFETY RECALL BEGAN ON MAY 11, 2009. OWNERS MAY CONTACT SABERSPORT AT 1-909-598-7589.
EQUIPMENT · 07E088000
2007-10-24
CERTAIN HONEYWELL FRAM RACING BRAND HP4 AND HP8 OIL FILTERS THAT WERE MANUFACTURED FROM MAY 25, 2006, THROUGH SEPTEMBER 14, 2007, AND SOLD FOR USE AS REPLACEMENT EQUIPMENT FOR VEHICLES LIST ABOVE. THE AFFECTED FILTERS ARE MARKED WITH A DATE CODE A61451 THROUGH A72571 SEQUENTIALLY. THE DATE CODE AND PART NUMBER APPEAR ON THE FILTER HOUSING. FRAM RACING HP4 AND HP8 OIL FILTERS NOT BEARING A DATE CODE IN THIS RANGE ARE NOT AFFECTED BY THIS RECALL. THE GASKET OF THE OIL FILTER BECOMES MORE PLIABLE UNDER HIGH TEMPERATURES AND PRESSURES.
Consequence: THIS CONDITION MAY CAUSE INADEQUATE SEALING AND LOSS OF ENGINE OIL, POSSIBLY RESULTING IN A FIRE.
Remedy: HONEYWELL WILL REPLACE THE AFFECTED OIL FILTERS FREE OF CHARGE. THE RECALL BEGAN DURING NOVEMBER 2007. OWNERS CAN CONTACT FRAM CUSTOMER SERVICE TOLL-FREE AT 1-800-890-2075.
EXTERIOR LIGHTING · 06E065000
2006-07-17
CERTAIN AJ MOTORSPORT COMBINATION LAMPS SOLD AS REPLACEMENT LAMPS FOR USE ON THE ABOVE LISTED PASSENGER VEHICLES. COMBINATION LAMPS NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.
Consequence: LACK OF AMBER SIDE REFLECTORS IN THE LAMPS WILL DECREASE LIGHTING VISIBILITY TO OTHER DRIVERS AND MAY POSSIBLY RESULT IN A VEHICLE CRASH.
Remedy: AJ MOTORSPORT WILL NOTIFY OWNERS AND OFFER REIMBURSEMENT FOR THE LAMPS. THE RECALL BEGAN ON JULY 31, 2006. OWNERS MAY CONTACT AJ MOTORSPORT AT 626-618-2026.
EXTERIOR LIGHTING · 06E026000
2006-03-23
CERTAIN PRO-A MOTORS CORNER LAMPS, TURN SIGNALS, AND HEADLIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON CERTAIN PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.
Consequence: WITHOUT THE AMBER REFLECTORS, THE VEHICLE WILL BE POORLY ILLUMINATED, POSSIBLY RESULTING IN A VEHICLE CRASH WITHOUT WARNING.
Remedy: PRO-A MOTORS WILL NOTIFY OWNERS AND OFFER TO REPURCHASE THE LAMPS. THE RECALL BEGAN ON APRIL 3, 2006. OWNERS MAY CONTACT PRO-A MOTORS AT 323-838-2988.
SUSPENSION:REAR · 96V020000
1996-01-31
THE REAR LOWER CONTROL ARM CAN CRACK AT THE REAR STABILIZER BAR ATTACHMENT.
Consequence: THIS CONDITION CAN BE AGGRAVATED BY THE SEVERE DUTY CYCLE OF THESE VEHICLES AND EVENTUALLY CAUSE THE LOWER CONTROL ARM TO FRACTURE COMPLETELY CAUSING A LOSS OF VEHICLE CONTROL WITHOUT PRIOR WARNING.
Remedy: DEALERS WILL REPLACE BOTH REAR LOWER CONTROL ARMS AND REAR STABILIZER BAR ATTACHMENTS.
ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS · 93V018000
1993-02-09
SYSTEM: ELECTRICAL.VEHICLE DESCRIPTION: SEQ 9C1 POLICE CARS IN CORROSION AREAS OF THE US AND CANADA ONLY. NOTE: VEHICLES ORIGINALLY SOLD OR CURRENTLY REGISTERED IN THE STATES OF: CONNECTICUT, ILLINOIS, INDIANA, MAINE, MASSACHUSETTS, MICHIGAN, NEW HAMPSHIRE, NEWJERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, AND WISCONSIN. A ELECTRICAL GROUND-OUT CONDITION MAY EXIST BETWEEN THE 12 VOLT JUNCTION BLOCK AND THE METAL INNER FENDER SKIRT.
Consequence: THIS CONDITION CAN CAUSE A MELTED JUNCTION BLOCK, SMOKE,AND BURNED UNDERHOOD WIRING RESULTING IN A DISABLED VEHICLE OR A VEHICLE FIRE.THIS CONDITION CAN OCCUR WHILE THE VEHICLE IS IN OPERATION OR WHILE THE VEHICLEIS PARKED AND THE IGNITION IS IN THE "OFF" POSITION.
Remedy: INSTALL A SHIELDING INSULATOR UNDER THE JUNCTION BLOCK.
SEAT BELTS · 92V094000
1992-07-01
THE SHOULDER BELT GUIDE LOOP PLASTIC COVERING MAY CRACK AND EXPOSE THE STEEL SUB-PLATE.
Consequence: IN THE EVENT OF A VEHICLE CRASH, THE EXPOSED STEELSUB-PLATE CAN CUT THE SAFETY BELT WEBBING RESULTING IN INCREASED POSSIBILITYAND/OR SEVERITY OF INJURY TO THE AFFECTED SEAT OCCUPANT.
Remedy: INSTALL NEW SHOULDER BELT GUIDE LOOPS.
WHEELS · 92V089000
1992-06-24 · PE92051
THE STEEL WHEELS EXHIBIT FATIGUE CRACKING AROUND THE CIRCUMFERENCE OF THE WHEEL LUG NUT MOUNTING SURFACE DUE TO WHEEL BENDING CAUSED BY FREQUENT MISUSE OF TIRE MOUNTING EQUIPMENT, LUG NUT OVERTORQUING, AND THE UNUSUAL OPERATING CONDITIONS EXPERIENCED BY POLICE VEHICLES.
Consequence: THE CRACKING CAN CAUSE WHEEL FRACTURING AND SUBSEQUENTSEPARATION FROM THE AXLE, WHICH COULD RESULT IN A VEHICLE ACCIDENT.
Remedy: REPLACE THE DEFECTIVE WHEELS WITH REDESIGNED STEEL WHEELS.
LATCHES/LOCKS/LINKAGES:HOOD:LATCH · 91V186000
1991-10-29
SECONDARY HOOD LATCH ASSEMBLIES CAN CORRODE, CAUSING A HIGH LATCH RELEASE EFFORT AND POSSIBLY PREVENTING THE HOOD FROM LATCHING PROPERLY WHEN IT IS CLOSED.
Consequence: IF THE SECONDARY HOOD LATCH IS NOT PROPERLY ENGAGED, ANDTHE PRIMARY HOOD LATCH WAS ALSO NOT ENGAGED, THE HOOD COULD OPEN AND CONTACT THEWINDSHIELD WHILE THE VEHICLE WAS IN MOTION, REDUCING THE FORWARD VISION AREA OFTHE DRIVER AND RESULTING IN A POSSIBLE VEHICLE ACCIDENT WITHOUT PRIOR WARNING.
Remedy: INSTALL A NEW SECONDARY HOOD LATCH ASSEMBLY.
Fuel economy (EPA)
City
15mpg
Highway
24mpg
Combined
18mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Large Cars
Wiper blades
1991-1996 redesigned B-body; larger windshield requires longer blades; sedan has no rear wiper
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1991 Chevrolet Caprice 5.0L V8 305 TBI and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.