Spark CVT7 Transmission Replacement

Spark CVT7 Transmission Replacement

Several DTCs may set after replacing the CVT7 transmission (RPO M4M) in some 2014-2015 Spark models. (Fig. 8) The most common codes that may set are P0797 (Pressure Control Solenoid […]

July 22, 2020
Harmonic Balancer Sliding Back on Crankshaft

Harmonic Balancer Sliding Back on Crankshaft

A belt chirp sound or metal-to-metal sound may be heard on some 2019-2020 Silverado HD, Sierra, HD and Silverado 4500HD/5500HD/6500HD models equipped with the 6.6L Duramax diesel engine (RPO L5P, […]

July 22, 2020
Servicing the Front Leveling System

Servicing the Front Leveling System

There may be a Service Front Leveling System message displayed on the Driver Information Center on some 2020 Corvette models. DTC U3000 SYM49 (Control Module Internal Malfunction) also may be […]

July 22, 2020
Inspecting the Dipstick Tube O-Ring and Lower Oil Pan

Inspecting the Dipstick Tube O-Ring and Lower Oil Pan

When diagnosing engine oil leaks on 2019-2020 Silverado, Sierra; and 2020 CT4-V models equipped with the 2.7L turbocharged 4-cylinder engine (RPO L3B) (Fig. 16), inspect the dipstick tube O-ring and […]

July 22, 2020
Check UBEC Bolts for Electrical Concerns

Check UBEC Bolts for Electrical Concerns

Some 2019-2020 Silverado and Sierra models may have any of several electrical-related concerns, including no crank, starter engages after engine start, flickering headlamps, erratic instrument cluster gauges, or high or […]

July 22, 2020
Exhaust Brake Feel During Operation

Exhaust Brake Feel During Operation

The enhanced exhaust brake is one of several improvements in 2020 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P). The exhaust brake feature can be […]

July 22, 2020
Loose Instrument Panel-to-Body Harness Connector

Loose Instrument Panel-to-Body Harness Connector

Some 2020 Encore GX and 2021 Trailblazer models may have several electrical conditions, including no audio from the radio, an inoperative power liftgate (RPO TC2), if equipped, and/or an inoperative […]

July 22, 2020
GM Service Know-How Emerging Issues

GM Service Know-How Emerging Issues

The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM certified repairs. The latest service topics from GM Brand Quality and Engineering covered in […]

July 22, 2020
Repair or Replace? New Program Identifies 9T65 Transmission Replacements

Repair or Replace? New Program Identifies 9T65 Transmission Replacements

A new replacement program for the 9T65 9-speed automatic transmission (RPO M3V, M3W) (Fig.1) on 2018-2020 Enclave, Traverse; 2019-2020 Blazer; 2020 Acadia, XT5, and XT6 models is being piloted in […]

June 29, 2020
Inspection/Maintenance Test DTCs Now Permanent DTCs

Inspection/Maintenance Test DTCs Now Permanent DTCs

Inspection/Maintenance Test DTCs, commonly referred to as Permanent DTCs, are codes that are currently commanding on the Check Engine MIL (Malfunction Indicator Lamp) and are stored in non-volatile memory of […]

June 29, 2020
Run Techline Connect as Admin to Receive Updates Automatically

Run Techline Connect as Admin to Receive Updates Automatically

Techline Connect, GM’s integrated Service Technician Diagnostic Scan Tool application, provides dealership service and parts personnel with access to GDS 2, Service Programming (SPS) and Service Information (SI) from a […]

June 29, 2020
Properly Lifting the Corvette

Properly Lifting the Corvette

Corvette models have required the J-43625 Lift Pad Adapters to properly lift the vehicle since the C5 generation debuted in 1997. The lift pad adapters help ensure proper vehicle weight […]

June 29, 2020
DEF Pump Unable to Build Pressure After Replacement

DEF Pump Unable to Build Pressure After Replacement

After replacing the Diesel Exhaust Fluid (DEF) pump (Fig. 9) on some 2017-2020 Colorado, Cruze, Express, Silverado 1500, Silverado 2500/3500, Canyon, Sierra 1500, Sierra 2500/3500; 2017-2019 Savana; 2018-2019 Equinox, Terrain; […]

June 29, 2020
Engine Oil Pump Pressure Control

Engine Oil Pump Pressure Control

Some 2020 Encore GX and 2021 Trailblazer models equipped with the 1.2L engine (RPO LIH) may have an illuminated Check Engine MIL and DTCs P0521 (Engine Oil Pressure Sensor Performance) […]

June 29, 2020
Quarter Panel Rattle Sound

Quarter Panel Rattle Sound

A rattle or creak sound may be heard coming from the quarter panel area while driving at highway speeds on some 2020 Corvette models. The sound may be due to […]

June 29, 2020
Removal of Corvette Z51 Spoiler

Removal of Corvette Z51 Spoiler

2020 Corvette Stingray models equipped with the Z51 Performance Package feature a rear spoiler that adds downforce to improve high-speed stability. (Fig. 15) If the Z51 spoiler is to be […]

June 29, 2020
Disabling Systems After Pickup Box Removal

Disabling Systems After Pickup Box Removal

A customer may request the pickup box and rear bumper be removed on 2019-2020 Silverado 1500 and Sierra 1500 models to install an aftermarket bed or body. (Fig. 18) If […]

June 29, 2020