This service bulletin provides a procedure to add deadener to the batter tray bracket to correct customer concerns of a Service Engine Soon (SES), Reduced Power, Service Brake, Reduced Steering and/or Stabilitrak Message Illuminated on DIC, multiple DTCs.
full bulletin at NHTSA ↗2019 Chevrolet Blazer electrical problems
moderate 35 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
35
Recalls
0
Avg fix
$850
What stands out
Of the 8 model years of Chevrolet Blazer we track for electrical problems, this one carries the most owner complaints on file — 35.
Owners have filed 35 electrical complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
full bulletin at NHTSA ↗This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.
full bulletin at NHTSA ↗The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
full bulletin at NHTSA ↗This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The dominant complaint is the shift-to-park sensor: vehicle won't recognize it's in park even though the shifter clearly is, causing the dashboard to flash "Shift to Park," the doors to lock you out, the engine to refuse shutdown, and the battery to drain as the car stays in auxiliary mode. Owners report needing to jiggle and cycle the shifter between drive, reverse, and park multiple times—sometimes 5–6 attempts—before the error clears. Dealership repairs range from $300 to $668, and several owners say the same failure recurred after being "fixed" once. GM acknowledges the issue in Service Bulletin 19-NA-206 and knew about it since 2016, yet no recall exists.
A secondary electrical issue involves false coolant temperature sensor codes. The actual cause is wiring harness interference where two wires interfere with the sensor signal, but dealers replace the thermostat and sensor—costing $800-plus and solving nothing. One owner spent $15,000 chasing a fuel stumble that happens every time the tank is topped off, with multiple dealers unable to help. A third owner experienced total electrical shutdown while driving—loss of steering assist and brake power mid-traffic—yet the dealer missed diagnostic codes and misdiagnosed the battery.
Same Chevrolet Blazer electrical reports on nearby years: 2020 · 2021
Failure modes owners describe
Shift to Park sensor malfunction
The transmission position sensor or switch fails to recognize the vehicle is in park, causing the instrument cluster to display 'Shift to Park' error even when the shifter is physically set to park. The vehicle will not turn off, remain in auxiliary power mode, and the doors will not lock until the error clears.
When: Can occur within first year of ownership through later years; one owner reported recurring issue after previous repair at 12,350 miles; another at 35,700 miles; many report it happening sporadically over multiple months or years
Symptoms owners cite: Dashboard displays 'Shift to Park' message while vehicle is in park; Vehicle will not shut off completely; Doors will not lock; Constant dinging/warning chime; Vehicle stays in auxiliary mode; Requires moving shifter back and forth multiple times to clear error (sometimes 5-6 attempts); Battery drain due to inability to fully power down; Error appears after turning vehicle off
Codes mentioned: Shift to Park warning message
Repairs/costs cited: Owners cite shifter harness replacement, transmission control switch replacement, shift assembly replacement. Costs range from $300 to $668.40 at dealerships. One owner identified the issue as a $9 wire harness. TSB available (GM Service Bulletin 19-NA-206). At least one owner had same repair done twice and issue recurred.
Recalls/TSBs owners mention: GM Service Bulletin 19-NA-206 confirms issue; GM sent TSB to at least one consumer; one owner reports Chevy told her they know about issue on 2019-2023 vehicles; issue known since 2016 on Malibu and Volt; multiple class action lawsuits filed per complaint narratives
Coolant temperature sensor/thermostat wiring interference
Engine controller throws fault codes for bad thermostat or coolant temperature sensor, but the actual root cause is a wiring harness where two wires are too close together and cause frequency interference with the sensor signal. This causes false limp-mode diagnostics and unnecessary parts replacement.
When: At 35,700 miles and earlier in vehicle ownership; happens randomly while driving
Symptoms owners cite: Check engine light illuminates; False code for faulty thermostat or coolant temp sensor; Driver assist reduced message appears; Dealer replaces thermostat and coolant sensor unnecessarily; Engine light returns after parts replaced; Reduced driver assist features such as lane keep assist and adaptive cruise control; May affect engine performance and cause safety concerns
Codes mentioned: Thermostat/coolant temp sensor fault code, P0128 (coolant thermostat malfunction), Driver assist reduced message
Repairs/costs cited: One owner had local shop separate the two wires in the harness to fix it; another owner reported spending $800+ on thermostat and sensor replacement that was unnecessary; proper fix is wire harness correction costing significantly less than parts replacement; owner at 35,000 miles had P0128 code that did not resolve after expensive repairs of coolant temperature sensor and thermostat done multiple times
Fuel system stumble and hard start after refueling
Vehicle experiences severe stumbling, jerking, loud popping sounds, and engine stall immediately after filling fuel tank to full. Engine requires prolonged cranking to restart and continues to stall at traffic lights; issue resolves after 10-15 minutes of acceleration or several hours of rest.
When: Every week when vehicle is refueled to full; occurs consistently after gas-up
Symptoms owners cite: Jerking and rough running immediately after refueling to full; Loud popping sounds from engine; Complete engine stall; Trembling and hesitation to accelerate; Starter cranks hard before engine turns over; Vehicle stalls repeatedly at traffic lights; Issue gradually subsides after 10-15 minutes of acceleration; Problem resolves completely after several hours of rest
Repairs/costs cited: Owner reports $15,000 already spent on this issue at multiple Chevy dealers and mechanics; problem continues despite extensive service; all paperwork available per owner
Electrical system total shutdown while driving
Vehicle experiences complete loss of electrical power while being driven, causing loss of steering assist, transmission control, and brake function. Engine and all electrical systems go dark and vehicle becomes inoperable mid-drive.
When: At 35,700 miles; also occurred at initial purchase in December 2019 at 0 miles
Symptoms owners cite: Complete electrical shutdown while driving; Loss of power steering assist; Transmission becomes locked; Brakes become hard/non-responsive; Vehicle stops in middle of traffic; Dashboard goes black; Vehicle locks doors with owner trapped inside; Error messages appear: SERVICE ESC, ALL WHEEL DRIVE OFF; Starter light remains GREEN during event
Codes mentioned: SERVICE ESC message, ALL WHEEL DRIVE OFF message
Repairs/costs cited: Dealership initially misdiagnosed after battery died during week-long diagnostic delay; owner was told to replace battery and starter; AC compressor also failed and required replacement; no accurate diagnostic codes obtained due to battery discharge during dealership inspection delay
Dashboard warning lights and drivetrain fault messages
Spurious warning messages and fault codes appear on instrument cluster related to engine, transmission, and drive systems without corresponding actual mechanical failures.
When: Randomly while driving; one case at 35,700 miles
Symptoms owners cite: Spurious engine and transmission fault codes displayed; SERVICE ESC warning message; ALL WHEEL DRIVE OFF warning; Drivetrain error messages with no identifiable cause; Dashboard lights coming on sporadically; Multiple simultaneous fault messages
Codes mentioned: SERVICE ESC, ALL WHEEL DRIVE OFF, Multiple engine and transmission codes
Repairs/costs cited: One owner had multiple diagnostic attempts; another owner reports On-Star sent report with 'ton of engine and transmission issues' but actual cause was shift to park electrical sensor failure
Synthesized from 35 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
My car lost power twice in the middle of heavy traffic we could have gotten killed .i was told it was a battery I bought a battery it happened again .The car goes totally black and it locks you in the vehicle you can’t get out I had to call for help scared to death
When the vehicle is in park and you try to turn it off with the start/stop button an on dash error code of ‘Shift to Park’ appears even though the vehicle is clearly in park. You are not able to turn the vehicle off. This currently is forcing me to restart the engine, put my car in reverse, shift back in drive, try re-parking and turning it off again, repeating the process until it eventually…
I recently stopped at a local store and put the car in park. A message appeared on the dash Shift to Park. I was not able to turn the car off and I had to move the gear shift back and forth until the message went off. I couldn't lock the car correctly by moving away from it. I used the key fob to eventually lock the the car. My concern is that if my wife is driving, she may not be able to lock or…
Shift into Park warning when turning vehicle off even though vehicle is in park.
Had electrical trouble with your 2019 Chevrolet Blazer?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2019 Chevrolet Blazer?
It's a documented issue but not catastrophic. 35 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2019/Chevrolet/Blazer.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.