The service and repair manual for the 1991 GMC Sonoma — 2.8L V6 and 4.3L V6 and 2.5L I4 engines, 4 trims. Matched to this exact model year, so the specifications and sequences are the ones GMC published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 1991 |
|---|---|
| Engines | 2.8L V6 — OHV 4.3L V6 — OHV 2.5L I4 — 151 cu in, OHV |
| Trims | Base Extended Cab Pickup 2-Door · Base Standard Cab Pickup 2-Door · SLE Extended Cab Pickup 2-Door · SLE Standard Cab Pickup 2-Door |
| Federal record | 2 recalls · 35 complaints · 2 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 1991 Sonoma manual
03 / ContentsSections in the manual
- Quick Lookups 72
- Engine Performance 880
- Accessories & Equipment 182
- General Information 1,523
- Body & Frame 46
- Heating, Ventilation & A/C (HVAC) 194
- Brakes 176
- Maintenance 96
- Drivelines & Axles 83
- Steering 168
- Electrical 186
- Suspension 101
- Engine Mechanical 305
- Transmission 612
- Steering Column Support Bracket 22
- Steering Wheel Retaining Nut 30
- Ignition Switch-To-Column Screws 35
- Lock Cylinder Retaining Screw 22
- Turn Signal Switch Screws 35
04 / Known issuesRecalls on federal record for the 1991 Sonoma
- Service Brakes, Hydraulic — antilock/traction control/electronic limited · 99V193000If this occurred at a time when minimum stopping distance was required, a vehicle crash could occur.
- Fuel System, Gasoline · 06E043000This condition may cause an inadequate seal at the connection, potentially leading to a fuel leak. i.
Owners have filed 35 complaints and GMC has issued 2 technical service bulletins for the 1991 Sonoma. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 1991 Sonoma manual
Is this manual specific to the 1991 Sonoma?
Yes. It is the OEM manual matched to the 1991 model year, covering the 2.8L V6 and 4.3L V6 and 2.5L I4 across the Base Extended Cab Pickup 2-Door, Base Standard Cab Pickup 2-Door, SLE Extended Cab Pickup 2-Door, SLE Standard Cab Pickup 2-Door trims. Specifications and procedure sequences are the ones GMC published for this year.
What 1991 Sonoma problems does it help with?
2 recalls are on federal record for the 1991 Sonoma, covering service brakes, hydraulic, fuel system, gasoline. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by GMC dealers.
Does it include 1991 Sonoma wiring diagrams?
Yes — the complete wiring diagrams for the 1991 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $29.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
RelatedOther Sonoma years and 1991 GMC models
1997 Sonoma · 1996 Sonoma · 1995 Sonoma · 1994 Sonoma · 1993 Sonoma · 1992 Sonoma · all 14 years
1991 GMC B6000 · 1991 GMC C1500 · 1991 GMC C1500 Suburban · 1991 GMC C2500 · 1991 GMC C2500 Suburban · 1991 GMC C3500 · 1991 GMC C3500HD · 1991 GMC C5000 Topkick · 1991 GMC C6000 Topkick · 1991 GMC C7000 Topkick · 1991 GMC G1500 · 1991 GMC G2500 · every 1991 model