The service and repair manual for the 1988 GMC S15 — 2.8L V6 and 4.3L V6 and 2.5L I4 engines, 9 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 | 1988 |
|---|---|
| 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 · Sierra Classic Extended Cab Pickup 2-Door · Gypsy Extended Cab Pickup 2-Door · High Sierra Standard Cab Pickup 2-Door · Base Cab & Chassis 2-Door +3 |
| Other 1988 S15 variants | S15 Jimmy → |
| Federal record | 2 recalls · 2 complaints · 1 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 1988 S15 manual
03 / ContentsSections in the manual
- Quick Lookups 64
- Engine Performance 869
- Accessories & Equipment 113
- General Information 1,523
- Body & Frame 22
- Heating, Ventilation & A/C (HVAC) 132
- Brakes 85
- Maintenance 53
- Drivelines & Axles 86
- Steering 138
- Electrical 117
- Suspension 37
- Engine Mechanical 253
- Transmission 426
- Steering Wheel Retaining Nut 30
04 / Known issuesRecalls on federal record for the 1988 S15
- Exterior Lighting · 06E049000Without the amber reflectors, the vehicle will be poorly illuminated, possibly resulting in a vehicl.
- Exterior Lighting · 06E026000Without the amber reflectors, the vehicle will be poorly illuminated, possibly resulting in a vehicl.
Owners have filed 2 complaints and GMC has issued 1 technical service bulletins for the 1988 S15. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 1988 S15 manual
Is this manual specific to the 1988 S15?
Yes. It is the OEM manual matched to the 1988 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, Sierra Classic Extended Cab Pickup 2-Door, Gypsy Extended Cab Pickup 2-Door, High Sierra Standard Cab Pickup 2-Door, Base Cab & Chassis 2-Door, Gypsy Standard Cab Pickup 2-Door, High Sierra Extended Cab Pickup 2-Door, Sierra Classic Standard Cab Pickup 2-Door trims. Specifications and procedure sequences are the ones GMC published for this year.
What 1988 S15 problems does it help with?
2 recalls are on federal record for the 1988 S15, covering exterior lighting. 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 1988 S15 wiring diagrams?
Yes — the complete wiring diagrams for the 1988 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 S15 years and 1988 GMC models
1990 S15 · 1989 S15 · 1987 S15 · 1986 S15 · 1985 S15 · 1984 S15 · 1983 S15 · 1982 S15 · all 9 years
1988 GMC Astro · 1988 GMC B6000 · 1988 GMC Brigadier · 1988 GMC C1500 · 1988 GMC C1500 Suburban · 1988 GMC C2500 · 1988 GMC C2500 Suburban · 1988 GMC C3500 · 1988 GMC C5000 · 1988 GMC C6000 · 1988 GMC C7000 · 1988 GMC G1500 · every 1988 model