Chevy Duramax Repair Service
Chevy HD trucks tow, haul, and idle hard. We keep them working with brand-aware diagnostics, OEM/Genuine GM parts, and clear communication—from Silverado 2500/3500 HD pickups to Silverado 4500/5500/6500 medium-duty cab-and-chassis.
Diagnostics & Common Repairs
Test-first workflow confirms the failure before parts go on.
- Low power/limp & regens: DPF/DEF/SCR, diff-press, NOx/EGT sensors, reductant heaters/lines, dosing tests
- Turbo/air: VGT actuator & vane sticking, CAC/boot leaks, intercooler, MAP/MAF soot loading
- Fuel system: rail pressure & return, balance rates, filter head prime leaks, CP3/CP4/Denso HP pump testing, injector replacement
- Cooling & oiling: thermostats, water pump, radiator/cooling-stack service, fan clutch, EGR & oil cooler integrity
- Electrical/starting: glow plugs & controller, batteries/alternator, voltage-drop & grounds
- Chassis: brakes, hubs/unit bearings, U-joints, steering/suspension, 4×4 engagement
Engines & Platforms We Service
- 6.6L Duramax: LB7, LLY, LBZ, LMM, LML, L5P
- Medium duty: Silverado 4500/5500/6500 with Allison
- Also supported (where equipped): 2.8L LWN in Express and fleet applications
Major Repairs — Engine
- Verification: relative compression/leak-down, balance rates/return flow, rail pressure, boost/CAC smoke test, cooling pressure/flow, oil analysis
- Fuel restorations: CP4 contamination (LML)—tank clean, lines/rails/injectors/pump replaced, system flush; L5P Denso HP pump/injectors; LB7 injector updates with lines
- Turbo & air: VGT service/replace, actuator calibration, CAC/intercooler replacement
- Top-end & gaskets: head gasket strategy, valve train, timing components
- Cooling-stack refresh: radiator/CAC/cond, fan hub/clutch, thermostats, water pump, hoses/surge tank
- Aftertreatment integration: DPF clean/replace, DOC/DEF injector & lines, NOx/EGT calibration
- Validation: hot/cold starts, on-grade road test, leak/boost checks, take-home datalogs
Major Repairs — Transmission
Allison 1000/2000 and 10L1000 behind Duramax.
- Diagnostics: TCM codes, adaptives, line-pressure tests, range switch, harness/grounds, cooler flow & temps
- Service/repair: fluid & filters to spec (TES-295 / Dexron ULV), seals, speed sensors, valve body/solenoids, cooler & lines
- Rebuilds/reman: clutches, steels, torque converter; approved reman when downtime/economics favor a swap
- Calibrations: adaptive reset/learn, shift-quality check, PTO (if equipped)
- Validation: temperature-controlled drive, no-drip recheck, printed specs & next interval
Preventive Maintenance & Fleet Programs
Intervals tuned to towing, altitude, idle hours, and heat. Oil & GM fuel filters, water-separator drains, coolant test/exchange, CAC/boost integrity, axles/transfer case fluids, brake service & fluid, hub/wheel-end torque, batteries/charging, glow-plug tests, tires/TPMS & alignment. Fleet support: priority scheduling, PM calendars, consolidated invoicing, proactive advisories.
BIT/DOT Compliance
Pre-inspection checklist and fast corrections for lighting, brakes, leaks, tires, steering/suspension—plus VIN-level documentation for audits.
Schedule Chevrolet Duramax service with confidence at Britt’s Diesel—brand-savvy diagnostics, durable repairs, and documentation fleets trust.
Local Shop
Skilled Mechanics
Quality Equipment
Benefits of Service
Chevrolet Duramax Service—built for uptime. Test-first diagnostics, GM-spec parts/fluids, and Allison-safe procedures mean fewer surprises, stronger towing, better MPG, longer component life, and lower cost per mile.
- Chevy Duramax-expert diagnostics
- Fast turnarounds / Less downtime
- Quality OEM-spec parts
- BIT/DOT ready
- PM done right
Chevy Duramax Service FAQs
Quick answers about Chevrolet Duramax service at Britt’s Diesel—Silverado 2500/3500 & 4500–6500 HD, LB7–L5P engines, diagnostics, engine/Allison repairs, PM, and fleet/BIT–DOT support.
Silverado 2500/3500 HD pickups and 4500/5500/6500 HD cab-and-chassis. Engines covered: 6.6L Duramax from LB7, LLY, LBZ, LMM, LML to L5P (plus 2.8L LWN where applicable).
A test-first workflow: live data logs, rail-pressure/return, injector balance rates, boost/CAC smoke test, MAP/MAF verification, DPF/DEF/NOx/EGT checks, cooling performance, and 12V voltage-drop/ground testing to find the root cause.
Yes. Engine: CP4 contamination remediation (LML), L5P high-pressure pump/injectors, LB7 injector/line updates, turbo/VGT service, head gaskets, cooling-stack refresh. Transmission: Allison 1000/2000/10-speed diagnostics, spec fluids/filters, valve body/solenoids, rebuilds or reman swaps with adaptive relearn.
GM-spec oil and fuel filters, water-separator drains, coolant test/exchange, CAC/boost integrity checks, axle/transfer-case fluids, brake fluid/pads, hub & wheel-end torque, batteries/charging, glow-plug system, and correct cold PSI/TPMS. Follow severe-duty intervals.
Absolutely—priority scheduling, PM calendars by miles/hours/date, consolidated invoicing, digital service records, and BIT/DOT pre-inspection with fast corrections for lighting, brakes, leaks, steering/suspension, and tires.